diff --git a/homeassistant/components/bond/fan.py b/homeassistant/components/bond/fan.py
index e59d0234beb..6e33aa6d161 100644
--- a/homeassistant/components/bond/fan.py
+++ b/homeassistant/components/bond/fan.py
@@ -118,7 +118,20 @@ class BondFan(BondEntity, FanEntity):
             self._device.device_id, Action.set_speed(bond_speed)
         )
 
-    async def async_turn_on(self, speed: Optional[str] = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    async def async_turn_on(
+        self,
+        speed: Optional[str] = None,
+        percentage: Optional[int] = None,
+        preset_mode: Optional[str] = None,
+        **kwargs,
+    ) -> None:
         """Turn on the fan."""
         _LOGGER.debug("Fan async_turn_on called with speed %s", speed)
 
diff --git a/homeassistant/components/comfoconnect/fan.py b/homeassistant/components/comfoconnect/fan.py
index b5eac4f9afe..18549c52d35 100644
--- a/homeassistant/components/comfoconnect/fan.py
+++ b/homeassistant/components/comfoconnect/fan.py
@@ -102,7 +102,16 @@ class ComfoConnectFan(FanEntity):
         """List of available fan modes."""
         return [SPEED_OFF, SPEED_LOW, SPEED_MEDIUM, SPEED_HIGH]
 
-    def turn_on(self, speed: str = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    def turn_on(
+        self, speed: str = None, percentage=None, preset_mode=None, **kwargs
+    ) -> None:
         """Turn on the fan."""
         if speed is None:
             speed = SPEED_LOW
diff --git a/homeassistant/components/deconz/fan.py b/homeassistant/components/deconz/fan.py
index d92addff5bd..1ca4c8ff9c2 100644
--- a/homeassistant/components/deconz/fan.py
+++ b/homeassistant/components/deconz/fan.py
@@ -107,7 +107,20 @@ class DeconzFan(DeconzDevice, FanEntity):
 
         await self._device.set_speed(SPEEDS[speed])
 
-    async def async_turn_on(self, speed: str = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    async def async_turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
         """Turn on fan."""
         if not speed:
             speed = convert_speed(self._default_on_speed)
diff --git a/homeassistant/components/demo/fan.py b/homeassistant/components/demo/fan.py
index ee49f0a2e99..bd6661b6c2b 100644
--- a/homeassistant/components/demo/fan.py
+++ b/homeassistant/components/demo/fan.py
@@ -1,14 +1,20 @@
 """Demo fan platform that has a fake fan."""
+from typing import List, Optional
+
 from homeassistant.components.fan import (
     SPEED_HIGH,
     SPEED_LOW,
     SPEED_MEDIUM,
+    SPEED_OFF,
     SUPPORT_DIRECTION,
     SUPPORT_OSCILLATE,
+    SUPPORT_PRESET_MODE,
     SUPPORT_SET_SPEED,
     FanEntity,
 )
-from homeassistant.const import STATE_OFF
+
+PRESET_MODE_AUTO = "auto"
+PRESET_MODE_SMART = "smart"
 
 FULL_SUPPORT = SUPPORT_SET_SPEED | SUPPORT_OSCILLATE | SUPPORT_DIRECTION
 LIMITED_SUPPORT = SUPPORT_SET_SPEED
@@ -18,8 +24,55 @@ async def async_setup_platform(hass, config, async_add_entities, discovery_info=
     """Set up the demo fan platform."""
     async_add_entities(
         [
-            DemoFan(hass, "fan1", "Living Room Fan", FULL_SUPPORT),
-            DemoFan(hass, "fan2", "Ceiling Fan", LIMITED_SUPPORT),
+            # These fans implement the old model
+            DemoFan(
+                hass,
+                "fan1",
+                "Living Room Fan",
+                FULL_SUPPORT,
+                None,
+                [
+                    SPEED_OFF,
+                    SPEED_LOW,
+                    SPEED_MEDIUM,
+                    SPEED_HIGH,
+                    PRESET_MODE_AUTO,
+                    PRESET_MODE_SMART,
+                ],
+            ),
+            DemoFan(
+                hass,
+                "fan2",
+                "Ceiling Fan",
+                LIMITED_SUPPORT,
+                None,
+                [SPEED_OFF, SPEED_LOW, SPEED_MEDIUM, SPEED_HIGH],
+            ),
+            # These fans implement the newer model
+            AsyncDemoPercentageFan(
+                hass,
+                "fan3",
+                "Percentage Full Fan",
+                FULL_SUPPORT,
+                [PRESET_MODE_AUTO, PRESET_MODE_SMART],
+                None,
+            ),
+            DemoPercentageFan(
+                hass,
+                "fan4",
+                "Percentage Limited Fan",
+                LIMITED_SUPPORT,
+                [PRESET_MODE_AUTO, PRESET_MODE_SMART],
+                None,
+            ),
+            AsyncDemoPercentageFan(
+                hass,
+                "fan5",
+                "Preset Only Limited Fan",
+                SUPPORT_PRESET_MODE,
+                [PRESET_MODE_AUTO, PRESET_MODE_SMART],
+                [],
+            ),
         ]
     )
 
@@ -29,21 +82,30 @@ async def async_setup_entry(hass, config_entry, async_add_entities):
     await async_setup_platform(hass, {}, async_add_entities)
 
 
-class DemoFan(FanEntity):
-    """A demonstration fan component."""
+class BaseDemoFan(FanEntity):
+    """A demonstration fan component that uses legacy fan speeds."""
 
     def __init__(
-        self, hass, unique_id: str, name: str, supported_features: int
+        self,
+        hass,
+        unique_id: str,
+        name: str,
+        supported_features: int,
+        preset_modes: Optional[List[str]],
+        speed_list: Optional[List[str]],
     ) -> None:
         """Initialize the entity."""
         self.hass = hass
         self._unique_id = unique_id
         self._supported_features = supported_features
-        self._speed = STATE_OFF
+        self._speed = SPEED_OFF
+        self._percentage = 0
+        self._speed_list = speed_list
+        self._preset_modes = preset_modes
+        self._preset_mode = None
         self._oscillating = None
         self._direction = None
         self._name = name
-
         if supported_features & SUPPORT_OSCILLATE:
             self._oscillating = False
         if supported_features & SUPPORT_DIRECTION:
@@ -64,17 +126,42 @@ class DemoFan(FanEntity):
         """No polling needed for a demo fan."""
         return False
 
+    @property
+    def current_direction(self) -> str:
+        """Fan direction."""
+        return self._direction
+
+    @property
+    def oscillating(self) -> bool:
+        """Oscillating."""
+        return self._oscillating
+
+    @property
+    def supported_features(self) -> int:
+        """Flag supported features."""
+        return self._supported_features
+
+
+class DemoFan(BaseDemoFan, FanEntity):
+    """A demonstration fan component that uses legacy fan speeds."""
+
     @property
     def speed(self) -> str:
         """Return the current speed."""
         return self._speed
 
     @property
-    def speed_list(self) -> list:
-        """Get the list of available speeds."""
-        return [STATE_OFF, SPEED_LOW, SPEED_MEDIUM, SPEED_HIGH]
+    def speed_list(self):
+        """Return the speed list."""
+        return self._speed_list
 
-    def turn_on(self, speed: str = None, **kwargs) -> None:
+    def turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
         """Turn on the entity."""
         if speed is None:
             speed = SPEED_MEDIUM
@@ -83,7 +170,7 @@ class DemoFan(FanEntity):
     def turn_off(self, **kwargs) -> None:
         """Turn off the entity."""
         self.oscillate(False)
-        self.set_speed(STATE_OFF)
+        self.set_speed(SPEED_OFF)
 
     def set_speed(self, speed: str) -> None:
         """Set the speed of the fan."""
@@ -100,17 +187,124 @@ class DemoFan(FanEntity):
         self._oscillating = oscillating
         self.schedule_update_ha_state()
 
-    @property
-    def current_direction(self) -> str:
-        """Fan direction."""
-        return self._direction
+
+class DemoPercentageFan(BaseDemoFan, FanEntity):
+    """A demonstration fan component that uses percentages."""
 
     @property
-    def oscillating(self) -> bool:
-        """Oscillating."""
-        return self._oscillating
+    def percentage(self) -> str:
+        """Return the current speed."""
+        return self._percentage
+
+    def set_percentage(self, percentage: int) -> None:
+        """Set the speed of the fan, as a percentage."""
+        self._percentage = percentage
+        self._preset_mode = None
+        self.schedule_update_ha_state()
 
     @property
-    def supported_features(self) -> int:
-        """Flag supported features."""
-        return self._supported_features
+    def preset_mode(self) -> Optional[str]:
+        """Return the current preset mode, e.g., auto, smart, interval, favorite."""
+        return self._preset_mode
+
+    @property
+    def preset_modes(self) -> Optional[List[str]]:
+        """Return a list of available preset modes."""
+        return self._preset_modes
+
+    def set_preset_mode(self, preset_mode: str) -> None:
+        """Set new preset mode."""
+        if preset_mode in self.preset_modes:
+            self._preset_mode = preset_mode
+            self._percentage = None
+            self.schedule_update_ha_state()
+        else:
+            raise ValueError(f"Invalid preset mode: {preset_mode}")
+
+    def turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
+        """Turn on the entity."""
+        if preset_mode:
+            self.set_preset_mode(preset_mode)
+            return
+
+        if percentage is None:
+            percentage = 67
+
+        self.set_percentage(percentage)
+
+    def turn_off(self, **kwargs) -> None:
+        """Turn off the entity."""
+        self.set_percentage(0)
+
+
+class AsyncDemoPercentageFan(BaseDemoFan, FanEntity):
+    """An async demonstration fan component that uses percentages."""
+
+    @property
+    def percentage(self) -> str:
+        """Return the current speed."""
+        return self._percentage
+
+    async def async_set_percentage(self, percentage: int) -> None:
+        """Set the speed of the fan, as a percentage."""
+        self._percentage = percentage
+        self._preset_mode = None
+        self.async_write_ha_state()
+
+    @property
+    def preset_mode(self) -> Optional[str]:
+        """Return the current preset mode, e.g., auto, smart, interval, favorite."""
+        return self._preset_mode
+
+    @property
+    def preset_modes(self) -> Optional[List[str]]:
+        """Return a list of available preset modes."""
+        return self._preset_modes
+
+    async def async_set_preset_mode(self, preset_mode: str) -> None:
+        """Set new preset mode."""
+        if preset_mode not in self.preset_modes:
+            raise ValueError(
+                "{preset_mode} is not a valid preset_mode: {self.preset_modes}"
+            )
+        self._preset_mode = preset_mode
+        self._percentage = None
+        self.async_write_ha_state()
+
+    async def async_turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
+        """Turn on the entity."""
+        if preset_mode:
+            await self.async_set_preset_mode(preset_mode)
+            return
+
+        if percentage is None:
+            percentage = 67
+
+        await self.async_set_percentage(percentage)
+
+    async def async_turn_off(self, **kwargs) -> None:
+        """Turn off the entity."""
+        await self.async_oscillate(False)
+        await self.async_set_percentage(0)
+
+    async def async_set_direction(self, direction: str) -> None:
+        """Set the direction of the fan."""
+        self._direction = direction
+        self.async_write_ha_state()
+
+    async def async_oscillate(self, oscillating: bool) -> None:
+        """Set oscillation."""
+        self._oscillating = oscillating
+        self.async_write_ha_state()
diff --git a/homeassistant/components/dyson/fan.py b/homeassistant/components/dyson/fan.py
index 6690f77390d..7a57a75523e 100644
--- a/homeassistant/components/dyson/fan.py
+++ b/homeassistant/components/dyson/fan.py
@@ -233,7 +233,20 @@ class DysonPureCoolLinkEntity(DysonFanEntity):
         """Initialize the fan."""
         super().__init__(device, DysonPureCoolState)
 
-    def turn_on(self, speed: Optional[str] = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    def turn_on(
+        self,
+        speed: Optional[str] = None,
+        percentage: Optional[int] = None,
+        preset_mode: Optional[str] = None,
+        **kwargs,
+    ) -> None:
         """Turn on the fan."""
         _LOGGER.debug("Turn on fan %s with speed %s", self.name, speed)
         if speed is not None:
@@ -299,7 +312,20 @@ class DysonPureCoolEntity(DysonFanEntity):
         """Initialize the fan."""
         super().__init__(device, DysonPureCoolV2State)
 
-    def turn_on(self, speed: Optional[str] = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    def turn_on(
+        self,
+        speed: Optional[str] = None,
+        percentage: Optional[int] = None,
+        preset_mode: Optional[str] = None,
+        **kwargs,
+    ) -> None:
         """Turn on the fan."""
         _LOGGER.debug("Turn on fan %s", self.name)
 
diff --git a/homeassistant/components/esphome/fan.py b/homeassistant/components/esphome/fan.py
index 32f445d23a2..c7abac576e7 100644
--- a/homeassistant/components/esphome/fan.py
+++ b/homeassistant/components/esphome/fan.py
@@ -79,7 +79,20 @@ class EsphomeFan(EsphomeEntity, FanEntity):
             self._static_info.key, speed=_fan_speeds.from_hass(speed)
         )
 
-    async def async_turn_on(self, speed: Optional[str] = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    async def async_turn_on(
+        self,
+        speed: Optional[str] = None,
+        percentage: Optional[int] = None,
+        preset_mode: Optional[str] = None,
+        **kwargs,
+    ) -> None:
         """Turn on the fan."""
         if speed == SPEED_OFF:
             await self.async_turn_off()
diff --git a/homeassistant/components/fan/__init__.py b/homeassistant/components/fan/__init__.py
index 90a3d030703..7b6b083c964 100644
--- a/homeassistant/components/fan/__init__.py
+++ b/homeassistant/components/fan/__init__.py
@@ -2,7 +2,7 @@
 from datetime import timedelta
 import functools as ft
 import logging
-from typing import Optional
+from typing import List, Optional
 
 import voluptuous as vol
 
@@ -20,6 +20,10 @@ from homeassistant.helpers.config_validation import (  # noqa: F401
 from homeassistant.helpers.entity import ToggleEntity
 from homeassistant.helpers.entity_component import EntityComponent
 from homeassistant.loader import bind_hass
+from homeassistant.util.percentage import (
+    ordered_list_item_to_percentage,
+    percentage_to_ordered_list_item,
+)
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -32,10 +36,13 @@ ENTITY_ID_FORMAT = DOMAIN + ".{}"
 SUPPORT_SET_SPEED = 1
 SUPPORT_OSCILLATE = 2
 SUPPORT_DIRECTION = 4
+SUPPORT_PRESET_MODE = 8
 
 SERVICE_SET_SPEED = "set_speed"
 SERVICE_OSCILLATE = "oscillate"
 SERVICE_SET_DIRECTION = "set_direction"
+SERVICE_SET_PERCENTAGE = "set_percentage"
+SERVICE_SET_PRESET_MODE = "set_preset_mode"
 
 SPEED_OFF = "off"
 SPEED_LOW = "low"
@@ -46,9 +53,47 @@ DIRECTION_FORWARD = "forward"
 DIRECTION_REVERSE = "reverse"
 
 ATTR_SPEED = "speed"
+ATTR_PERCENTAGE = "percentage"
 ATTR_SPEED_LIST = "speed_list"
 ATTR_OSCILLATING = "oscillating"
 ATTR_DIRECTION = "direction"
+ATTR_PRESET_MODE = "preset_mode"
+ATTR_PRESET_MODES = "preset_modes"
+
+# Invalid speeds do not conform to the entity model, but have crept
+# into core integrations at some point so we are temporarily
+# accommodating them in the transition to percentages.
+_NOT_SPEED_OFF = "off"
+_NOT_SPEED_AUTO = "auto"
+_NOT_SPEED_SMART = "smart"
+_NOT_SPEED_INTERVAL = "interval"
+_NOT_SPEED_IDLE = "idle"
+_NOT_SPEED_FAVORITE = "favorite"
+
+_NOT_SPEEDS_FILTER = {
+    _NOT_SPEED_OFF,
+    _NOT_SPEED_AUTO,
+    _NOT_SPEED_SMART,
+    _NOT_SPEED_INTERVAL,
+    _NOT_SPEED_IDLE,
+    _NOT_SPEED_FAVORITE,
+}
+
+_FAN_NATIVE = "_fan_native"
+
+OFF_SPEED_VALUES = [SPEED_OFF, None]
+
+
+class NoValidSpeedsError(ValueError):
+    """Exception class when there are no valid speeds."""
+
+
+class NotValidSpeedError(ValueError):
+    """Exception class when the speed in not in the speed list."""
+
+
+class NotValidPresetModeError(ValueError):
+    """Exception class when the preset_mode in not in the preset_modes list."""
 
 
 @bind_hass
@@ -56,7 +101,7 @@ def is_on(hass, entity_id: str) -> bool:
     """Return if the fans are on based on the statemachine."""
     state = hass.states.get(entity_id)
     if ATTR_SPEED in state.attributes:
-        return state.attributes[ATTR_SPEED] not in [SPEED_OFF, None]
+        return state.attributes[ATTR_SPEED] not in OFF_SPEED_VALUES
     return state.state == STATE_ON
 
 
@@ -68,15 +113,27 @@ async def async_setup(hass, config: dict):
 
     await component.async_setup(config)
 
+    # After the transition to percentage and preset_modes concludes,
+    # switch this back to async_turn_on and remove async_turn_on_compat
     component.async_register_entity_service(
-        SERVICE_TURN_ON, {vol.Optional(ATTR_SPEED): cv.string}, "async_turn_on"
+        SERVICE_TURN_ON,
+        {
+            vol.Optional(ATTR_SPEED): cv.string,
+            vol.Optional(ATTR_PERCENTAGE): vol.All(
+                vol.Coerce(int), vol.Range(min=0, max=100)
+            ),
+            vol.Optional(ATTR_PRESET_MODE): cv.string,
+        },
+        "async_turn_on_compat",
     )
     component.async_register_entity_service(SERVICE_TURN_OFF, {}, "async_turn_off")
     component.async_register_entity_service(SERVICE_TOGGLE, {}, "async_toggle")
+    # After the transition to percentage and preset_modes concludes,
+    # remove this service
     component.async_register_entity_service(
         SERVICE_SET_SPEED,
         {vol.Required(ATTR_SPEED): cv.string},
-        "async_set_speed",
+        "async_set_speed_deprecated",
         [SUPPORT_SET_SPEED],
     )
     component.async_register_entity_service(
@@ -91,6 +148,22 @@ async def async_setup(hass, config: dict):
         "async_set_direction",
         [SUPPORT_DIRECTION],
     )
+    component.async_register_entity_service(
+        SERVICE_SET_PERCENTAGE,
+        {
+            vol.Required(ATTR_PERCENTAGE): vol.All(
+                vol.Coerce(int), vol.Range(min=0, max=100)
+            )
+        },
+        "async_set_percentage",
+        [SUPPORT_SET_SPEED],
+    )
+    component.async_register_entity_service(
+        SERVICE_SET_PRESET_MODE,
+        {vol.Required(ATTR_PRESET_MODE): cv.string},
+        "async_set_preset_mode",
+        [SUPPORT_SET_SPEED, SUPPORT_PRESET_MODE],
+    )
 
     return True
 
@@ -105,19 +178,91 @@ async def async_unload_entry(hass, entry):
     return await hass.data[DOMAIN].async_unload_entry(entry)
 
 
+def _fan_native(method):
+    """Native fan method not overridden."""
+    setattr(method, _FAN_NATIVE, True)
+    return method
+
+
 class FanEntity(ToggleEntity):
     """Representation of a fan."""
 
+    @_fan_native
     def set_speed(self, speed: str) -> None:
         """Set the speed of the fan."""
         raise NotImplementedError()
 
+    async def async_set_speed_deprecated(self, speed: str):
+        """Set the speed of the fan."""
+        _LOGGER.warning(
+            "fan.set_speed is deprecated, use fan.set_percentage or fan.set_preset_mode instead."
+        )
+        await self.async_set_speed(speed)
+
+    @_fan_native
     async def async_set_speed(self, speed: str):
         """Set the speed of the fan."""
         if speed == SPEED_OFF:
             await self.async_turn_off()
+            return
+
+        if speed in self.preset_modes:
+            if not hasattr(self.async_set_preset_mode, _FAN_NATIVE):
+                await self.async_set_preset_mode(speed)
+                return
+            if not hasattr(self.set_preset_mode, _FAN_NATIVE):
+                await self.hass.async_add_executor_job(self.set_preset_mode, speed)
+                return
         else:
-            await self.hass.async_add_executor_job(self.set_speed, speed)
+            if not hasattr(self.async_set_percentage, _FAN_NATIVE):
+                await self.async_set_percentage(self.speed_to_percentage(speed))
+                return
+            if not hasattr(self.set_percentage, _FAN_NATIVE):
+                await self.hass.async_add_executor_job(
+                    self.set_percentage, self.speed_to_percentage(speed)
+                )
+                return
+
+        await self.hass.async_add_executor_job(self.set_speed, speed)
+
+    @_fan_native
+    def set_percentage(self, percentage: int) -> None:
+        """Set the speed of the fan, as a percentage."""
+        raise NotImplementedError()
+
+    @_fan_native
+    async def async_set_percentage(self, percentage: int) -> None:
+        """Set the speed of the fan, as a percentage."""
+        if percentage == 0:
+            await self.async_turn_off()
+        elif not hasattr(self.set_percentage, _FAN_NATIVE):
+            await self.hass.async_add_executor_job(self.set_percentage, percentage)
+        else:
+            await self.async_set_speed(self.percentage_to_speed(percentage))
+
+    @_fan_native
+    def set_preset_mode(self, preset_mode: str) -> None:
+        """Set new preset mode."""
+        self._valid_preset_mode_or_raise(preset_mode)
+        self.set_speed(preset_mode)
+
+    @_fan_native
+    async def async_set_preset_mode(self, preset_mode: str) -> None:
+        """Set new preset mode."""
+        if not hasattr(self.set_preset_mode, _FAN_NATIVE):
+            await self.hass.async_add_executor_job(self.set_preset_mode, preset_mode)
+            return
+
+        self._valid_preset_mode_or_raise(preset_mode)
+        await self.async_set_speed(preset_mode)
+
+    def _valid_preset_mode_or_raise(self, preset_mode):
+        """Raise NotValidPresetModeError on invalid preset_mode."""
+        preset_modes = self.preset_modes
+        if preset_mode not in preset_modes:
+            raise NotValidPresetModeError(
+                f"The preset_mode {preset_mode} is not a valid preset_mode: {preset_modes}"
+            )
 
     def set_direction(self, direction: str) -> None:
         """Set the direction of the fan."""
@@ -128,18 +273,75 @@ class FanEntity(ToggleEntity):
         await self.hass.async_add_executor_job(self.set_direction, direction)
 
     # pylint: disable=arguments-differ
-    def turn_on(self, speed: Optional[str] = None, **kwargs) -> None:
+    def turn_on(
+        self,
+        speed: Optional[str] = None,
+        percentage: Optional[int] = None,
+        preset_mode: Optional[str] = None,
+        **kwargs,
+    ) -> None:
         """Turn on the fan."""
         raise NotImplementedError()
 
     # pylint: disable=arguments-differ
-    async def async_turn_on(self, speed: Optional[str] = None, **kwargs):
+    async def async_turn_on_compat(
+        self,
+        speed: Optional[str] = None,
+        percentage: Optional[int] = None,
+        preset_mode: Optional[str] = None,
+        **kwargs,
+    ) -> None:
+        """Turn on the fan.
+
+        This _compat version wraps async_turn_on with
+        backwards and forward compatibility.
+
+        After the transition to percentage and preset_modes concludes, it
+        should be removed.
+        """
+        if preset_mode is not None:
+            self._valid_preset_mode_or_raise(preset_mode)
+            speed = preset_mode
+            percentage = None
+        elif speed is not None:
+            _LOGGER.warning(
+                "Calling fan.turn_on with the speed argument is deprecated, use percentage or preset_mode instead."
+            )
+            if speed in self.preset_modes:
+                preset_mode = speed
+                percentage = None
+            else:
+                percentage = self.speed_to_percentage(speed)
+        elif percentage is not None:
+            speed = self.percentage_to_speed(percentage)
+
+        await self.async_turn_on(
+            speed=speed,
+            percentage=percentage,
+            preset_mode=preset_mode,
+            **kwargs,
+        )
+
+    # pylint: disable=arguments-differ
+    async def async_turn_on(
+        self,
+        speed: Optional[str] = None,
+        percentage: Optional[int] = None,
+        preset_mode: Optional[str] = None,
+        **kwargs,
+    ) -> None:
         """Turn on the fan."""
         if speed == SPEED_OFF:
             await self.async_turn_off()
         else:
             await self.hass.async_add_executor_job(
-                ft.partial(self.turn_on, speed, **kwargs)
+                ft.partial(
+                    self.turn_on,
+                    speed=speed,
+                    percentage=percentage,
+                    preset_mode=preset_mode,
+                    **kwargs,
+                )
             )
 
     def oscillate(self, oscillating: bool) -> None:
@@ -155,15 +357,57 @@ class FanEntity(ToggleEntity):
         """Return true if the entity is on."""
         return self.speed not in [SPEED_OFF, None]
 
+    @property
+    def _implemented_percentage(self):
+        """Return true if percentage has been implemented."""
+        return not hasattr(self.set_percentage, _FAN_NATIVE) or not hasattr(
+            self.async_set_percentage, _FAN_NATIVE
+        )
+
+    @property
+    def _implemented_preset_mode(self):
+        """Return true if preset_mode has been implemented."""
+        return not hasattr(self.set_preset_mode, _FAN_NATIVE) or not hasattr(
+            self.async_set_preset_mode, _FAN_NATIVE
+        )
+
+    @property
+    def _implemented_speed(self):
+        """Return true if speed has been implemented."""
+        return not hasattr(self.set_speed, _FAN_NATIVE) or not hasattr(
+            self.async_set_speed, _FAN_NATIVE
+        )
+
     @property
     def speed(self) -> Optional[str]:
         """Return the current speed."""
+        if self._implemented_preset_mode:
+            preset_mode = self.preset_mode
+            if preset_mode:
+                return preset_mode
+        if self._implemented_percentage:
+            return self.percentage_to_speed(self.percentage)
         return None
 
+    @property
+    def percentage(self) -> Optional[int]:
+        """Return the current speed as a percentage."""
+        if not self._implemented_preset_mode:
+            if self.speed in self.preset_modes:
+                return None
+        if not self._implemented_percentage:
+            return self.speed_to_percentage(self.speed)
+        return 0
+
     @property
     def speed_list(self) -> list:
         """Get the list of available speeds."""
-        return []
+        speeds = []
+        if self._implemented_percentage:
+            speeds += [SPEED_OFF, SPEED_LOW, SPEED_MEDIUM, SPEED_HIGH]
+        if self._implemented_preset_mode:
+            speeds += self.preset_modes
+        return speeds
 
     @property
     def current_direction(self) -> Optional[str]:
@@ -178,9 +422,79 @@ class FanEntity(ToggleEntity):
     @property
     def capability_attributes(self):
         """Return capability attributes."""
+        attrs = {}
         if self.supported_features & SUPPORT_SET_SPEED:
-            return {ATTR_SPEED_LIST: self.speed_list}
-        return {}
+            attrs[ATTR_SPEED_LIST] = self.speed_list
+
+        if (
+            self.supported_features & SUPPORT_SET_SPEED
+            or self.supported_features & SUPPORT_PRESET_MODE
+        ):
+            attrs[ATTR_PRESET_MODES] = self.preset_modes
+
+        return attrs
+
+    def speed_to_percentage(self, speed: str) -> int:
+        """
+        Map a speed to a percentage.
+
+        Officially this should only have to deal with the 4 pre-defined speeds:
+
+        return {
+            SPEED_OFF: 0,
+            SPEED_LOW: 33,
+            SPEED_MEDIUM: 66,
+            SPEED_HIGH: 100,
+        }[speed]
+
+        Unfortunately lots of fans make up their own speeds. So the default
+        mapping is more dynamic.
+        """
+        if speed in OFF_SPEED_VALUES:
+            return 0
+
+        speed_list = speed_list_without_preset_modes(self.speed_list)
+
+        if speed_list and speed not in speed_list:
+            raise NotValidSpeedError(f"The speed {speed} is not a valid speed.")
+
+        try:
+            return ordered_list_item_to_percentage(speed_list, speed)
+        except ValueError as ex:
+            raise NoValidSpeedsError(
+                f"The speed_list {speed_list} does not contain any valid speeds."
+            ) from ex
+
+    def percentage_to_speed(self, percentage: int) -> str:
+        """
+        Map a percentage onto self.speed_list.
+
+        Officially, this should only have to deal with 4 pre-defined speeds.
+
+        if value == 0:
+            return SPEED_OFF
+        elif value <= 33:
+            return SPEED_LOW
+        elif value <= 66:
+            return SPEED_MEDIUM
+        else:
+            return SPEED_HIGH
+
+        Unfortunately there is currently a high degree of non-conformancy.
+        Until fans have been corrected a more complicated and dynamic
+        mapping is used.
+        """
+        if percentage == 0:
+            return SPEED_OFF
+
+        speed_list = speed_list_without_preset_modes(self.speed_list)
+
+        try:
+            return percentage_to_ordered_list_item(speed_list, percentage)
+        except ValueError as ex:
+            raise NoValidSpeedsError(
+                f"The speed_list {speed_list} does not contain any valid speeds."
+            ) from ex
 
     @property
     def state_attributes(self) -> dict:
@@ -196,6 +510,13 @@ class FanEntity(ToggleEntity):
 
         if supported_features & SUPPORT_SET_SPEED:
             data[ATTR_SPEED] = self.speed
+            data[ATTR_PERCENTAGE] = self.percentage
+
+        if (
+            supported_features & SUPPORT_PRESET_MODE
+            or supported_features & SUPPORT_SET_SPEED
+        ):
+            data[ATTR_PRESET_MODE] = self.preset_mode
 
         return data
 
@@ -203,3 +524,72 @@ class FanEntity(ToggleEntity):
     def supported_features(self) -> int:
         """Flag supported features."""
         return 0
+
+    @property
+    def preset_mode(self) -> Optional[str]:
+        """Return the current preset mode, e.g., auto, smart, interval, favorite.
+
+        Requires SUPPORT_SET_SPEED.
+        """
+        speed = self.speed
+        if speed in self.preset_modes:
+            return speed
+        return None
+
+    @property
+    def preset_modes(self) -> Optional[List[str]]:
+        """Return a list of available preset modes.
+
+        Requires SUPPORT_SET_SPEED.
+        """
+        return preset_modes_from_speed_list(self.speed_list)
+
+
+def speed_list_without_preset_modes(speed_list: List):
+    """Filter out non-speeds from the speed list.
+
+    The goal is to get the speeds in a list from lowest to
+    highest by removing speeds that are not valid or out of order
+    so we can map them to percentages.
+
+    Examples:
+      input: ["off", "low", "low-medium", "medium", "medium-high", "high", "auto"]
+      output: ["low", "low-medium", "medium", "medium-high", "high"]
+
+      input: ["off", "auto", "low", "medium", "high"]
+      output: ["low", "medium", "high"]
+
+      input: ["off", "1", "2", "3", "4", "5", "6", "7", "smart"]
+      output: ["1", "2", "3", "4", "5", "6", "7"]
+
+      input: ["Auto", "Silent", "Favorite", "Idle", "Medium", "High", "Strong"]
+      output: ["Silent", "Medium", "High", "Strong"]
+    """
+
+    return [speed for speed in speed_list if speed.lower() not in _NOT_SPEEDS_FILTER]
+
+
+def preset_modes_from_speed_list(speed_list: List):
+    """Filter out non-preset modes from the speed list.
+
+    The goal is to return only preset modes.
+
+    Examples:
+      input: ["off", "low", "low-medium", "medium", "medium-high", "high", "auto"]
+      output: ["auto"]
+
+      input: ["off", "auto", "low", "medium", "high"]
+      output: ["auto"]
+
+      input: ["off", "1", "2", "3", "4", "5", "6", "7", "smart"]
+      output: ["smart"]
+
+      input: ["Auto", "Silent", "Favorite", "Idle", "Medium", "High", "Strong"]
+      output: ["Auto", "Favorite", "Idle"]
+    """
+
+    return [
+        speed
+        for speed in speed_list
+        if speed.lower() in _NOT_SPEEDS_FILTER and speed.lower() != SPEED_OFF
+    ]
diff --git a/homeassistant/components/fan/reproduce_state.py b/homeassistant/components/fan/reproduce_state.py
index 55ae78d90f6..b5f0fca47b7 100644
--- a/homeassistant/components/fan/reproduce_state.py
+++ b/homeassistant/components/fan/reproduce_state.py
@@ -17,10 +17,14 @@ from homeassistant.helpers.typing import HomeAssistantType
 from . import (
     ATTR_DIRECTION,
     ATTR_OSCILLATING,
+    ATTR_PERCENTAGE,
+    ATTR_PRESET_MODE,
     ATTR_SPEED,
     DOMAIN,
     SERVICE_OSCILLATE,
     SERVICE_SET_DIRECTION,
+    SERVICE_SET_PERCENTAGE,
+    SERVICE_SET_PRESET_MODE,
     SERVICE_SET_SPEED,
 )
 
@@ -31,6 +35,8 @@ ATTRIBUTES = {  # attribute: service
     ATTR_DIRECTION: SERVICE_SET_DIRECTION,
     ATTR_OSCILLATING: SERVICE_OSCILLATE,
     ATTR_SPEED: SERVICE_SET_SPEED,
+    ATTR_PERCENTAGE: SERVICE_SET_PERCENTAGE,
+    ATTR_PRESET_MODE: SERVICE_SET_PRESET_MODE,
 }
 
 
diff --git a/homeassistant/components/fan/services.yaml b/homeassistant/components/fan/services.yaml
index 1fb88a36d2c..760aaabcf4a 100644
--- a/homeassistant/components/fan/services.yaml
+++ b/homeassistant/components/fan/services.yaml
@@ -9,6 +9,26 @@ set_speed:
       description: Speed setting
       example: "low"
 
+set_preset_mode:
+  description: Set preset mode for a fan device.
+  fields:
+    entity_id:
+      description: Name(s) of entities to change.
+      example: "fan.kitchen"
+    preset_mode:
+      description: New value of preset mode
+      example: "auto"
+
+set_percentage:
+  description: Sets fan speed percentage.
+  fields:
+    entity_id:
+      description: Name(s) of the entities to set
+      example: "fan.living_room"
+    percentage:
+      description: Percentage speed setting
+      example: 25
+
 turn_on:
   description: Turns fan on.
   fields:
@@ -18,6 +38,12 @@ turn_on:
     speed:
       description: Speed setting
       example: "high"
+    percentage:
+      description: Percentage speed setting
+      example: 75
+    preset_mode:
+      description: Preset mode setting
+      example: "auto"
 
 turn_off:
   description: Turns fan off.
diff --git a/homeassistant/components/homekit_controller/fan.py b/homeassistant/components/homekit_controller/fan.py
index 476d0f2c8e5..828347e4b89 100644
--- a/homeassistant/components/homekit_controller/fan.py
+++ b/homeassistant/components/homekit_controller/fan.py
@@ -130,9 +130,17 @@ class BaseHomeKitFan(HomeKitEntity, FanEntity):
             {CharacteristicsTypes.SWING_MODE: 1 if oscillating else 0}
         )
 
-    async def async_turn_on(self, speed=None, **kwargs):
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    async def async_turn_on(
+        self, speed=None, percentage=None, preset_mode=None, **kwargs
+    ):
         """Turn the specified fan on."""
-
         characteristics = {}
 
         if not self.is_on:
diff --git a/homeassistant/components/insteon/fan.py b/homeassistant/components/insteon/fan.py
index fb741d7a4b0..f9d1c381f49 100644
--- a/homeassistant/components/insteon/fan.py
+++ b/homeassistant/components/insteon/fan.py
@@ -63,7 +63,20 @@ class InsteonFanEntity(InsteonEntity, FanEntity):
         """Flag supported features."""
         return SUPPORT_SET_SPEED
 
-    async def async_turn_on(self, speed: str = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    async def async_turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
         """Turn on the fan."""
         if speed is None:
             speed = SPEED_MEDIUM
diff --git a/homeassistant/components/isy994/fan.py b/homeassistant/components/isy994/fan.py
index 384ff22403a..c94c2f607bd 100644
--- a/homeassistant/components/isy994/fan.py
+++ b/homeassistant/components/isy994/fan.py
@@ -71,7 +71,20 @@ class ISYFanEntity(ISYNodeEntity, FanEntity):
         """Send the set speed command to the ISY994 fan device."""
         self._node.turn_on(val=STATE_TO_VALUE.get(speed, 255))
 
-    def turn_on(self, speed: str = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    def turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
         """Send the turn on command to the ISY994 fan device."""
         self.set_speed(speed)
 
@@ -108,7 +121,20 @@ class ISYFanProgramEntity(ISYProgramEntity, FanEntity):
         if not self._actions.run_then():
             _LOGGER.error("Unable to turn off the fan")
 
-    def turn_on(self, speed: str = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    def turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
         """Send the turn off command to ISY994 fan program."""
         if not self._actions.run_else():
             _LOGGER.error("Unable to turn on the fan")
diff --git a/homeassistant/components/lutron_caseta/fan.py b/homeassistant/components/lutron_caseta/fan.py
index 045cd35cd17..80472535d51 100644
--- a/homeassistant/components/lutron_caseta/fan.py
+++ b/homeassistant/components/lutron_caseta/fan.py
@@ -75,7 +75,20 @@ class LutronCasetaFan(LutronCasetaDevice, FanEntity):
         """Flag supported features. Speed Only."""
         return SUPPORT_SET_SPEED
 
-    async def async_turn_on(self, speed: str = None, **kwargs):
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    async def async_turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ):
         """Turn the fan on."""
         if speed is None:
             speed = SPEED_MEDIUM
diff --git a/homeassistant/components/mqtt/fan.py b/homeassistant/components/mqtt/fan.py
index e5cebd43714..f96180b0982 100644
--- a/homeassistant/components/mqtt/fan.py
+++ b/homeassistant/components/mqtt/fan.py
@@ -317,7 +317,20 @@ class MqttFan(MqttEntity, FanEntity):
         """Return the oscillation state."""
         return self._oscillation
 
-    async def async_turn_on(self, speed: str = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    async def async_turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
         """Turn on the entity.
 
         This method is a coroutine.
diff --git a/homeassistant/components/ozw/fan.py b/homeassistant/components/ozw/fan.py
index 818bd710496..5043379303f 100644
--- a/homeassistant/components/ozw/fan.py
+++ b/homeassistant/components/ozw/fan.py
@@ -57,7 +57,16 @@ class ZwaveFan(ZWaveDeviceEntity, FanEntity):
         self._previous_speed = speed
         self.values.primary.send_value(SPEED_TO_VALUE[speed])
 
-    async def async_turn_on(self, speed=None, **kwargs):
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    async def async_turn_on(
+        self, speed=None, percentage=None, preset_mode=None, **kwargs
+    ):
         """Turn the device on."""
         if speed is None:
             # Value 255 tells device to return to previous value
diff --git a/homeassistant/components/smartthings/fan.py b/homeassistant/components/smartthings/fan.py
index e366f6bb3e3..bff9862c8f6 100644
--- a/homeassistant/components/smartthings/fan.py
+++ b/homeassistant/components/smartthings/fan.py
@@ -50,7 +50,20 @@ class SmartThingsFan(SmartThingsEntity, FanEntity):
         # the entity state ahead of receiving the confirming push updates
         self.async_write_ha_state()
 
-    async def async_turn_on(self, speed: str = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    async def async_turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
         """Turn the fan on."""
         if speed is not None:
             value = SPEED_TO_VALUE[speed]
diff --git a/homeassistant/components/smarty/fan.py b/homeassistant/components/smarty/fan.py
index e46198b051b..40c244944ce 100644
--- a/homeassistant/components/smarty/fan.py
+++ b/homeassistant/components/smarty/fan.py
@@ -86,7 +86,14 @@ class SmartyFan(FanEntity):
             self._speed = speed
             self._state = True
 
-    def turn_on(self, speed=None, **kwargs):
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    def turn_on(self, speed=None, percentage=None, preset_mode=None, **kwargs):
         """Turn on the fan."""
         _LOGGER.debug("Turning on fan. Speed is %s", speed)
         if speed is None:
diff --git a/homeassistant/components/tasmota/fan.py b/homeassistant/components/tasmota/fan.py
index bdcc00dc764..1d7aa9f38cb 100644
--- a/homeassistant/components/tasmota/fan.py
+++ b/homeassistant/components/tasmota/fan.py
@@ -79,7 +79,16 @@ class TasmotaFan(
         else:
             self._tasmota_entity.set_speed(HA_TO_TASMOTA_SPEED_MAP[speed])
 
-    async def async_turn_on(self, speed=None, **kwargs):
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    async def async_turn_on(
+        self, speed=None, percentage=None, preset_mode=None, **kwargs
+    ):
         """Turn the fan on."""
         # Tasmota does not support turning a fan on with implicit speed
         await self.async_set_speed(speed or fan.SPEED_MEDIUM)
diff --git a/homeassistant/components/template/fan.py b/homeassistant/components/template/fan.py
index fa67f60dac0..fe32d095677 100644
--- a/homeassistant/components/template/fan.py
+++ b/homeassistant/components/template/fan.py
@@ -251,8 +251,20 @@ class TemplateFan(TemplateEntity, FanEntity):
         """Return the oscillation state."""
         return self._direction
 
-    # pylint: disable=arguments-differ
-    async def async_turn_on(self, speed: str = None) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    async def async_turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
         """Turn on the fan."""
         await self._on_script.async_run({ATTR_SPEED: speed}, context=self._context)
         self._state = STATE_ON
diff --git a/homeassistant/components/tuya/fan.py b/homeassistant/components/tuya/fan.py
index e88349cf795..a66e1ff92a4 100644
--- a/homeassistant/components/tuya/fan.py
+++ b/homeassistant/components/tuya/fan.py
@@ -75,7 +75,20 @@ class TuyaFanDevice(TuyaDevice, FanEntity):
         else:
             self._tuya.set_speed(speed)
 
-    def turn_on(self, speed: str = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    def turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
         """Turn on the fan."""
         if speed is not None:
             self.set_speed(speed)
diff --git a/homeassistant/components/vallox/fan.py b/homeassistant/components/vallox/fan.py
index c79ee15db59..525bf00f50e 100644
--- a/homeassistant/components/vallox/fan.py
+++ b/homeassistant/components/vallox/fan.py
@@ -137,7 +137,20 @@ class ValloxFan(FanEntity):
             self._available = False
             _LOGGER.error("Error updating fan: %s", err)
 
-    async def async_turn_on(self, speed: str = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    async def async_turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
         """Turn the device on."""
         _LOGGER.debug("Turn on: %s", speed)
 
diff --git a/homeassistant/components/vesync/fan.py b/homeassistant/components/vesync/fan.py
index 7cc3f00e1a0..1e2cc08473c 100644
--- a/homeassistant/components/vesync/fan.py
+++ b/homeassistant/components/vesync/fan.py
@@ -107,7 +107,20 @@ class VeSyncFanHA(VeSyncDevice, FanEntity):
         self.smartfan.manual_mode()
         self.smartfan.change_fan_speed(FAN_SPEEDS.index(speed))
 
-    def turn_on(self, speed: str = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    def turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
         """Turn the device on."""
         self.smartfan.turn_on()
         self.set_speed(speed)
diff --git a/homeassistant/components/wemo/fan.py b/homeassistant/components/wemo/fan.py
index 0dca71a0d8d..cef51a1e3b1 100644
--- a/homeassistant/components/wemo/fan.py
+++ b/homeassistant/components/wemo/fan.py
@@ -185,7 +185,20 @@ class WemoHumidifier(WemoSubscriptionEntity, FanEntity):
             self._available = False
             self.wemo.reconnect_with_device()
 
-    def turn_on(self, speed: str = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    def turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
         """Turn the switch on."""
         if speed is None:
             try:
diff --git a/homeassistant/components/wilight/fan.py b/homeassistant/components/wilight/fan.py
index 6d8ad88d6c0..d59b9398d9e 100644
--- a/homeassistant/components/wilight/fan.py
+++ b/homeassistant/components/wilight/fan.py
@@ -94,7 +94,20 @@ class WiLightFan(WiLightDevice, FanEntity):
                 self._direction = self._status["direction"]
         return self._direction
 
-    async def async_turn_on(self, speed: str = None, **kwargs):
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    async def async_turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
         """Turn on the fan."""
         if speed is None:
             await self._client.set_fan_direction(self._index, self._direction)
diff --git a/homeassistant/components/wink/fan.py b/homeassistant/components/wink/fan.py
index 535e7094fcd..3aab66e353d 100644
--- a/homeassistant/components/wink/fan.py
+++ b/homeassistant/components/wink/fan.py
@@ -40,7 +40,20 @@ class WinkFanDevice(WinkDevice, FanEntity):
         """Set the speed of the fan."""
         self.wink.set_state(True, speed)
 
-    def turn_on(self, speed: str = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    def turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
         """Turn on the fan."""
         self.wink.set_state(True, speed)
 
diff --git a/homeassistant/components/xiaomi_miio/fan.py b/homeassistant/components/xiaomi_miio/fan.py
index e2a1b3b8143..0d07654e61b 100644
--- a/homeassistant/components/xiaomi_miio/fan.py
+++ b/homeassistant/components/xiaomi_miio/fan.py
@@ -718,7 +718,20 @@ class XiaomiGenericDevice(FanEntity):
 
             return False
 
-    async def async_turn_on(self, speed: str = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    async def async_turn_on(
+        self,
+        speed: str = None,
+        percentage: int = None,
+        preset_mode: str = None,
+        **kwargs,
+    ) -> None:
         """Turn the device on."""
         if speed:
             # If operation mode was set the device must not be turned on.
diff --git a/homeassistant/components/zha/fan.py b/homeassistant/components/zha/fan.py
index b25d1c1aa39..bc5714ef08c 100644
--- a/homeassistant/components/zha/fan.py
+++ b/homeassistant/components/zha/fan.py
@@ -95,7 +95,16 @@ class BaseFan(FanEntity):
         """Flag supported features."""
         return SUPPORT_SET_SPEED
 
-    async def async_turn_on(self, speed: str = None, **kwargs) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    async def async_turn_on(
+        self, speed=None, percentage=None, preset_mode=None, **kwargs
+    ) -> None:
         """Turn the entity on."""
         if speed is None:
             speed = SPEED_MEDIUM
diff --git a/homeassistant/components/zwave/fan.py b/homeassistant/components/zwave/fan.py
index df6f5d8b8f5..1827996241d 100644
--- a/homeassistant/components/zwave/fan.py
+++ b/homeassistant/components/zwave/fan.py
@@ -58,7 +58,14 @@ class ZwaveFan(ZWaveDeviceEntity, FanEntity):
         """Set the speed of the fan."""
         self.node.set_dimmer(self.values.primary.value_id, SPEED_TO_VALUE[speed])
 
-    def turn_on(self, speed=None, **kwargs):
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    def turn_on(self, speed=None, percentage=None, preset_mode=None, **kwargs):
         """Turn the device on."""
         if speed is None:
             # Value 255 tells device to return to previous value
diff --git a/homeassistant/components/zwave_js/fan.py b/homeassistant/components/zwave_js/fan.py
index 7113272d2ea..29a93b38b8c 100644
--- a/homeassistant/components/zwave_js/fan.py
+++ b/homeassistant/components/zwave_js/fan.py
@@ -72,7 +72,20 @@ class ZwaveFan(ZWaveBaseEntity, FanEntity):
         target_value = self.get_zwave_value("targetValue")
         await self.info.node.async_set_value(target_value, SPEED_TO_VALUE[speed])
 
-    async def async_turn_on(self, speed: Optional[str] = None, **kwargs: Any) -> None:
+    #
+    # The fan entity model has changed to use percentages and preset_modes
+    # instead of speeds.
+    #
+    # Please review
+    # https://developers.home-assistant.io/docs/core/entity/fan/
+    #
+    async def async_turn_on(
+        self,
+        speed: Optional[str] = None,
+        percentage: Optional[int] = None,
+        preset_mode: Optional[str] = None,
+        **kwargs: Any,
+    ) -> None:
         """Turn the device on."""
         if speed is None:
             # Value 255 tells device to return to previous value
diff --git a/homeassistant/util/percentage.py b/homeassistant/util/percentage.py
new file mode 100644
index 00000000000..fa4c9dcc252
--- /dev/null
+++ b/homeassistant/util/percentage.py
@@ -0,0 +1,87 @@
+"""Percentage util functions."""
+
+from typing import List, Tuple
+
+
+def ordered_list_item_to_percentage(ordered_list: List[str], item: str) -> int:
+    """Determine the percentage of an item in an ordered list.
+
+    When using this utility for fan speeds, do not include "off"
+
+    Given the list: ["low", "medium", "high", "very_high"], this
+    function will return the following when when the item is passed
+    in:
+
+        low: 25
+        medium: 50
+        high: 75
+        very_high: 100
+
+    """
+    if item not in ordered_list:
+        raise ValueError
+
+    list_len = len(ordered_list)
+    list_position = ordered_list.index(item) + 1
+    return (list_position * 100) // list_len
+
+
+def percentage_to_ordered_list_item(ordered_list: List[str], percentage: int) -> str:
+    """Find the item that most closely matches the percentage in an ordered list.
+
+    When using this utility for fan speeds, do not include "off"
+
+    Given the list: ["low", "medium", "high", "very_high"], this
+    function will return the following when when the item is passed
+    in:
+
+        1-25: low
+        26-50: medium
+        51-75: high
+        76-100: very_high
+    """
+    list_len = len(ordered_list)
+    if not list_len:
+        raise ValueError
+
+    for offset, speed in enumerate(ordered_list):
+        list_position = offset + 1
+        upper_bound = (list_position * 100) // list_len
+        if percentage <= upper_bound:
+            return speed
+
+    return ordered_list[-1]
+
+
+def ranged_value_to_percentage(
+    low_high_range: Tuple[float, float], value: float
+) -> int:
+    """Given a range of low and high values convert a single value to a percentage.
+
+    When using this utility for fan speeds, do not include 0 if it is off
+
+    Given a low value of 1 and a high value of 255 this function
+    will return:
+
+    (1,255), 255: 100
+    (1,255), 127: 50
+    (1,255), 10: 4
+    """
+    return int((value * 100) // (low_high_range[1] - low_high_range[0] + 1))
+
+
+def percentage_to_ranged_value(
+    low_high_range: Tuple[float, float], percentage: int
+) -> float:
+    """Given a range of low and high values convert a percentage to a single value.
+
+    When using this utility for fan speeds, do not include 0 if it is off
+
+    Given a low value of 1 and a high value of 255 this function
+    will return:
+
+    (1,255), 100: 255
+    (1,255), 50: 127.5
+    (1,255), 4: 10.2
+    """
+    return (low_high_range[1] - low_high_range[0] + 1) * percentage / 100
diff --git a/tests/components/demo/test_fan.py b/tests/components/demo/test_fan.py
index 2dca57d3e6b..5297e64bda9 100644
--- a/tests/components/demo/test_fan.py
+++ b/tests/components/demo/test_fan.py
@@ -2,6 +2,7 @@
 import pytest
 
 from homeassistant.components import fan
+from homeassistant.components.demo.fan import PRESET_MODE_AUTO, PRESET_MODE_SMART
 from homeassistant.const import (
     ATTR_ENTITY_ID,
     ENTITY_MATCH_ALL,
@@ -12,7 +13,15 @@ from homeassistant.const import (
 )
 from homeassistant.setup import async_setup_component
 
-FAN_ENTITY_ID = "fan.living_room_fan"
+FULL_FAN_ENTITY_IDS = ["fan.living_room_fan", "fan.percentage_full_fan"]
+FANS_WITH_PRESET_MODE_ONLY = ["fan.preset_only_limited_fan"]
+LIMITED_AND_FULL_FAN_ENTITY_IDS = FULL_FAN_ENTITY_IDS + [
+    "fan.ceiling_fan",
+    "fan.percentage_limited_fan",
+]
+FANS_WITH_PRESET_MODES = FULL_FAN_ENTITY_IDS + [
+    "fan.percentage_limited_fan",
+]
 
 
 @pytest.fixture(autouse=True)
@@ -22,124 +31,338 @@ async def setup_comp(hass):
     await hass.async_block_till_done()
 
 
-async def test_turn_on(hass):
+@pytest.mark.parametrize("fan_entity_id", LIMITED_AND_FULL_FAN_ENTITY_IDS)
+async def test_turn_on(hass, fan_entity_id):
     """Test turning on the device."""
-    state = hass.states.get(FAN_ENTITY_ID)
+    state = hass.states.get(fan_entity_id)
     assert state.state == STATE_OFF
 
     await hass.services.async_call(
-        fan.DOMAIN, SERVICE_TURN_ON, {ATTR_ENTITY_ID: FAN_ENTITY_ID}, blocking=True
+        fan.DOMAIN, SERVICE_TURN_ON, {ATTR_ENTITY_ID: fan_entity_id}, blocking=True
     )
-    state = hass.states.get(FAN_ENTITY_ID)
+    state = hass.states.get(fan_entity_id)
     assert state.state == STATE_ON
 
+
+@pytest.mark.parametrize("fan_entity_id", FULL_FAN_ENTITY_IDS)
+async def test_turn_on_with_speed_and_percentage(hass, fan_entity_id):
+    """Test turning on the device."""
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_OFF
+    await hass.services.async_call(
+        fan.DOMAIN,
+        SERVICE_TURN_ON,
+        {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_SPEED: fan.SPEED_HIGH},
+        blocking=True,
+    )
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_ON
+    assert state.attributes[fan.ATTR_SPEED] == fan.SPEED_HIGH
+    assert state.attributes[fan.ATTR_PERCENTAGE] == 100
+
     await hass.services.async_call(
         fan.DOMAIN,
         SERVICE_TURN_ON,
-        {ATTR_ENTITY_ID: FAN_ENTITY_ID, fan.ATTR_SPEED: fan.SPEED_HIGH},
+        {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_PERCENTAGE: 100},
         blocking=True,
     )
-    state = hass.states.get(FAN_ENTITY_ID)
+    state = hass.states.get(fan_entity_id)
     assert state.state == STATE_ON
     assert state.attributes[fan.ATTR_SPEED] == fan.SPEED_HIGH
+    assert state.attributes[fan.ATTR_PERCENTAGE] == 100
 
 
-async def test_turn_off(hass):
+@pytest.mark.parametrize("fan_entity_id", FANS_WITH_PRESET_MODE_ONLY)
+async def test_turn_on_with_preset_mode_only(hass, fan_entity_id):
+    """Test turning on the device with a preset_mode and no speed setting."""
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_OFF
+    await hass.services.async_call(
+        fan.DOMAIN,
+        SERVICE_TURN_ON,
+        {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_PRESET_MODE: PRESET_MODE_AUTO},
+        blocking=True,
+    )
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_ON
+    assert state.attributes[fan.ATTR_PRESET_MODE] == PRESET_MODE_AUTO
+    assert state.attributes[fan.ATTR_PRESET_MODES] == [
+        PRESET_MODE_AUTO,
+        PRESET_MODE_SMART,
+    ]
+
+    await hass.services.async_call(
+        fan.DOMAIN,
+        SERVICE_TURN_ON,
+        {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_PRESET_MODE: PRESET_MODE_SMART},
+        blocking=True,
+    )
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_ON
+    assert state.attributes[fan.ATTR_PRESET_MODE] == PRESET_MODE_SMART
+
+    await hass.services.async_call(
+        fan.DOMAIN, SERVICE_TURN_OFF, {ATTR_ENTITY_ID: fan_entity_id}, blocking=True
+    )
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_OFF
+    assert state.attributes[fan.ATTR_PRESET_MODE] is None
+
+    with pytest.raises(ValueError):
+        await hass.services.async_call(
+            fan.DOMAIN,
+            SERVICE_TURN_ON,
+            {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_PRESET_MODE: "invalid"},
+            blocking=True,
+        )
+        await hass.async_block_till_done()
+
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_OFF
+    assert state.attributes[fan.ATTR_PRESET_MODE] is None
+
+
+@pytest.mark.parametrize("fan_entity_id", FANS_WITH_PRESET_MODES)
+async def test_turn_on_with_preset_mode_and_speed(hass, fan_entity_id):
+    """Test turning on the device with a preset_mode and speed."""
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_OFF
+    await hass.services.async_call(
+        fan.DOMAIN,
+        SERVICE_TURN_ON,
+        {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_PRESET_MODE: PRESET_MODE_AUTO},
+        blocking=True,
+    )
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_ON
+    assert state.attributes[fan.ATTR_SPEED] == PRESET_MODE_AUTO
+    assert state.attributes[fan.ATTR_PERCENTAGE] is None
+    assert state.attributes[fan.ATTR_PRESET_MODE] == PRESET_MODE_AUTO
+    assert state.attributes[fan.ATTR_SPEED_LIST] == [
+        fan.SPEED_OFF,
+        fan.SPEED_LOW,
+        fan.SPEED_MEDIUM,
+        fan.SPEED_HIGH,
+        PRESET_MODE_AUTO,
+        PRESET_MODE_SMART,
+    ]
+    assert state.attributes[fan.ATTR_PRESET_MODES] == [
+        PRESET_MODE_AUTO,
+        PRESET_MODE_SMART,
+    ]
+
+    await hass.services.async_call(
+        fan.DOMAIN,
+        SERVICE_TURN_ON,
+        {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_PERCENTAGE: 100},
+        blocking=True,
+    )
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_ON
+    assert state.attributes[fan.ATTR_SPEED] == fan.SPEED_HIGH
+    assert state.attributes[fan.ATTR_PERCENTAGE] == 100
+    assert state.attributes[fan.ATTR_PRESET_MODE] is None
+
+    await hass.services.async_call(
+        fan.DOMAIN,
+        SERVICE_TURN_ON,
+        {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_PRESET_MODE: PRESET_MODE_SMART},
+        blocking=True,
+    )
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_ON
+    assert state.attributes[fan.ATTR_SPEED] == PRESET_MODE_SMART
+    assert state.attributes[fan.ATTR_PERCENTAGE] is None
+    assert state.attributes[fan.ATTR_PRESET_MODE] == PRESET_MODE_SMART
+
+    await hass.services.async_call(
+        fan.DOMAIN, SERVICE_TURN_OFF, {ATTR_ENTITY_ID: fan_entity_id}, blocking=True
+    )
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_OFF
+    assert state.attributes[fan.ATTR_SPEED] == fan.SPEED_OFF
+    assert state.attributes[fan.ATTR_PERCENTAGE] == 0
+    assert state.attributes[fan.ATTR_PRESET_MODE] is None
+
+    with pytest.raises(ValueError):
+        await hass.services.async_call(
+            fan.DOMAIN,
+            SERVICE_TURN_ON,
+            {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_PRESET_MODE: "invalid"},
+            blocking=True,
+        )
+        await hass.async_block_till_done()
+
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_OFF
+    assert state.attributes[fan.ATTR_SPEED] == fan.SPEED_OFF
+    assert state.attributes[fan.ATTR_PERCENTAGE] == 0
+    assert state.attributes[fan.ATTR_PRESET_MODE] is None
+
+
+@pytest.mark.parametrize("fan_entity_id", LIMITED_AND_FULL_FAN_ENTITY_IDS)
+async def test_turn_off(hass, fan_entity_id):
     """Test turning off the device."""
-    state = hass.states.get(FAN_ENTITY_ID)
+    state = hass.states.get(fan_entity_id)
     assert state.state == STATE_OFF
 
     await hass.services.async_call(
-        fan.DOMAIN, SERVICE_TURN_ON, {ATTR_ENTITY_ID: FAN_ENTITY_ID}, blocking=True
+        fan.DOMAIN, SERVICE_TURN_ON, {ATTR_ENTITY_ID: fan_entity_id}, blocking=True
     )
-    state = hass.states.get(FAN_ENTITY_ID)
+    state = hass.states.get(fan_entity_id)
     assert state.state == STATE_ON
 
     await hass.services.async_call(
-        fan.DOMAIN, SERVICE_TURN_OFF, {ATTR_ENTITY_ID: FAN_ENTITY_ID}, blocking=True
+        fan.DOMAIN, SERVICE_TURN_OFF, {ATTR_ENTITY_ID: fan_entity_id}, blocking=True
     )
-    state = hass.states.get(FAN_ENTITY_ID)
+    state = hass.states.get(fan_entity_id)
     assert state.state == STATE_OFF
 
 
-async def test_turn_off_without_entity_id(hass):
+@pytest.mark.parametrize("fan_entity_id", LIMITED_AND_FULL_FAN_ENTITY_IDS)
+async def test_turn_off_without_entity_id(hass, fan_entity_id):
     """Test turning off all fans."""
-    state = hass.states.get(FAN_ENTITY_ID)
+    state = hass.states.get(fan_entity_id)
     assert state.state == STATE_OFF
 
     await hass.services.async_call(
-        fan.DOMAIN, SERVICE_TURN_ON, {ATTR_ENTITY_ID: FAN_ENTITY_ID}, blocking=True
+        fan.DOMAIN, SERVICE_TURN_ON, {ATTR_ENTITY_ID: fan_entity_id}, blocking=True
     )
-    state = hass.states.get(FAN_ENTITY_ID)
+    state = hass.states.get(fan_entity_id)
     assert state.state == STATE_ON
 
     await hass.services.async_call(
         fan.DOMAIN, SERVICE_TURN_OFF, {ATTR_ENTITY_ID: ENTITY_MATCH_ALL}, blocking=True
     )
-    state = hass.states.get(FAN_ENTITY_ID)
+    state = hass.states.get(fan_entity_id)
     assert state.state == STATE_OFF
 
 
-async def test_set_direction(hass):
+@pytest.mark.parametrize("fan_entity_id", FULL_FAN_ENTITY_IDS)
+async def test_set_direction(hass, fan_entity_id):
     """Test setting the direction of the device."""
-    state = hass.states.get(FAN_ENTITY_ID)
+    state = hass.states.get(fan_entity_id)
     assert state.state == STATE_OFF
 
     await hass.services.async_call(
         fan.DOMAIN,
         fan.SERVICE_SET_DIRECTION,
-        {ATTR_ENTITY_ID: FAN_ENTITY_ID, fan.ATTR_DIRECTION: fan.DIRECTION_REVERSE},
+        {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_DIRECTION: fan.DIRECTION_REVERSE},
         blocking=True,
     )
-    state = hass.states.get(FAN_ENTITY_ID)
+    state = hass.states.get(fan_entity_id)
     assert state.attributes[fan.ATTR_DIRECTION] == fan.DIRECTION_REVERSE
 
 
-async def test_set_speed(hass):
+@pytest.mark.parametrize("fan_entity_id", FULL_FAN_ENTITY_IDS)
+async def test_set_speed(hass, fan_entity_id):
     """Test setting the speed of the device."""
-    state = hass.states.get(FAN_ENTITY_ID)
+    state = hass.states.get(fan_entity_id)
     assert state.state == STATE_OFF
 
     await hass.services.async_call(
         fan.DOMAIN,
         fan.SERVICE_SET_SPEED,
-        {ATTR_ENTITY_ID: FAN_ENTITY_ID, fan.ATTR_SPEED: fan.SPEED_LOW},
+        {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_SPEED: fan.SPEED_LOW},
         blocking=True,
     )
-    state = hass.states.get(FAN_ENTITY_ID)
+    state = hass.states.get(fan_entity_id)
     assert state.attributes[fan.ATTR_SPEED] == fan.SPEED_LOW
 
 
-async def test_oscillate(hass):
+@pytest.mark.parametrize("fan_entity_id", FANS_WITH_PRESET_MODES)
+async def test_set_preset_mode(hass, fan_entity_id):
+    """Test setting the preset mode of the device."""
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_OFF
+
+    await hass.services.async_call(
+        fan.DOMAIN,
+        fan.SERVICE_SET_PRESET_MODE,
+        {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_PRESET_MODE: PRESET_MODE_AUTO},
+        blocking=True,
+    )
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_ON
+    assert state.attributes[fan.ATTR_SPEED] == PRESET_MODE_AUTO
+    assert state.attributes[fan.ATTR_PERCENTAGE] is None
+    assert state.attributes[fan.ATTR_PRESET_MODE] == PRESET_MODE_AUTO
+
+
+@pytest.mark.parametrize("fan_entity_id", LIMITED_AND_FULL_FAN_ENTITY_IDS)
+async def test_set_preset_mode_invalid(hass, fan_entity_id):
+    """Test setting a invalid preset mode for the device."""
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_OFF
+
+    with pytest.raises(ValueError):
+        await hass.services.async_call(
+            fan.DOMAIN,
+            fan.SERVICE_SET_PRESET_MODE,
+            {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_PRESET_MODE: "invalid"},
+            blocking=True,
+        )
+        await hass.async_block_till_done()
+
+    with pytest.raises(ValueError):
+        await hass.services.async_call(
+            fan.DOMAIN,
+            SERVICE_TURN_ON,
+            {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_PRESET_MODE: "invalid"},
+            blocking=True,
+        )
+        await hass.async_block_till_done()
+
+
+@pytest.mark.parametrize("fan_entity_id", FULL_FAN_ENTITY_IDS)
+async def test_set_percentage(hass, fan_entity_id):
+    """Test setting the percentage speed of the device."""
+    state = hass.states.get(fan_entity_id)
+    assert state.state == STATE_OFF
+
+    await hass.services.async_call(
+        fan.DOMAIN,
+        fan.SERVICE_SET_PERCENTAGE,
+        {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_PERCENTAGE: 33},
+        blocking=True,
+    )
+    state = hass.states.get(fan_entity_id)
+    assert state.attributes[fan.ATTR_SPEED] == fan.SPEED_LOW
+    assert state.attributes[fan.ATTR_PERCENTAGE] == 33
+
+
+@pytest.mark.parametrize("fan_entity_id", FULL_FAN_ENTITY_IDS)
+async def test_oscillate(hass, fan_entity_id):
     """Test oscillating the fan."""
-    state = hass.states.get(FAN_ENTITY_ID)
+    state = hass.states.get(fan_entity_id)
     assert state.state == STATE_OFF
     assert not state.attributes.get(fan.ATTR_OSCILLATING)
 
     await hass.services.async_call(
         fan.DOMAIN,
         fan.SERVICE_OSCILLATE,
-        {ATTR_ENTITY_ID: FAN_ENTITY_ID, fan.ATTR_OSCILLATING: True},
+        {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_OSCILLATING: True},
         blocking=True,
     )
-    state = hass.states.get(FAN_ENTITY_ID)
+    state = hass.states.get(fan_entity_id)
     assert state.attributes[fan.ATTR_OSCILLATING] is True
 
     await hass.services.async_call(
         fan.DOMAIN,
         fan.SERVICE_OSCILLATE,
-        {ATTR_ENTITY_ID: FAN_ENTITY_ID, fan.ATTR_OSCILLATING: False},
+        {ATTR_ENTITY_ID: fan_entity_id, fan.ATTR_OSCILLATING: False},
         blocking=True,
     )
-    state = hass.states.get(FAN_ENTITY_ID)
+    state = hass.states.get(fan_entity_id)
     assert state.attributes[fan.ATTR_OSCILLATING] is False
 
 
-async def test_is_on(hass):
+@pytest.mark.parametrize("fan_entity_id", LIMITED_AND_FULL_FAN_ENTITY_IDS)
+async def test_is_on(hass, fan_entity_id):
     """Test is on service call."""
-    assert not fan.is_on(hass, FAN_ENTITY_ID)
+    assert not fan.is_on(hass, fan_entity_id)
 
     await hass.services.async_call(
-        fan.DOMAIN, SERVICE_TURN_ON, {ATTR_ENTITY_ID: FAN_ENTITY_ID}, blocking=True
+        fan.DOMAIN, SERVICE_TURN_ON, {ATTR_ENTITY_ID: fan_entity_id}, blocking=True
     )
-    assert fan.is_on(hass, FAN_ENTITY_ID)
+    assert fan.is_on(hass, fan_entity_id)
diff --git a/tests/components/emulated_hue/test_hue_api.py b/tests/components/emulated_hue/test_hue_api.py
index 4d8079b9db9..04832f4adc7 100644
--- a/tests/components/emulated_hue/test_hue_api.py
+++ b/tests/components/emulated_hue/test_hue_api.py
@@ -70,16 +70,19 @@ ENTITY_IDS_BY_NUMBER = {
     "8": "media_player.lounge_room",
     "9": "fan.living_room_fan",
     "10": "fan.ceiling_fan",
-    "11": "cover.living_room_window",
-    "12": "climate.hvac",
-    "13": "climate.heatpump",
-    "14": "climate.ecobee",
-    "15": "light.no_brightness",
-    "16": "humidifier.humidifier",
-    "17": "humidifier.dehumidifier",
-    "18": "humidifier.hygrostat",
-    "19": "scene.light_on",
-    "20": "scene.light_off",
+    "11": "fan.percentage_full_fan",
+    "12": "fan.percentage_limited_fan",
+    "13": "fan.preset_only_limited_fan",
+    "14": "cover.living_room_window",
+    "15": "climate.hvac",
+    "16": "climate.heatpump",
+    "17": "climate.ecobee",
+    "18": "light.no_brightness",
+    "19": "humidifier.humidifier",
+    "20": "humidifier.dehumidifier",
+    "21": "humidifier.hygrostat",
+    "22": "scene.light_on",
+    "23": "scene.light_off",
 }
 
 ENTITY_NUMBERS_BY_ID = {v: k for k, v in ENTITY_IDS_BY_NUMBER.items()}
diff --git a/tests/components/fan/common.py b/tests/components/fan/common.py
index 70a2c7e43d3..215849e6aab 100644
--- a/tests/components/fan/common.py
+++ b/tests/components/fan/common.py
@@ -6,10 +6,14 @@ components. Instead call the service directly.
 from homeassistant.components.fan import (
     ATTR_DIRECTION,
     ATTR_OSCILLATING,
+    ATTR_PERCENTAGE,
+    ATTR_PRESET_MODE,
     ATTR_SPEED,
     DOMAIN,
     SERVICE_OSCILLATE,
     SERVICE_SET_DIRECTION,
+    SERVICE_SET_PERCENTAGE,
+    SERVICE_SET_PRESET_MODE,
     SERVICE_SET_SPEED,
 )
 from homeassistant.const import (
@@ -20,11 +24,22 @@ from homeassistant.const import (
 )
 
 
-async def async_turn_on(hass, entity_id=ENTITY_MATCH_ALL, speed: str = None) -> None:
+async def async_turn_on(
+    hass,
+    entity_id=ENTITY_MATCH_ALL,
+    speed: str = None,
+    percentage: int = None,
+    preset_mode: str = None,
+) -> None:
     """Turn all or specified fan on."""
     data = {
         key: value
-        for key, value in [(ATTR_ENTITY_ID, entity_id), (ATTR_SPEED, speed)]
+        for key, value in [
+            (ATTR_ENTITY_ID, entity_id),
+            (ATTR_SPEED, speed),
+            (ATTR_PERCENTAGE, percentage),
+            (ATTR_PRESET_MODE, preset_mode),
+        ]
         if value is not None
     }
 
@@ -65,6 +80,32 @@ async def async_set_speed(hass, entity_id=ENTITY_MATCH_ALL, speed: str = None) -
     await hass.services.async_call(DOMAIN, SERVICE_SET_SPEED, data, blocking=True)
 
 
+async def async_set_preset_mode(
+    hass, entity_id=ENTITY_MATCH_ALL, preset_mode: str = None
+) -> None:
+    """Set preset mode for all or specified fan."""
+    data = {
+        key: value
+        for key, value in [(ATTR_ENTITY_ID, entity_id), (ATTR_PRESET_MODE, preset_mode)]
+        if value is not None
+    }
+
+    await hass.services.async_call(DOMAIN, SERVICE_SET_PRESET_MODE, data, blocking=True)
+
+
+async def async_set_percentage(
+    hass, entity_id=ENTITY_MATCH_ALL, percentage: int = None
+) -> None:
+    """Set percentage for all or specified fan."""
+    data = {
+        key: value
+        for key, value in [(ATTR_ENTITY_ID, entity_id), (ATTR_PERCENTAGE, percentage)]
+        if value is not None
+    }
+
+    await hass.services.async_call(DOMAIN, SERVICE_SET_PERCENTAGE, data, blocking=True)
+
+
 async def async_set_direction(
     hass, entity_id=ENTITY_MATCH_ALL, direction: str = None
 ) -> None:
diff --git a/tests/components/fan/test_init.py b/tests/components/fan/test_init.py
index a8beed73a07..f5c303bd416 100644
--- a/tests/components/fan/test_init.py
+++ b/tests/components/fan/test_init.py
@@ -2,7 +2,7 @@
 
 import pytest
 
-from homeassistant.components.fan import FanEntity
+from homeassistant.components.fan import FanEntity, NotValidPresetModeError
 
 
 class BaseFan(FanEntity):
@@ -17,6 +17,7 @@ def test_fanentity():
     fan = BaseFan()
     assert fan.state == "off"
     assert len(fan.speed_list) == 0
+    assert len(fan.preset_modes) == 0
     assert fan.supported_features == 0
     assert fan.capability_attributes == {}
     # Test set_speed not required
@@ -24,7 +25,35 @@ def test_fanentity():
         fan.oscillate(True)
     with pytest.raises(NotImplementedError):
         fan.set_speed("slow")
+    with pytest.raises(NotImplementedError):
+        fan.set_percentage(0)
+    with pytest.raises(NotValidPresetModeError):
+        fan.set_preset_mode("auto")
     with pytest.raises(NotImplementedError):
         fan.turn_on()
     with pytest.raises(NotImplementedError):
         fan.turn_off()
+
+
+async def test_async_fanentity(hass):
+    """Test async fan entity methods."""
+    fan = BaseFan()
+    fan.hass = hass
+    assert fan.state == "off"
+    assert len(fan.speed_list) == 0
+    assert len(fan.preset_modes) == 0
+    assert fan.supported_features == 0
+    assert fan.capability_attributes == {}
+    # Test set_speed not required
+    with pytest.raises(NotImplementedError):
+        await fan.async_oscillate(True)
+    with pytest.raises(NotImplementedError):
+        await fan.async_set_speed("slow")
+    with pytest.raises(NotImplementedError):
+        await fan.async_set_percentage(0)
+    with pytest.raises(NotValidPresetModeError):
+        await fan.async_set_preset_mode("auto")
+    with pytest.raises(NotImplementedError):
+        await fan.async_turn_on()
+    with pytest.raises(NotImplementedError):
+        await fan.async_turn_off()
diff --git a/tests/components/google_assistant/__init__.py b/tests/components/google_assistant/__init__.py
index cb11f1ceaac..4bef45cf0ee 100644
--- a/tests/components/google_assistant/__init__.py
+++ b/tests/components/google_assistant/__init__.py
@@ -245,6 +245,27 @@ DEMO_DEVICES = [
         "type": "action.devices.types.FAN",
         "willReportState": False,
     },
+    {
+        "id": "fan.percentage_full_fan",
+        "name": {"name": "Percentage Full Fan"},
+        "traits": ["action.devices.traits.FanSpeed", "action.devices.traits.OnOff"],
+        "type": "action.devices.types.FAN",
+        "willReportState": False,
+    },
+    {
+        "id": "fan.percentage_limited_fan",
+        "name": {"name": "Percentage Limited Fan"},
+        "traits": ["action.devices.traits.FanSpeed", "action.devices.traits.OnOff"],
+        "type": "action.devices.types.FAN",
+        "willReportState": False,
+    },
+    {
+        "id": "fan.preset_only_limited_fan",
+        "name": {"name": "Preset Only Limited Fan"},
+        "traits": ["action.devices.traits.OnOff"],
+        "type": "action.devices.types.FAN",
+        "willReportState": False,
+    },
     {
         "id": "climate.hvac",
         "name": {"name": "Hvac"},
diff --git a/tests/util/test_percentage.py b/tests/util/test_percentage.py
new file mode 100644
index 00000000000..4ad28f8567c
--- /dev/null
+++ b/tests/util/test_percentage.py
@@ -0,0 +1,158 @@
+"""Test Home Assistant percentage conversions."""
+
+import math
+
+import pytest
+
+from homeassistant.util.percentage import (
+    ordered_list_item_to_percentage,
+    percentage_to_ordered_list_item,
+    percentage_to_ranged_value,
+    ranged_value_to_percentage,
+)
+
+SPEED_LOW = "low"
+SPEED_MEDIUM = "medium"
+SPEED_HIGH = "high"
+
+SPEED_1 = SPEED_LOW
+SPEED_2 = SPEED_MEDIUM
+SPEED_3 = SPEED_HIGH
+SPEED_4 = "very_high"
+SPEED_5 = "storm"
+SPEED_6 = "hurricane"
+SPEED_7 = "solar_wind"
+
+LEGACY_ORDERED_LIST = [SPEED_LOW, SPEED_MEDIUM, SPEED_HIGH]
+SMALL_ORDERED_LIST = [SPEED_1, SPEED_2, SPEED_3, SPEED_4]
+LARGE_ORDERED_LIST = [SPEED_1, SPEED_2, SPEED_3, SPEED_4, SPEED_5, SPEED_6, SPEED_7]
+
+
+async def test_ordered_list_percentage_round_trip():
+    """Test we can round trip."""
+    for ordered_list in (SMALL_ORDERED_LIST, LARGE_ORDERED_LIST):
+        for i in range(1, 100):
+            ordered_list_item_to_percentage(
+                ordered_list, percentage_to_ordered_list_item(ordered_list, i)
+            ) == i
+
+
+async def test_ordered_list_item_to_percentage():
+    """Test percentage of an item in an ordered list."""
+
+    assert ordered_list_item_to_percentage(LEGACY_ORDERED_LIST, SPEED_LOW) == 33
+    assert ordered_list_item_to_percentage(LEGACY_ORDERED_LIST, SPEED_MEDIUM) == 66
+    assert ordered_list_item_to_percentage(LEGACY_ORDERED_LIST, SPEED_HIGH) == 100
+
+    assert ordered_list_item_to_percentage(SMALL_ORDERED_LIST, SPEED_1) == 25
+    assert ordered_list_item_to_percentage(SMALL_ORDERED_LIST, SPEED_2) == 50
+    assert ordered_list_item_to_percentage(SMALL_ORDERED_LIST, SPEED_3) == 75
+    assert ordered_list_item_to_percentage(SMALL_ORDERED_LIST, SPEED_4) == 100
+
+    assert ordered_list_item_to_percentage(LARGE_ORDERED_LIST, SPEED_1) == 14
+    assert ordered_list_item_to_percentage(LARGE_ORDERED_LIST, SPEED_2) == 28
+    assert ordered_list_item_to_percentage(LARGE_ORDERED_LIST, SPEED_3) == 42
+    assert ordered_list_item_to_percentage(LARGE_ORDERED_LIST, SPEED_4) == 57
+    assert ordered_list_item_to_percentage(LARGE_ORDERED_LIST, SPEED_5) == 71
+    assert ordered_list_item_to_percentage(LARGE_ORDERED_LIST, SPEED_6) == 85
+    assert ordered_list_item_to_percentage(LARGE_ORDERED_LIST, SPEED_7) == 100
+
+    with pytest.raises(ValueError):
+        assert ordered_list_item_to_percentage([], SPEED_1)
+
+
+async def test_percentage_to_ordered_list_item():
+    """Test item that most closely matches the percentage in an ordered list."""
+
+    assert percentage_to_ordered_list_item(SMALL_ORDERED_LIST, 1) == SPEED_1
+    assert percentage_to_ordered_list_item(SMALL_ORDERED_LIST, 25) == SPEED_1
+    assert percentage_to_ordered_list_item(SMALL_ORDERED_LIST, 26) == SPEED_2
+    assert percentage_to_ordered_list_item(SMALL_ORDERED_LIST, 50) == SPEED_2
+    assert percentage_to_ordered_list_item(SMALL_ORDERED_LIST, 51) == SPEED_3
+    assert percentage_to_ordered_list_item(SMALL_ORDERED_LIST, 75) == SPEED_3
+    assert percentage_to_ordered_list_item(SMALL_ORDERED_LIST, 76) == SPEED_4
+    assert percentage_to_ordered_list_item(SMALL_ORDERED_LIST, 100) == SPEED_4
+
+    assert percentage_to_ordered_list_item(LEGACY_ORDERED_LIST, 17) == SPEED_LOW
+    assert percentage_to_ordered_list_item(LEGACY_ORDERED_LIST, 33) == SPEED_LOW
+    assert percentage_to_ordered_list_item(LEGACY_ORDERED_LIST, 50) == SPEED_MEDIUM
+    assert percentage_to_ordered_list_item(LEGACY_ORDERED_LIST, 66) == SPEED_MEDIUM
+    assert percentage_to_ordered_list_item(LEGACY_ORDERED_LIST, 84) == SPEED_HIGH
+    assert percentage_to_ordered_list_item(LEGACY_ORDERED_LIST, 100) == SPEED_HIGH
+
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 1) == SPEED_1
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 14) == SPEED_1
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 25) == SPEED_2
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 26) == SPEED_2
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 28) == SPEED_2
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 29) == SPEED_3
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 41) == SPEED_3
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 42) == SPEED_3
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 43) == SPEED_4
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 56) == SPEED_4
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 50) == SPEED_4
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 51) == SPEED_4
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 75) == SPEED_6
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 76) == SPEED_6
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 100) == SPEED_7
+
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 1) == SPEED_1
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 25) == SPEED_2
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 26) == SPEED_2
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 50) == SPEED_4
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 51) == SPEED_4
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 75) == SPEED_6
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 76) == SPEED_6
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 100) == SPEED_7
+
+    assert percentage_to_ordered_list_item(LARGE_ORDERED_LIST, 100.1) == SPEED_7
+
+    with pytest.raises(ValueError):
+        assert percentage_to_ordered_list_item([], 100)
+
+
+async def test_ranged_value_to_percentage_large():
+    """Test a large range of low and high values convert a single value to a percentage."""
+    range = (1, 255)
+
+    assert ranged_value_to_percentage(range, 255) == 100
+    assert ranged_value_to_percentage(range, 127) == 49
+    assert ranged_value_to_percentage(range, 10) == 3
+    assert ranged_value_to_percentage(range, 1) == 0
+
+
+async def test_percentage_to_ranged_value_large():
+    """Test a large range of low and high values convert a percentage to a single value."""
+    range = (1, 255)
+
+    assert percentage_to_ranged_value(range, 100) == 255
+    assert percentage_to_ranged_value(range, 50) == 127.5
+    assert percentage_to_ranged_value(range, 4) == 10.2
+
+    assert math.ceil(percentage_to_ranged_value(range, 100)) == 255
+    assert math.ceil(percentage_to_ranged_value(range, 50)) == 128
+    assert math.ceil(percentage_to_ranged_value(range, 4)) == 11
+
+
+async def test_ranged_value_to_percentage_small():
+    """Test a small range of low and high values convert a single value to a percentage."""
+    range = (1, 6)
+
+    assert ranged_value_to_percentage(range, 1) == 16
+    assert ranged_value_to_percentage(range, 2) == 33
+    assert ranged_value_to_percentage(range, 3) == 50
+    assert ranged_value_to_percentage(range, 4) == 66
+    assert ranged_value_to_percentage(range, 5) == 83
+    assert ranged_value_to_percentage(range, 6) == 100
+
+
+async def test_percentage_to_ranged_value_small():
+    """Test a small range of low and high values convert a percentage to a single value."""
+    range = (1, 6)
+
+    assert math.ceil(percentage_to_ranged_value(range, 16)) == 1
+    assert math.ceil(percentage_to_ranged_value(range, 33)) == 2
+    assert math.ceil(percentage_to_ranged_value(range, 50)) == 3
+    assert math.ceil(percentage_to_ranged_value(range, 66)) == 4
+    assert math.ceil(percentage_to_ranged_value(range, 83)) == 5
+    assert math.ceil(percentage_to_ranged_value(range, 100)) == 6