diff --git a/homeassistant/components/insteon/fan.py b/homeassistant/components/insteon/fan.py
index f9d1c381f49..3327f9df5eb 100644
--- a/homeassistant/components/insteon/fan.py
+++ b/homeassistant/components/insteon/fan.py
@@ -1,28 +1,24 @@
 """Support for INSTEON fans via PowerLinc Modem."""
+import math
+
 from pyinsteon.constants import FanSpeed
 
 from homeassistant.components.fan import (
     DOMAIN as FAN_DOMAIN,
-    SPEED_HIGH,
-    SPEED_LOW,
-    SPEED_MEDIUM,
-    SPEED_OFF,
     SUPPORT_SET_SPEED,
     FanEntity,
 )
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
+from homeassistant.util.percentage import (
+    percentage_to_ranged_value,
+    ranged_value_to_percentage,
+)
 
 from .const import SIGNAL_ADD_ENTITIES
 from .insteon_entity import InsteonEntity
 from .utils import async_add_insteon_entities
 
-FAN_SPEEDS = [SPEED_OFF, SPEED_LOW, SPEED_MEDIUM, SPEED_HIGH]
-SPEED_TO_VALUE = {
-    SPEED_OFF: FanSpeed.OFF,
-    SPEED_LOW: FanSpeed.LOW,
-    SPEED_MEDIUM: FanSpeed.MEDIUM,
-    SPEED_HIGH: FanSpeed.HIGH,
-}
+SPEED_RANGE = (1, FanSpeed.HIGH)  # off is not included
 
 
 async def async_setup_entry(hass, config_entry, async_add_entities):
@@ -43,33 +39,17 @@ class InsteonFanEntity(InsteonEntity, FanEntity):
     """An INSTEON fan entity."""
 
     @property
-    def speed(self) -> str:
-        """Return the current speed."""
-        if self._insteon_device_group.value == FanSpeed.HIGH:
-            return SPEED_HIGH
-        if self._insteon_device_group.value == FanSpeed.MEDIUM:
-            return SPEED_MEDIUM
-        if self._insteon_device_group.value == FanSpeed.LOW:
-            return SPEED_LOW
-        return SPEED_OFF
-
-    @property
-    def speed_list(self) -> list:
-        """Get the list of available speeds."""
-        return FAN_SPEEDS
+    def percentage(self) -> str:
+        """Return the current speed percentage."""
+        if self._insteon_device_group.value is None:
+            return None
+        return ranged_value_to_percentage(SPEED_RANGE, self._insteon_device_group.value)
 
     @property
     def supported_features(self) -> int:
         """Flag supported features."""
         return SUPPORT_SET_SPEED
 
-    #
-    # 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,
@@ -78,18 +58,18 @@ class InsteonFanEntity(InsteonEntity, FanEntity):
         **kwargs,
     ) -> None:
         """Turn on the fan."""
-        if speed is None:
-            speed = SPEED_MEDIUM
-        await self.async_set_speed(speed)
+        if percentage is None:
+            percentage = 50
+        await self.async_set_percentage(percentage)
 
     async def async_turn_off(self, **kwargs) -> None:
         """Turn off the fan."""
         await self._insteon_device.async_fan_off()
 
-    async def async_set_speed(self, speed: str) -> None:
-        """Set the speed of the fan."""
-        fan_speed = SPEED_TO_VALUE[speed]
-        if fan_speed == FanSpeed.OFF:
+    async def async_set_percentage(self, percentage: int) -> None:
+        """Set the speed percentage of the fan."""
+        if percentage == 0:
             await self._insteon_device.async_fan_off()
         else:
-            await self._insteon_device.async_fan_on(on_level=fan_speed)
+            on_level = math.ceil(percentage_to_ranged_value(SPEED_RANGE, percentage))
+            await self._insteon_device.async_fan_on(on_level=on_level)