diff --git a/homeassistant/components/gdacs/__init__.py b/homeassistant/components/gdacs/__init__.py
index 56f17adc992..d4fe4177aed 100644
--- a/homeassistant/components/gdacs/__init__.py
+++ b/homeassistant/components/gdacs/__init__.py
@@ -12,6 +12,7 @@ from homeassistant.const import (
     CONF_RADIUS,
     CONF_SCAN_INTERVAL,
     CONF_UNIT_SYSTEM_IMPERIAL,
+    LENGTH_KILOMETERS,
     LENGTH_MILES,
 )
 from homeassistant.core import HomeAssistant, callback
@@ -19,7 +20,7 @@ from homeassistant.helpers import aiohttp_client, config_validation as cv
 from homeassistant.helpers.dispatcher import async_dispatcher_send
 from homeassistant.helpers.event import async_track_time_interval
 from homeassistant.helpers.typing import ConfigType
-from homeassistant.util.unit_system import METRIC_SYSTEM
+from homeassistant.util.unit_conversion import DistanceConverter
 
 from .const import (
     CONF_CATEGORIES,
@@ -88,7 +89,7 @@ async def async_setup_entry(hass: HomeAssistant, config_entry: ConfigEntry) -> b
 
     radius = config_entry.data[CONF_RADIUS]
     if hass.config.units.name == CONF_UNIT_SYSTEM_IMPERIAL:
-        radius = METRIC_SYSTEM.length(radius, LENGTH_MILES)
+        radius = DistanceConverter.convert(radius, LENGTH_MILES, LENGTH_KILOMETERS)
     # Create feed entity manager for all platforms.
     manager = GdacsFeedEntityManager(hass, config_entry, radius)
     feeds[config_entry.entry_id] = manager
diff --git a/homeassistant/components/geonetnz_quakes/__init__.py b/homeassistant/components/geonetnz_quakes/__init__.py
index 6c091e71f05..e4d766fa979 100644
--- a/homeassistant/components/geonetnz_quakes/__init__.py
+++ b/homeassistant/components/geonetnz_quakes/__init__.py
@@ -12,6 +12,7 @@ from homeassistant.const import (
     CONF_RADIUS,
     CONF_SCAN_INTERVAL,
     CONF_UNIT_SYSTEM_IMPERIAL,
+    LENGTH_KILOMETERS,
     LENGTH_MILES,
 )
 from homeassistant.core import HomeAssistant, callback
@@ -19,7 +20,7 @@ from homeassistant.helpers import aiohttp_client, config_validation as cv
 from homeassistant.helpers.dispatcher import async_dispatcher_send
 from homeassistant.helpers.event import async_track_time_interval
 from homeassistant.helpers.typing import ConfigType
-from homeassistant.util.unit_system import METRIC_SYSTEM
+from homeassistant.util.unit_conversion import DistanceConverter
 
 from .const import (
     CONF_MINIMUM_MAGNITUDE,
@@ -95,7 +96,7 @@ async def async_setup_entry(hass: HomeAssistant, config_entry: ConfigEntry) -> b
 
     radius = config_entry.data[CONF_RADIUS]
     if hass.config.units.name == CONF_UNIT_SYSTEM_IMPERIAL:
-        radius = METRIC_SYSTEM.length(radius, LENGTH_MILES)
+        radius = DistanceConverter.convert(radius, LENGTH_MILES, LENGTH_KILOMETERS)
     # Create feed entity manager for all platforms.
     manager = GeonetnzQuakesFeedEntityManager(hass, config_entry, radius)
     feeds[config_entry.entry_id] = manager
diff --git a/homeassistant/components/geonetnz_volcano/__init__.py b/homeassistant/components/geonetnz_volcano/__init__.py
index a1b6368c8ef..e4bf2d2cb8c 100644
--- a/homeassistant/components/geonetnz_volcano/__init__.py
+++ b/homeassistant/components/geonetnz_volcano/__init__.py
@@ -15,6 +15,7 @@ from homeassistant.const import (
     CONF_SCAN_INTERVAL,
     CONF_UNIT_SYSTEM,
     CONF_UNIT_SYSTEM_IMPERIAL,
+    LENGTH_KILOMETERS,
     LENGTH_MILES,
 )
 from homeassistant.core import HomeAssistant, callback
@@ -22,7 +23,7 @@ from homeassistant.helpers import aiohttp_client, config_validation as cv
 from homeassistant.helpers.dispatcher import async_dispatcher_send
 from homeassistant.helpers.event import async_track_time_interval
 from homeassistant.helpers.typing import ConfigType
-from homeassistant.util.unit_system import METRIC_SYSTEM
+from homeassistant.util.unit_conversion import DistanceConverter
 
 from .config_flow import configured_instances
 from .const import DEFAULT_RADIUS, DEFAULT_SCAN_INTERVAL, DOMAIN, FEED, PLATFORMS
@@ -85,7 +86,7 @@ async def async_setup_entry(hass: HomeAssistant, config_entry: ConfigEntry) -> b
     radius = config_entry.data[CONF_RADIUS]
     unit_system = config_entry.data[CONF_UNIT_SYSTEM]
     if unit_system == CONF_UNIT_SYSTEM_IMPERIAL:
-        radius = METRIC_SYSTEM.length(radius, LENGTH_MILES)
+        radius = DistanceConverter.convert(radius, LENGTH_MILES, LENGTH_KILOMETERS)
     # Create feed entity manager for all platforms.
     manager = GeonetnzVolcanoFeedEntityManager(hass, config_entry, radius, unit_system)
     hass.data[DOMAIN][FEED][config_entry.entry_id] = manager
diff --git a/homeassistant/components/geonetnz_volcano/sensor.py b/homeassistant/components/geonetnz_volcano/sensor.py
index add35bfbcd7..51bca3e467a 100644
--- a/homeassistant/components/geonetnz_volcano/sensor.py
+++ b/homeassistant/components/geonetnz_volcano/sensor.py
@@ -11,12 +11,13 @@ from homeassistant.const import (
     ATTR_LONGITUDE,
     CONF_UNIT_SYSTEM_IMPERIAL,
     LENGTH_KILOMETERS,
+    LENGTH_MILES,
 )
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.util import dt
-from homeassistant.util.unit_system import IMPERIAL_SYSTEM
+from homeassistant.util.unit_conversion import DistanceConverter
 
 from .const import (
     ATTR_ACTIVITY,
@@ -114,7 +115,9 @@ class GeonetnzVolcanoSensor(SensorEntity):
         # Convert distance if not metric system.
         if self._unit_system == CONF_UNIT_SYSTEM_IMPERIAL:
             self._distance = round(
-                IMPERIAL_SYSTEM.length(feed_entry.distance_to_home, LENGTH_KILOMETERS),
+                DistanceConverter.convert(
+                    feed_entry.distance_to_home, LENGTH_KILOMETERS, LENGTH_MILES
+                ),
                 1,
             )
         else:
diff --git a/homeassistant/components/here_travel_time/__init__.py b/homeassistant/components/here_travel_time/__init__.py
index 8f63060b683..ddfdc34ff69 100644
--- a/homeassistant/components/here_travel_time/__init__.py
+++ b/homeassistant/components/here_travel_time/__init__.py
@@ -16,6 +16,7 @@ from homeassistant.const import (
     CONF_UNIT_SYSTEM,
     CONF_UNIT_SYSTEM_IMPERIAL,
     LENGTH_METERS,
+    LENGTH_MILES,
     Platform,
 )
 from homeassistant.core import HomeAssistant
@@ -23,7 +24,7 @@ import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.location import find_coordinates
 from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, UpdateFailed
 from homeassistant.util import dt
-from homeassistant.util.unit_system import IMPERIAL_SYSTEM
+from homeassistant.util.unit_conversion import DistanceConverter
 
 from .const import (
     ATTR_DESTINATION,
@@ -179,7 +180,9 @@ class HereTravelTimeDataUpdateCoordinator(DataUpdateCoordinator):
                 traffic_time = summary["trafficTime"]
             if self.config.units == CONF_UNIT_SYSTEM_IMPERIAL:
                 # Convert to miles.
-                distance = IMPERIAL_SYSTEM.length(distance, LENGTH_METERS)
+                distance = DistanceConverter.convert(
+                    distance, LENGTH_METERS, LENGTH_MILES
+                )
             else:
                 # Convert to kilometers
                 distance = distance / 1000
diff --git a/homeassistant/components/nissan_leaf/sensor.py b/homeassistant/components/nissan_leaf/sensor.py
index 64847e3fa5c..0e7cc0c00cd 100644
--- a/homeassistant/components/nissan_leaf/sensor.py
+++ b/homeassistant/components/nissan_leaf/sensor.py
@@ -12,7 +12,7 @@ from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.icon import icon_for_battery_level
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
-from homeassistant.util.unit_system import IMPERIAL_SYSTEM, METRIC_SYSTEM
+from homeassistant.util.unit_conversion import DistanceConverter
 
 from . import LeafEntity
 from .const import (
@@ -123,7 +123,7 @@ class LeafRangeSensor(LeafEntity, SensorEntity):
             return None
 
         if not self.car.hass.config.units.is_metric or self.car.force_miles:
-            ret = IMPERIAL_SYSTEM.length(ret, METRIC_SYSTEM.length_unit)
+            ret = DistanceConverter.convert(ret, LENGTH_KILOMETERS, LENGTH_MILES)
 
         return round(ret)
 
diff --git a/homeassistant/components/waze_travel_time/sensor.py b/homeassistant/components/waze_travel_time/sensor.py
index 153ada11349..85b6acdc19a 100644
--- a/homeassistant/components/waze_travel_time/sensor.py
+++ b/homeassistant/components/waze_travel_time/sensor.py
@@ -19,6 +19,7 @@ from homeassistant.const import (
     CONF_UNIT_SYSTEM_IMPERIAL,
     EVENT_HOMEASSISTANT_STARTED,
     LENGTH_KILOMETERS,
+    LENGTH_MILES,
     TIME_MINUTES,
 )
 from homeassistant.core import CoreState, HomeAssistant
@@ -26,7 +27,7 @@ from homeassistant.helpers.device_registry import DeviceEntryType
 from homeassistant.helpers.entity import DeviceInfo
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.location import find_coordinates
-from homeassistant.util.unit_system import IMPERIAL_SYSTEM
+from homeassistant.util.unit_conversion import DistanceConverter
 
 from .const import (
     CONF_AVOID_FERRIES,
@@ -245,7 +246,9 @@ class WazeTravelTimeData:
 
                 if units == CONF_UNIT_SYSTEM_IMPERIAL:
                     # Convert to miles.
-                    self.distance = IMPERIAL_SYSTEM.length(distance, LENGTH_KILOMETERS)
+                    self.distance = DistanceConverter.convert(
+                        distance, LENGTH_KILOMETERS, LENGTH_MILES
+                    )
                 else:
                     self.distance = distance