diff --git a/homeassistant/components/number/const.py b/homeassistant/components/number/const.py
index 6a5809610ee..2a9c4057168 100644
--- a/homeassistant/components/number/const.py
+++ b/homeassistant/components/number/const.py
@@ -176,7 +176,7 @@ class NumberDeviceClass(StrEnum):
     Use this device class for sensors measuring energy by distance, for example the amount
     of electric energy consumed by an electric car.
 
-    Unit of measurement: `kWh/100km`, `mi/kWh`, `km/kWh`
+    Unit of measurement: `kWh/100km`, `Wh/km`, `mi/kWh`, `km/kWh`
     """
 
     ENERGY_STORAGE = "energy_storage"
diff --git a/homeassistant/components/sensor/const.py b/homeassistant/components/sensor/const.py
index 31b33303dd4..c466bc52703 100644
--- a/homeassistant/components/sensor/const.py
+++ b/homeassistant/components/sensor/const.py
@@ -205,7 +205,7 @@ class SensorDeviceClass(StrEnum):
     Use this device class for sensors measuring energy by distance, for example the amount
     of electric energy consumed by an electric car.
 
-    Unit of measurement: `kWh/100km`, `mi/kWh`, `km/kWh`
+    Unit of measurement: `kWh/100km`, `Wh/km`, `mi/kWh`, `km/kWh`
     """
 
     ENERGY_STORAGE = "energy_storage"
diff --git a/homeassistant/const.py b/homeassistant/const.py
index a3674d6e5d6..5b299fd0187 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -647,6 +647,7 @@ class UnitOfEnergyDistance(StrEnum):
     """Energy Distance units."""
 
     KILO_WATT_HOUR_PER_100_KM = "kWh/100km"
+    WATT_HOUR_PER_KM = "Wh/km"
     MILES_PER_KILO_WATT_HOUR = "mi/kWh"
     KM_PER_KILO_WATT_HOUR = "km/kWh"
 
diff --git a/homeassistant/util/unit_conversion.py b/homeassistant/util/unit_conversion.py
index 0355aa96aca..2ee7b5cd384 100644
--- a/homeassistant/util/unit_conversion.py
+++ b/homeassistant/util/unit_conversion.py
@@ -313,6 +313,7 @@ class EnergyDistanceConverter(BaseUnitConverter):
     UNIT_CLASS = "energy_distance"
     _UNIT_CONVERSION: dict[str | None, float] = {
         UnitOfEnergyDistance.KILO_WATT_HOUR_PER_100_KM: 1,
+        UnitOfEnergyDistance.WATT_HOUR_PER_KM: 10,
         UnitOfEnergyDistance.MILES_PER_KILO_WATT_HOUR: 100 * _KM_TO_M / _MILE_TO_M,
         UnitOfEnergyDistance.KM_PER_KILO_WATT_HOUR: 100,
     }
diff --git a/tests/util/test_unit_conversion.py b/tests/util/test_unit_conversion.py
index 885757b7eb4..0e9da5dbf3d 100644
--- a/tests/util/test_unit_conversion.py
+++ b/tests/util/test_unit_conversion.py
@@ -509,6 +509,18 @@ _CONVERTED_VALUE: dict[
             6.213712,
             UnitOfEnergyDistance.MILES_PER_KILO_WATT_HOUR,
         ),
+        (
+            10,
+            UnitOfEnergyDistance.KILO_WATT_HOUR_PER_100_KM,
+            100,
+            UnitOfEnergyDistance.WATT_HOUR_PER_KM,
+        ),
+        (
+            15,
+            UnitOfEnergyDistance.WATT_HOUR_PER_KM,
+            1.5,
+            UnitOfEnergyDistance.KILO_WATT_HOUR_PER_100_KM,
+        ),
         (
             25,
             UnitOfEnergyDistance.KILO_WATT_HOUR_PER_100_KM,