diff --git a/homeassistant/components/number/const.py b/homeassistant/components/number/const.py
index a7493194847..f44a510b1c0 100644
--- a/homeassistant/components/number/const.py
+++ b/homeassistant/components/number/const.py
@@ -487,6 +487,7 @@ DEVICE_CLASS_UNITS: dict[NumberDeviceClass, set[type[StrEnum] | str | None]] = {
     NumberDeviceClass.PM25: {CONCENTRATION_MICROGRAMS_PER_CUBIC_METER},
     NumberDeviceClass.POWER_FACTOR: {PERCENTAGE, None},
     NumberDeviceClass.POWER: {
+        UnitOfPower.MILLIWATT,
         UnitOfPower.WATT,
         UnitOfPower.KILO_WATT,
         UnitOfPower.MEGA_WATT,
diff --git a/homeassistant/components/sensor/const.py b/homeassistant/components/sensor/const.py
index 774f2a9cff2..e1f7dd13d93 100644
--- a/homeassistant/components/sensor/const.py
+++ b/homeassistant/components/sensor/const.py
@@ -583,6 +583,7 @@ DEVICE_CLASS_UNITS: dict[SensorDeviceClass, set[type[StrEnum] | str | None]] = {
     SensorDeviceClass.PM25: {CONCENTRATION_MICROGRAMS_PER_CUBIC_METER},
     SensorDeviceClass.POWER_FACTOR: {PERCENTAGE, None},
     SensorDeviceClass.POWER: {
+        UnitOfPower.MILLIWATT,
         UnitOfPower.WATT,
         UnitOfPower.KILO_WATT,
         UnitOfPower.MEGA_WATT,