diff --git a/homeassistant/components/mqtt/number.py b/homeassistant/components/mqtt/number.py
index c3cc31bf04f..feaa0189108 100644
--- a/homeassistant/components/mqtt/number.py
+++ b/homeassistant/components/mqtt/number.py
@@ -16,6 +16,7 @@ from homeassistant.components.number import (
     NumberMode,
     RestoreNumber,
 )
+from homeassistant.components.sensor.recorder import EQUIVALENT_UNITS
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import (
     CONF_DEVICE_CLASS,
@@ -70,6 +71,13 @@ MQTT_NUMBER_ATTRIBUTES_BLOCKED = frozenset(
 
 def validate_config(config: ConfigType) -> ConfigType:
     """Validate that the configuration is valid, throws if it isn't."""
+    if (
+        CONF_UNIT_OF_MEASUREMENT in config
+        and (unit_of_measurement := config[CONF_UNIT_OF_MEASUREMENT])
+        in EQUIVALENT_UNITS
+    ):
+        config[CONF_UNIT_OF_MEASUREMENT] = EQUIVALENT_UNITS[unit_of_measurement]
+
     if config[CONF_MIN] > config[CONF_MAX]:
         raise vol.Invalid(f"{CONF_MAX} must be >= {CONF_MIN}")
 
diff --git a/homeassistant/components/mqtt/sensor.py b/homeassistant/components/mqtt/sensor.py
index b48a3c37a81..d7ac3d9474a 100644
--- a/homeassistant/components/mqtt/sensor.py
+++ b/homeassistant/components/mqtt/sensor.py
@@ -130,13 +130,15 @@ def validate_sensor_state_and_device_class_config(config: ConfigType) -> ConfigT
 
     if (device_class := config.get(CONF_DEVICE_CLASS)) is None or (
         unit_of_measurement := config.get(CONF_UNIT_OF_MEASUREMENT)
-    ) is None:
+    ) in EQUIVALENT_UNITS:
+        unit_of_measurement = EQUIVALENT_UNITS[unit_of_measurement]
+        config[CONF_UNIT_OF_MEASUREMENT] = unit_of_measurement
+
+    if (
+        device_class := config.get(CONF_DEVICE_CLASS)
+    ) is None or unit_of_measurement is None:
         return config
 
-    if unit_of_measurement in EQUIVALENT_UNITS:
-        unit_of_measurement = config[CONF_UNIT_OF_MEASUREMENT] = EQUIVALENT_UNITS[
-            unit_of_measurement
-        ]
     if (
         device_class in DEVICE_CLASS_UNITS
         and unit_of_measurement not in DEVICE_CLASS_UNITS[device_class]
diff --git a/homeassistant/components/sensor/recorder.py b/homeassistant/components/sensor/recorder.py
index 6c1ff110392..1f8caf75667 100644
--- a/homeassistant/components/sensor/recorder.py
+++ b/homeassistant/components/sensor/recorder.py
@@ -91,7 +91,7 @@ EQUIVALENT_UNITS = {
     "\u00b5g/ft³": CONCENTRATION_MICROGRAMS_PER_CUBIC_FOOT,
     "\u00b5g/m³": CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
     "\u00b5mol/s⋅m²": "μmol/s⋅m²",  # fyta: light
-    "\u0065g": UnitOfMass.MICROGRAMS,
+    "\u00b5g": UnitOfMass.MICROGRAMS,
     "\u00b5s": UnitOfTime.MICROSECONDS,
 }
 
diff --git a/tests/components/mqtt/test_number.py b/tests/components/mqtt/test_number.py
index fd54e5f0643..9d5dc8f0a8a 100644
--- a/tests/components/mqtt/test_number.py
+++ b/tests/components/mqtt/test_number.py
@@ -26,6 +26,7 @@ from homeassistant.const import (
     ATTR_ENTITY_ID,
     ATTR_MODE,
     ATTR_UNIT_OF_MEASUREMENT,
+    UnitOfElectricPotential,
     UnitOfTemperature,
 )
 from homeassistant.core import HomeAssistant, State
@@ -253,6 +254,62 @@ async def test_native_value_validation(
     mqtt_mock.async_publish.reset_mock()
 
 
+@pytest.mark.parametrize(
+    "hass_config",
+    [
+        {
+            mqtt.DOMAIN: {
+                number.DOMAIN: {
+                    "name": "test",
+                    "command_topic": "test-topic-cmd",
+                    "state_topic": "test-topic",
+                    "unit_of_measurement": "\u00b5V",
+                }
+            }
+        }
+    ],
+)
+async def test_equivalent_unit_of_measurement(
+    hass: HomeAssistant,
+    mqtt_mock_entry: MqttMockHAClientGenerator,
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """Test device_class with equivalent unit of measurement."""
+    assert await mqtt_mock_entry()
+    async_fire_mqtt_message(hass, "test-topic", "100")
+    await hass.async_block_till_done()
+    state = hass.states.get("number.test")
+    assert state is not None
+    assert state.state == "100"
+    assert (
+        state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
+        is UnitOfElectricPotential.MICROVOLT
+    )
+
+    caplog.clear()
+
+    discovery_payload = {
+        "name": "bla",
+        "command_topic": "test-topic2-cmd",
+        "state_topic": "test-topic2",
+        "unit_of_measurement": "\u00b5V",
+    }
+    # Now discover an invalid sensor
+    async_fire_mqtt_message(
+        hass, "homeassistant/number/bla/config", json.dumps(discovery_payload)
+    )
+    await hass.async_block_till_done()
+    async_fire_mqtt_message(hass, "test-topic2", "21")
+    await hass.async_block_till_done()
+    state = hass.states.get("number.bla")
+    assert state is not None
+    assert state.state == "21"
+    assert (
+        state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
+        is UnitOfElectricPotential.MICROVOLT
+    )
+
+
 @pytest.mark.parametrize(
     "hass_config",
     [
diff --git a/tests/components/mqtt/test_sensor.py b/tests/components/mqtt/test_sensor.py
index ffe93851e48..a42df8f3811 100644
--- a/tests/components/mqtt/test_sensor.py
+++ b/tests/components/mqtt/test_sensor.py
@@ -15,9 +15,11 @@ import pytest
 from homeassistant.components import mqtt, sensor
 from homeassistant.components.mqtt.sensor import MQTT_SENSOR_ATTRIBUTES_BLOCKED
 from homeassistant.const import (
+    ATTR_UNIT_OF_MEASUREMENT,
     EVENT_STATE_CHANGED,
     STATE_UNAVAILABLE,
     STATE_UNKNOWN,
+    UnitOfElectricPotential,
     UnitOfTemperature,
 )
 from homeassistant.core import Event, HomeAssistant, State, callback
@@ -933,6 +935,10 @@ async def test_device_class_with_equivalent_unit_of_measurement_received(
     state = hass.states.get("sensor.test")
     assert state is not None
     assert state.state == "100"
+    assert (
+        state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
+        is UnitOfElectricPotential.MICROVOLT
+    )
 
     caplog.clear()
 
@@ -952,6 +958,10 @@ async def test_device_class_with_equivalent_unit_of_measurement_received(
     state = hass.states.get("sensor.bla")
     assert state is not None
     assert state.state == "21"
+    assert (
+        state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
+        is UnitOfElectricPotential.MICROVOLT
+    )
 
 
 @pytest.mark.parametrize(
@@ -980,6 +990,10 @@ async def test_equivalent_unit_of_measurement_received_without_device_class(
     state = hass.states.get("sensor.test")
     assert state is not None
     assert state.state == "100"
+    assert (
+        state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
+        is UnitOfElectricPotential.MICROVOLT
+    )
 
     caplog.clear()
 
@@ -998,6 +1012,10 @@ async def test_equivalent_unit_of_measurement_received_without_device_class(
     state = hass.states.get("sensor.bla")
     assert state is not None
     assert state.state == "21"
+    assert (
+        state.attributes.get(ATTR_UNIT_OF_MEASUREMENT)
+        is UnitOfElectricPotential.MICROVOLT
+    )
 
 
 @pytest.mark.parametrize(