diff --git a/homeassistant/components/garmin_connect/const.py b/homeassistant/components/garmin_connect/const.py
index ae1c2f1caa1..3b8d99c486a 100644
--- a/homeassistant/components/garmin_connect/const.py
+++ b/homeassistant/components/garmin_connect/const.py
@@ -1,5 +1,10 @@
 """Constants for the Garmin Connect integration."""
-from homeassistant.const import DEVICE_CLASS_TIMESTAMP, TIME_MINUTES, UNIT_PERCENTAGE
+from homeassistant.const import (
+    DEVICE_CLASS_TIMESTAMP,
+    MASS_KILOGRAMS,
+    TIME_MINUTES,
+    UNIT_PERCENTAGE,
+)
 
 DOMAIN = "garmin_connect"
 ATTRIBUTION = "Data provided by garmin.com"
@@ -309,12 +314,12 @@ GARMIN_ENTITY_LIST = {
         DEVICE_CLASS_TIMESTAMP,
         False,
     ],
-    "weight": ["Weight", "kg", "mdi:weight-kilogram", None, False],
+    "weight": ["Weight", MASS_KILOGRAMS, "mdi:weight-kilogram", None, False],
     "bmi": ["BMI", "", "mdi:food", None, False],
     "bodyFat": ["Body Fat", UNIT_PERCENTAGE, "mdi:food", None, False],
     "bodyWater": ["Body Water", UNIT_PERCENTAGE, "mdi:water-percent", None, False],
-    "bodyMass": ["Body Mass", "kg", "mdi:food", None, False],
-    "muscleMass": ["Muscle Mass", "kg", "mdi:dumbbell", None, False],
+    "bodyMass": ["Body Mass", MASS_KILOGRAMS, "mdi:food", None, False],
+    "muscleMass": ["Muscle Mass", MASS_KILOGRAMS, "mdi:dumbbell", None, False],
     "physiqueRating": ["Physique Rating", "", "mdi:numeric", None, False],
     "visceralFat": ["Visceral Fat", "", "mdi:food", None, False],
     "metabolicAge": ["Metabolic Age", "", "mdi:calendar-heart", None, False],
diff --git a/homeassistant/components/isy994/sensor.py b/homeassistant/components/isy994/sensor.py
index d3a889902f5..c8c427a5bf5 100644
--- a/homeassistant/components/isy994/sensor.py
+++ b/homeassistant/components/isy994/sensor.py
@@ -6,6 +6,7 @@ from homeassistant.components.sensor import DOMAIN
 from homeassistant.const import (
     CONCENTRATION_PARTS_PER_MILLION,
     LENGTH_KILOMETERS,
+    MASS_KILOGRAMS,
     POWER_WATT,
     SPEED_KILOMETERS_PER_HOUR,
     SPEED_METERS_PER_SECOND,
@@ -55,7 +56,7 @@ UOM_FRIENDLY_NAME = {
     "25": "index",
     "26": "K",
     "27": "keyword",
-    "28": "kg",
+    "28": MASS_KILOGRAMS,
     "29": "kV",
     "30": "kW",
     "31": "kPa",
diff --git a/homeassistant/components/smartthings/sensor.py b/homeassistant/components/smartthings/sensor.py
index da581bb969e..b25b89ac9cf 100644
--- a/homeassistant/components/smartthings/sensor.py
+++ b/homeassistant/components/smartthings/sensor.py
@@ -41,7 +41,7 @@ CAPABILITY_TO_SENSORS = {
         Map(Attribute.battery, "Battery", UNIT_PERCENTAGE, DEVICE_CLASS_BATTERY)
     ],
     Capability.body_mass_index_measurement: [
-        Map(Attribute.bmi_measurement, "Body Mass Index", "kg/m^2", None)
+        Map(Attribute.bmi_measurement, "Body Mass Index", f"{MASS_KILOGRAMS}/m^2", None)
     ],
     Capability.body_weight_measurement: [
         Map(Attribute.body_weight_measurement, "Body Weight", MASS_KILOGRAMS, None)