My Apple Watch is not accurately tracking calories burned

Sometimes the estimate for calories burned may not be what you expect from a full workout. There could be a few factors in this:

  1. You may be looking at resting calories. The “Workout” app reports active calories burned. The “Activity” app displays both the active and resting calories burned during the workout. The total calories burned during the workout will include both the resting and active calories. 
  2. Apple Watch may not be in contact with your wrist. To get the most accurate heart rate measurements, make sure your Apple Watch fits snugly on top of your wrist. The heart rate sensor should stay close to your skin. Wearing Apple Watch higher up your arm (closer to your heart) may produce better results.
  3. Apple Watch may be in Low Power mode, or you've enabled Workout Power Saving Mode. Turn this off in "Watch" app, under My Watch > General.

For workouts performed on your iPhone while wearing an Apple Watch, you may want to enable Companion Mode.