Hi
Some users have reported receiving lower, more accurate estimations for Active Energy (calories / kilojoules) after updating from earlier versions of watchOS (Apple Watch operating system software). If you have recently updated watchOS, this may account for the difference.
More generally, the following steps may help your watch to deliver more accurate results:
Check that your personal information is accurate:
- On your iPhone, in the Watch app, go to: My Watch (tab) > Health > check and, if necessary, edit your birthdate, gender, height and weight.
Check your privacy settings:
- On your iPhone, in the Watch app, go to: My Watch (tab) > Privacy > Motion & Fitness > check that Heart Rate and Fitness Tracking are both enabled.
For the best results from the heart rate sensor (data from which is used when estimating calories), check that you are wearing your watch snugly on the top of your wrist during workouts:
- Apple suggests that you consider tightening your watch band before workouts and loosening it again afterwards.
Calibrate your Apple Watch (instructions via link below):
- Calibration can help to improve the accuracy of various health and activity-related estimations including:
- Calorie estimations for workouts when using the Workout app.
- Calorie, distance, Move and Exercise estimations in the Activity App.
- It may help to reset your calibration data and start afresh:
- On your iPhone, in the Watch app, go to: My Watch (tab) > Privacy > Motion & Fitness > tap on Reset Calibration Data.
More information:
Calibrating your Apple Watch for improved Workout and Activity accuracy - Apple Support
Use the Activity app on your Apple Watch - Apple Support
Use the Workout app on your Apple Watch - Apple Support
