Calibrating your Apple Watch for improved accuracy
Edited
Tip: Your Apple Watch uses your personal information — such as your height, weight, gender, and age — to calculate how many calories you burn and more. Calibrate your Apple Watch to improve the accuracy of your distance, pace, and calorie measurements.
While wearing your Apple Watch, go to a flat, open outdoor area that offers good GPS reception and clear skies
Open the Workout app, then tap Outdoor Walk or Outdoor Run
Walk or run at your normal pace for about 20 minutes
Apple Support
🔗 Get the most accurate measurements using your Apple Watch
🔗 Calibrating your Apple Watch for improved Workout and Activity accuracy