Will Resetting Calibration on Apple Watch Do?

Calibrating your Apple Watch for improved Workout and Activity accuracy. You can calibrate your Apple Watch to improve the accuracy of your distance, pace, and calorie measurements. Calibrating your watch can also help it learn your fitness level and stride, which improves accuracy when GPS is limited or unavailable.

What happens when I reset my calibration data on my Apple Watch?

If you're finding that the Apple Watch is really struggling to report accurate activity, you might want to start from scratch and reset your calibration data. This won't delete previous data, but it will set the accelerometer back to factory settings, essentially.

Will I lose data if I calibrate my Apple Watch?

On your iPhone, in the Watch app, go to: My Watch (tab) > Privacy > Motion & Fitness > Reset Calibration Data. Resetting calibration data does not remove any historic Activity or Health data.