Fitbit and Apple Health show different calories for the same day. Why?
Calories in Apple Health and Fitbit are calculated differently. Each company uses its own proprietary algorithm to calculate your calories based on factors like steps, BMR, and activities.
Our app doesn't sync calories, it only syncs Steps, Weight, and Bodyfat %. Fitbit uses this data to calculate your calories, and because it uses a different formula from Apple Health, the calories will not be exactly the same.