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How does Fitbit know how many calories I've burned?

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Your tracker and dashboard show an estimated number of calories burned based on your BMR (Basal Metabolic Rate), which we calculate using the height, weight, age, and gender information that you provided when you set up your Fitbit account. If your tracker measures heart rate, the calorie burn estimate also takes heart rate into account. Note that calorie tracking for the following day begins at midnight and incorporates the calories you burn while sleeping.

When you sync your tracker, Fitbit replaces your estimated calorie burn with your tracker's data. If you manually log activities, the calories burned during those activities are taken into account as well.

 
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Last updated: March 16, 2015
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