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Is my calorie counter accurate?

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I've been awake for about 3 hours, breakfast, no exercise or anything. I have my weight correct in the app, but my Fitbit lists that I've already burned 840 calories. Is something wrong or did I not zero it out from yesterday or something?
Feeling confused
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As well as tracking calories you burn through activity, your fitbit also tracks your BMR calories. These are the calories you burn just keeping your body alive (even when asleep). They are calculated from your profile settings (age, weight etc) so you needn't be wearing your fitbit to get them. What you are seeing is the total BMR calories since midnight. There's more information on this here:

 

http://help.fitbit.com/articles/en_US/Help_article/How-does-Fitbit-know-how-many-calories-I-ve-burne...

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