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Where does Calories burnt come from?

‎01-29-2026 13:48

‎01-29-2026 13:48

I just got a Fitbit a week ago and notice the calories burnt is a big number. I wake up first thing in the morning and it says 500. Seems weird. Also when I go into the Fitbit app and look for data from two weeks ago, it shows calories burnt! From before I had the Fitbit! So that means the data isn’t coming from the tracker and maybe health app (iPhone). Unsure and wondering if anyone has any thoughts.

10.0.0.0.1 192.168.1.254
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‎01-29-2026 14:03

‎01-29-2026 14:03

@b1ritt5   Those calories you see when you wake up are your BMR calories.  Fitbit uses a known equation that uses your age, sex, and weight to estimate those calories.

It is a weird quirk (or possibly lazy programming) that you can see these calories in your app before you opened your account.

Laurie | Maryland
Sense 2, Luxe, Aria 2 | iOS | Mac OS

Take a look at the Fitbit help site for further assistance and information.

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