Calories Burned WAY off from Fitbit

Hello,
I'm super curious about the accuracy of the calories burned in Cronometer.

It is, on average, typically 400-500 more than the calories burned in Fitbit. For example, yesterday on January 24th, Fitbit says I burned 2041, whereas Cronometer says I burned 2526.

I think it is because of the activity level I have set.

Cronometer imports my activity and exercise from Fitbit automatically.

Is my activity level off? Do these apps simply use different calculations?

Here are some screenshots of the last few days, to show examples:





Also, how do you graph your Calories Burned in Cronometer Trends?

Thanks!
–gg

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