Best AnswerThe total calories burned displayed are from midnight 'till (now).
The body requires constant energy for survival, either from foods eaten or internal body fat reserves (it magically change between them). When not wearing the tracker (or not being active), the calories burned in rest are being used.
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Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
Here is an article that will help you understand more as well
BMR
http://help.fitbit.com/articles/en_US/Help_article/How-does-Fitbit-know-how-many-
calories-I-ve-burned/?q=Basil+Metabolic+Rate&l=en_US&c=Products%3AFlex&fs=Search&pn=1
Wendy | CA | Moto G6 Android
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