Versa 4 track calories burned at night?

[Monial]

How is it possible that even if I don't wear the Fitbit versa 4 during the night, it count calories? 

Moderator edit: clarified subject.

[Guy_]

Hi @Monial - you burn calories all the time and the app attempts to show you normal usage, either based on your attributes over the time from midnight or if wearing it over that period based on your sleep and activitiy.

[Monial]

Even if I do not wear the smartwatch in the night? Because I do not use it in the night but it say to me that I have burnt more then 300kcal 

[Guy_]

@Monial - as mentioned, yes.

[ManuFitbit]

Hi @Monial. A warm welcome to the forums.

Thank you for sharing the inquiry regarding calories. 

I'd like to add to the helpful information provided by @Guy_  that Fitbit devices combine your basal metabolic rate (BMR)—the rate at which you burn calories at rest to maintain vital body functions (including breathing, blood circulation, and heartbeat)—and your activity data to estimate your calories burned. If your device tracks heart rate, your heart-rate data is also included, especially to estimate calories burned during exercise. The number you see on your Fitbit device is your total calories burned for the day.

Yes, even if you don't wear your watch at night. Your BMR is based on the physical data you entered in to your Fitbit account (height, weight, sex, and age) and accounts for at least half the calories you burn in a day. Because your body burns calories even if you’re asleep or not moving, you see calories burned on your device when you wake up and will notice this number increase throughout the day.

Thanks @Guy_ for providing this accurate information.