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Fitbit doesn't explicity show you your BMR calories but as these are burnt at a constant rate 24 hours a day, you can see what your calorie burn is for a 15 minute period when you are asleep and multiply that up.
As you know your BMR calories (and activity calories) depend on your profile settings for weight, age etc so it's hard to say whether yours is correct but your numbers don't sound extreme in any way.
Best AnswerYour Blaze can only "guess" how many calories you have used. So many different things involved. It would use you HR and possible your personal data like weight to determine. All trackers do this one way or another.
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