Fitbit Calorie Adjustment

Hey all,

Just a quick question to those who have a Fitbit because I'm a little confused. How on earth is the calorie adjustment that pops up into my MFP exercise log calculated? I don't put much stock into the calories burned function of the Fitbit because it includes your basal metabolic rate (I presume) and, as a whole, just can't be that accurate. However, I am curious is to how this adjustment is calculated. Is it what Fitbit assumes my caloric burn would be without including BMR?

Thanks for the help!

Bug