@HJP the number it shows you can eat has already accounted for the caloric deficit. For instance, you said you want a -500 deficit, so if Fitbit says you can eat 2,300 calories what it has done is taken your caloric burn that it estimated (2,800) and subtracted the deficit you selected (-500) so it shows you can eat 2,300 calories that day (assuming you do no additional exercise). If you do additional exercise or were just active that day it will bump up what you can eat. Fitbit (and others like MFP) adjust the amount you can eat so you always stay at roughly a consistent -500 (or whatever you selected) deficit for slow/smooth weightloss.
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