I dont know how much to eat and fitbit isn't helping!

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Hey guys, I know this is a pretty common question on the forums but I have no idea how much to eat, I'm averaging about 1800-1850 cals a day ( I recently upped it) but my fitbit calorie adjustment is always about 600 calories or more (sometimes 700-800). I got it because I thought I was calculating my activity wrong. I dont think I can eat something like 2500 calories in a day! I am 155lbs and female, there must be some miscalculation. I walk about 3 miles a day, do three 5.2 mile runs per week and do 3 hours of dance classes. Thats 6 times a week but im not exactly over doing it on the exercise. Should I be eating more? its even set to lose 1/2 lb a week. Im really confused.
please help!

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