How many calories should I eat everyday?

Anonymous
So I'm 5'3 and 120lbs. My basal metobolic rate was about 1200 or 1300 (don't quite remember) but if I'm not supposed to eat my BMR then how many calories should I eat on a day when I exercise and when I don't exercise. On a day without exercise I'm going to class and walking around a bit but when I get home I'm not doing anything. On a day when I'm active I have my classes but I'll go to the gym and do weights with some cardio. So how many calories should I eat for both of those days?
How many calories should I eat everyday?
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