Your average Net calories per day?

Emsie_lou

I am confused about this net calorie and how much I should be having a day. Should my Net calorie be a set limit like 1200 calories or does it matter?
Today for example I have consumed about 1500 calories but burnt 410 at the gym which has left me with a net calorie for the day of 1100. Some days my net calories is only 800 but I am consuming the same 1500 calories just burning them off with exercise.
So should I up my calories so my net calories go up or is what I am doing ok?