How many calories do I need?

My lean body mass is 110lbs. I'm pretty sedetary outside of working out (desk job, couch potato at home). For my exercise, I do 4 hours of cardiovascular exercise weekly and lift 3x per week.

Is there a formula to figure caloric need based on body fat/lean body weight?

Should I average myself as sedetary and eat back some of exercise calories or consider​ myself moderately active?

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