How many calories should someone trying to gain weight eat?

Let me exlainp: You have to give your weight and age to determine the average calories you need. You need 2038 calories/day to maintain your weight you need 1538 calories/day to lose 1 lb per week you need 1038 calories/day to lose 2 lb per week you need 2538 calories/day to gain 1 lb per week you need 3038 calories/day to gain 2 lb per week those number based 0n 160 pound weight.