It's entirely possible to have too much of a good thing, which is why healthy eating plans focus on portion control as well as choosing healthy foods. It's not a simple calculation, because the number of calories you need varies: Men require more than women do, and your age, body weight and activity.
Estimates range from 1,600 to 2,400 calories per day for adult women and 2,000 to 3,000 calories per day for adult men. Within each age and sex category, the low end of the range is for sedentary individuals; the high end of the range is for active individuals.
Male: 4-8 9-13 14-18 19-30 31-50 51+ and weight for ages up to age 18 years of age and median height and weight for that height to give a BMI of 21.5 for adult females and 22.5 for adult males.
The use of a calorie calculator is most helpful when you are trying to figure out how many calories to eat per day. Almost every calorie calculator will take your gender into account, in addition to your weight and your activity level. Why? Because a man's body will generally require more energy (in the form of calories) even when it is the same size as a woman's.