The number of calories a you need to stay alive depends on your age, height, weight and activity level. It is easy to calculate using the basal metabolic rate formula and the Harris Benedict equation.
Staying Alive
Everything you do uses calories, even breathing and digesting your food. The way to figure out how many calories you need to stay alive depends on your activity level. If you are very active you will need far more calories than if you are sedentary. The calories your body burns just to keep you alive is called your basal metabolic rate. This resting metabolic rate is based on how many calories you would burn if you just lay on the floor all day.
BMR
To figure BMR for women, the formula is: 655 + (4.35 x weight in pounds) + (4.7 x height in inches) -4.7 x age in years). An 18-year-old woman who is 5 feet tall and weighs 110 lbs. would have a BMR of 1,330.9. The formula for men is: 66 + (6.23 x weight in pounds) + 12.7 x height in inches) - (6.8 x age in years). A 65 year-old man who is 6 feet, 2 inches, weighing 200 lbs. would have a BMR of 1,809.8.
Harris-Benedict Equation
The Harris Benedict Equation assumes you will have more activity than just lying around all day. To figure calories needed if you are sedentary, multiply BMR by 1.2; if you are lightly active, multiply by 1.375; moderately active, multiply by 1.55; very active, 1.725; if you are extremely active, multiply by 1.9.
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