Body Mass Index is a measure of your body fat based on your height, weight and gender. A BMI between 18.5 to 24.9 means you're at a healthy weight.
Basal Metabolic Rate
If you are at a healthy weight, chances are you want to stay that way. The basal metabolic rate formula calculates how many calories your body uses while you are at rest.
BMR Formula
The BMR formula for a female is BMR = 655 + 4.35 x weight in lb. + 4.7 x height in inches - 4.7 x age in years. For a man, the BMR formula is BMR = 66 + 6.23 x weight in lb. + 12.7 x height in inches - 6.8 x age in year.
Harris Benedict Equation
The Harris Benedict equation multiplies your activity level with your BMR and comes up with the number of calories you need to take in just to maintain your current weight.
Formula
According to the Harris Benedict equation, to calculate how many calories to consume to maintain your weight if you are inactive, multiply your BMR by 1.2.
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