BMI/BMR Calculator

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Here you can calculate your bmi and bmr.

Choose option on the left.

The abbreviations BMI and BMR sound similar, but they stand for two separate things. Your BMI, or body mass index, is a number calculated from your height and weight which is then used to assess your body composition. Your BMR, or basal metabolic rate, is the number of calories you burn when your body is at rest. Although the two terms are independent of each other, your BMI may indirectly affect your BMR.

Body Mass Index

Your BMI is an indirect measure of your body composition -- or how much body fat you have. Although BMI doesn’t measure body fat directly, it uses your weight and height to determine whether you’re classified as underweight, normal weight, overweight or obese. This measurement correlates moderately well with other measurements of body fat such as skinfold measurements and underwater weighing, according to the Centers for Disease Control and Prevention. BMI also doesn’t adjust for age or gender. Women naturally have more body fat than men, and older people tend to have more body fat than younger people. So a sedentary older woman with low muscle mass may be overly fat, even though she has a normal BMI.

Basal Metabolic Rate

Your BMR is the number of calories your body burns at rest to do basic functions like breathing, digesting, keeping your heart beating and all the other physiological tasks that keep you alive. Your BMR is partly determined by genetics, but other factors, like your body composition and activity level, may also have an effect on your BMR. There are equations used to determine your BMR, and they differ based on whether you're a man or a woman. A woman can determine her BMR by plugging her stats into the Harris-Benedict equation: 655 + (4.35 x weight in pounds) + (4.7 x height in inches) – (4.7 x age in years). The equation for a man to calculate his BMR is as follows: 66 + (6.23 x weight in pounds) + (12.7 x height in inches) – (6.8 x age in years).