Your basal metabolic rate, or BMR, indicates how many calories your body needs to function at rest for cell growth and repair, breathing, and the operation of organ systems. BMR is dependent upon gender, height, weight and age, and accounts for about two-thirds to three-fourths of your total calorie needs. You can determine your BMR through the use of the Harris-Benedict formula. There is a different equation for men and women.
Men
Step 1
Use the following equation if you are male. BMR = 66 + (13.7 x weight in kilograms) + (5 x height in centimeters) -- (6.8 x age in years)
Step 2
Determine your weight in kilograms. If you have your weight in pounds, simply divide that number by 2.2 to convert it to kilograms. Determine your height in centimeters. If you have your height in inches simply multiply it by 2.54 to convert it to centimeters.
Step 3
Multiply your weight in kilograms by 13.7. For example if your weight is 84 kg the number would be 1,150.8. Multiply your height in centimeters by 5. For example if your height is 182.88 cm the number would be 914.4. Add your answers for these two calculations. For this example the total would be 2,065.2.
Step 4
Multiply your age in years by 6.8. So if you are 35 the number would be 238. Subtract this number from the number you calculated for Step 3. For this example it would be 2,065.2 minus 238, or 1,827.2.
Step 5
Add 66 to the number you calculated in Step 6, which for this example would be 1,893.2. Consider 1,893 your BMR or the number of calories your body needs to function at rest.
Women
Step 1
Use the following equation if you are female. BMR = 665 + (9.6 x weight in kilograms) + (1.7 x height in centimeters) -- (4.7 x age in years)
Step 2
Determine your weight in kilograms. If you have your weight in pounds simply divide that number by 2.2 to convert weight to kilograms. Determine your height in centimeters. If you have your height in inches simply multiply it by 2.54 to convert it to centimeters.
Step 3
Multiply your weight in kilograms by 9.6. For example if your weight is 66 kg the number would be 633.6. Multiply your height in centimeters by 1.7. For example if your height is 165 cm the number would be 280.5. Add your answers for these two calculations. For this example the total would be 914.1.
Step 4
Multiply your age in years by 4.7. So if you are 35 the number would be 164.5. Subtract this number from the number you calculated in Step 3. For this example it would be 914.1 minus 164.5, or 749.6.
Step 5
Add 665 to the number you calculated in Step 6, which for this example would be 1,414.6. Consider 1,415 your BMR or the number of calories your body needs to function at rest.
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