The BMR formula uses your height, weight, age and gender to calculate your Basal Metabolic Rate.
This formula was originally created as a tool for measuring the thyroid status of humans by comparing the metabolic rate of animals to that of humans. But now, the BMR is used as a measure of an adult's metabolism, which changes with height, weight, age and a variety of medical factors.
English BMR Formula
BMR Women: (447.6 + (9.2 x (weight*/2.2)) + (3.1 x (height*/0.39)) - (4.3 x age in years))
BMR Men: (88.3 + (13.4 x (weight*/2.2)) + (4.8 x (height*/0.39)) - (5.7 x age in years))
* weight in pounds and height in inches.
Metric BMR Formula
BMR Women: = (447.6 + (9.2 x weight*) + (3.1 x height*) - (4.3 x age in years))
BMR Men: (88.3 + (13.4 x weight*) + (4.8 x height*) - (5.7 x age in years))
* weight in kilos and height in cm.
The Mifflin & St Jeor Formula
BMR only represent resting energy expenditure, and adjustment must be made to calculate your total calorie intake required to maintain your current weight.
To calculate your total daily calorie needs, multiply your BMR by the appropriate activity factor, as follows:
|Activity Level||Activity Factor|
Light or no exercise and desk job
|BMR x 1.2|
Light exercise or sports 1-3 days a week
|BMR x 1.375|
Moderate exercise or sports 3-5 days a week
|BMR x 1.55|
Hard exercise or sports 6-7 days a week
|BMR x 1.725|
Hard daily exercise or sports and physical job
|BMR x 1.9|
In order to lose weight safely, try not to lose more than 2 pounds a week.
If only overweight or obesity puts your health in danger, you may apply to quick weight loss, but only if your doctor permits.
BMR calculation Examples
An example of calculating the basal metabolic rate using the English system for the formula:
- Gender = Woman
- My age = 28 years
- My Weight = 143 pounds.
- My Height = 5'5" (65 inches)
BMR = (447.6 + (9.2 x (143 /2.2)) + (3.1 x (65 /0.39)) - (4.3 x 28))
BMR = 1,442 Calories / day
An example of calculating BMR using the metric system for the formula:
- Gender = Male
- My age = 38 years
- My Height = 175 cm
- My Weight = 75 kg
BMR = (88.3 + (13.4 x 75) + (4.8 x 175) - (5.7 x 38))
BMR = 1717 Calories / 24 hours
Now, i can multiply my BMR by my Activity Factor (x1.375) to calculate the calories i need to maintain my weight:
Calories needed to maintain my weight = 1717 x 1.375 = 2361 calories
Calculate your BMR
If you're trying to lose, maintain, or gain weight, it's a good idea to start by calculating your Basal Metabolic Rate (BMR).
You can calculate your BMR now with our “Basal Metabolic Rate calculator” to know the number of calories burned while resting.