About the BMR Calculator

Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions like breathing and circulation while at complete rest.

Formula Used

Men: BMR = 10×weight(kg) + 6.25×height(cm) - 5×age + 5 Women: BMR = 10×weight(kg) + 6.25×height(cm) - 5×age - 161

How It Works

This calculator uses the Mifflin-St Jeor equation, one of the most widely trusted formulas for estimating BMR from your age, gender, height, and weight.

Step by Step

Enter your weight in kilograms and height in centimetres.
Enter your age in years and select your gender.
The formula combines these into your estimated resting calorie burn.

Worked Example

Example: A 28-year-old woman, 160 cm tall, 60 kg:

BMR = (10×60) + (6.25×160) - (5×28) - 161 = 600 + 1000 - 140 - 161 = 1299 kcal/day

Frequently Asked Questions

Is BMR the same as calories I should eat?

No, BMR only covers calories burned at rest. Add activity on top of BMR (see our TDEE Calculator) to know your full daily calorie needs.

Why does BMR differ between men and women?

Men generally have more muscle mass, which burns more calories at rest, so the formula accounts for this with separate constants.

Does BMR decrease with age?

Yes, BMR typically declines gradually with age due to loss of muscle mass and changes in hormone levels.

CALCULATOR EXPERT

BMR Calculator