How accurate is this BMR Calculator?

Our calculator uses scientifically validated formulas and provides results based on peer-reviewed research. Results should be used as a general guide and not as medical advice.

Is this tool free to use?

Yes, this BMR Calculator is completely free to use. No registration or payment required.

Can I use this calculator on mobile?

Yes, our calculator is fully responsive and works on all devices including smartphones, tablets, and desktop computers.

BMR Calculator

Calculate your Basal Metabolic Rate - calories your body burns at rest

BMR Calculator

Calculate your Basal Metabolic Rate - the calories you burn at rest

Age

years

Gender

Height

Weight

Formula

Mifflin-St Jeor Most accurate for most people Recommended

Harris-Benedict Original formula from 1918

Katch-McArdle Best for athletes (needs body fat %)

Body Fat Percentage

Required for Katch-McArdle formula

Your Basal Metabolic Rate

calories/day

This is the number of calories your body burns at rest to maintain vital functions like breathing, circulation, and cell production.

Daily Calorie Needs by Activity Level

Sedentary Little or no exercise -- cal

Light 1-3 days/week -- cal

Moderate 3-5 days/week -- cal

Active 6-7 days/week -- cal

Very Active Hard + physical job -- cal

Understanding Your BMR

BMR accounts for 60-75% of your total daily energy expenditure
Muscle burns more calories than fat, even at rest
BMR naturally decreases with age (about 2% per decade after 20)
Never eat below your BMR - this can slow your metabolism

BMR calculations are estimates. Individual metabolism varies based on genetics, hormones, body composition, and other factors. Consult a healthcare professional for personalized advice.

Basal Metabolic Rate

BMR is the minimum calories your body needs at rest.