BMR Calculator

Calculate your basal metabolic rate using three formulas with activity factors.

What is a BMR Calculator?

Calculate your basal metabolic rate - the calories your body burns at rest.

Three formulas combined with activity level factors to estimate your total daily needs.

How to Calculate BMR

Follow these steps:

  • Select your preferred unit system.
  • Enter your age, gender, height, and weight.
  • Choose your activity level.
  • Click calculate to see your BMR and daily calorie needs.

Tips

  • BMR is just your resting metabolism - use TDEE for total daily needs.
  • Recalculate when your weight or activity level changes.
  • Use BMR as a baseline for setting calorie goals.

Frequently Asked Questions

What is BMR?+
Basal metabolic rate is the number of calories your body needs at complete rest to maintain basic functions like breathing, circulation, and cell production. It typically accounts for 60-75% of daily energy expenditure.
Which BMR formula is best?+
Mifflin-St Jeor is considered the most accurate for most people. Harris-Benedict tends to slightly overestimate. If you know your body fat percentage, Katch-McArdle is best.
How is BMR different from TDEE?+
BMR is calories at rest. TDEE (Total Daily Energy Expenditure) = BMR × activity factor. TDEE includes all daily activity and exercise. Use TDEE for calorie planning, not BMR alone.

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BMR Calculator — free online bmr calculator, basal metabolic rate, resting metabolism, calorie calculator, metabolism calculator. No signup required. Works in your browser.