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BMR Calculator

Calculate your Basal Metabolic Rate using both the Mifflin-St Jeor and Harris-Benedict equations.

BMR Results

About the BMR Calculator

BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest just to maintain vital organ functions — breathing, circulation, cell production, and temperature regulation.

How to Use

  1. Select your unit system (Imperial or Metric).
  2. Enter your age, gender, height, and weight.
  3. Click Calculate BMR.
  4. Both Mifflin-St Jeor and Harris-Benedict results are shown for comparison.

How It Works

Mifflin-St Jeor (recommended):
Men: BMR = 10W + 6.25H − 5A + 5
Women: BMR = 10W + 6.25H − 5A − 161
(W = weight kg, H = height cm, A = age)

Harris-Benedict (revised 1984):
Men: BMR = 88.362 + 13.397W + 4.799H − 5.677A
Women: BMR = 447.593 + 9.247W + 3.098H − 4.330A

Example

Male, 30 years, 175 cm, 75 kg:
Mifflin: 10×75 + 6.25×175 − 5×30 + 5 = 1,756 cal/day
Harris-Benedict: 88.36 + 13.4×75 + 4.8×175 − 5.68×30 = 1,840 cal/day

Frequently Asked Questions

Research generally shows the Mifflin-St Jeor equation is more accurate for most people. A 2005 study found it had the smallest mean difference from measured resting metabolic rate. Harris-Benedict tends to overestimate slightly for overweight individuals.
BMR is calories burned at absolute rest. TDEE (Total Daily Energy Expenditure) multiplies BMR by an activity factor (1.2–1.9) to account for movement, exercise, and non-exercise thermogenesis.
Eating significantly below your BMR for extended periods can be harmful. It can lead to muscle loss, nutrient deficiencies, and metabolic adaptation. Most dietitians recommend never going below BMR without medical supervision.