BMR Calculator
Free to use, with no sign up. Your entries stay in this browser; calculations run on your device.
Estimated basal metabolic rate
W = weight in kg, H = height in cm, A = age in years. Mifflin–St Jeor: 10W + 6.25H − 5A + 5 (male), or −161 instead of +5 (female). Mifflin et al., 1990.
Revised Harris–Benedict: 13.397W + 4.799H − 5.677A + 88.362 (male); 9.247W + 3.098H − 4.330A + 447.593 (female). Roza and Shizgal, 1984.
Katch–McArdle: 370 + 21.6 × W × (1 − body fat % / 100). See the equation used in this primary study of resting energy in weightlifters. An inaccurate body fat estimate affects the result.
Worked example
For a 30-year-old male weighing 80 kg at 180 cm, Mifflin–St Jeor gives 10 × 80 + 6.25 × 180 − 5 × 30 + 5 = 1,780 kcal/day estimated BMR. No activity multiplier is applied to the displayed resting result.
For the full calorie and macro form, see the Calorie Calculator.
For general information only; not medical advice. These adult formulas estimate resting energy; individual needs vary.
How to use this tool
Enter adult weight, height, age and sex used by the formula. Choose a resting-energy equation and calculate BMR in kcal per day.
Frequently asked questions
Is BMR a daily calorie target?
No. BMR estimates energy at rest. It does not include activity and is not a diet recommendation.
Is resting energy exactly the same as BMR?
BMR is measured under strict basal conditions. These equations estimate resting energy, commonly called BMR by calculators, rather than a laboratory measurement.
Does this need activity level?
No. This page displays only estimated resting energy. Use the TDEE Calculator for an activity-adjusted estimate.