BMR Calculator
Calculate basal metabolic rate with Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle formulas.
15–120 years
Optional — enables Katch-McArdle comparison
Result
—
Enter your details, then click Calculate.
w = weight (kg), h = height (cm), a = age (years), s = +5 (male) or −161 (female). Harris-Benedict revised uses different coefficients. Katch requires body fat %.
Convert imperial units automatically.
Mifflin-St Jeor for most people; Katch if BF% is known.
Compare formulas when body fat is available; see a moderate-activity TDEE estimate.
30 years, 5'10", 170 lb, Mifflin-St Jeor.
BMR ≈ 1,737 kcal/day.
Eating only at BMR for weight loss
Fix: Target a modest deficit under TDEE instead.
Choosing Katch without body fat %
Fix: Enter BF% or switch to Mifflin/Harris.
Calculate basal metabolic rate with Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle formulas.
15–120 years
Optional — enables Katch-McArdle comparison
Result
—
Enter your details, then click Calculate.