BMR Calculator
Calculate your Basal Metabolic Rate — the number of calories your body burns at complete rest, just to keep you alive. Compare results across 3 formulas with full TDEE breakdown.
Your details 3 formulas
yrs
lbs
ft
in
%
Optional — enables most accurate formula for athletes—
calories/day (Mifflin-St Jeor BMR)
—
Harris-Benedict
—
Katch-McArdle
—
Average
Formula comparison
TDEE by activity level (Mifflin-St Jeor)
| Activity level | Multiplier | TDEE (cal/day) |
|---|
FAQs
What is BMR vs TDEE? ›
BMR (Basal Metabolic Rate) is the calories your body burns at complete rest — just to keep your organs functioning, breathe, and regulate temperature. It's about 60–75% of your total daily calorie burn. TDEE (Total Daily Energy Expenditure) adds the calories burned through all physical activity, from walking to exercise. TDEE = BMR × activity multiplier. When you want to lose weight, you target eating below TDEE; to gain weight, above TDEE.
Which BMR formula is most accurate? ›
The Mifflin-St Jeor equation (1990) is currently considered the most accurate for most people, with a mean accuracy of ±10%. Harris-Benedict (1918, revised 1984) tends to overestimate by 5% on average. Katch-McArdle is most accurate for lean individuals when body fat percentage is known, as it's based on lean body mass. For athletes with known body fat, use Katch-McArdle. For general use, Mifflin-St Jeor is the recommended default.