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BMR Calculator
Find out how many calories your body burns at rest using two clinically validated equations, all computed in your browser.
HOW TO USE
- 1Enter your age (10–120).
- 2Select your gender.
- 3Enter your weight in kg or lb.
- 4Enter your height in cm or ft.
- 5Your BMR from both equations updates live in the results.
EXAMPLE
INPUT
Age: 30 · Male · Weight: 80 kg · Height: 180 cm
OUTPUT
Mifflin-St Jeor: 1,780 kcal/day Harris-Benedict: 1,854 kcal/day
FAQ
What is BMR?
Basal Metabolic Rate is the number of calories your body needs to perform basic life-sustaining functions like breathing, circulation, and cell production while at complete rest.
Which equation is more accurate?
Mifflin-St Jeor is generally considered the most accurate for most people. Harris-Benedict tends to overestimate BMR by 5 to 15%.
How is BMR different from TDEE?
BMR is your calorie burn at rest. TDEE (Total Daily Energy Expenditure) accounts for your activity level. Multiply BMR by an activity factor to estimate TDEE.
Why is my BMR so high/low?
BMR depends on age, gender, weight, and height. Muscle mass also affects it — more muscle means higher BMR. These equations are estimates; individual variation exists.