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BMR Calculator

Find out how many calories your body burns at rest — and how many you need each day based on your activity level.

Basal Metabolic Rate

Basal Metabolic Rate
— kcal/day
At rest
calories burned doing nothing
Your TDEE
—
kcal / day
Activity calories
—
kcal / day above BMR

TDEE at every activity level

Uses the Mifflin–St Jeor equation (1990), the most validated formula for estimating BMR in the general population. TDEE = BMR × activity multiplier.

Put your BMR to work

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What is BMR?

Your Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic functions — breathing, circulation, cell production — while completely at rest. It accounts for roughly 60–75% of total daily calorie burn for most people.

BMR is not the same as TDEE (Total Daily Energy Expenditure). Your TDEE includes the calories burned through daily movement and exercise on top of your BMR. Eating at your TDEE maintains your current weight; eating below it creates a deficit for weight loss.

This calculator uses the Mifflin–St Jeor equation, which is considered the most accurate formula for estimating BMR in most adults.