BMR Calculator
Find the calories your body burns at rest.
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About the BMR Calculator
Your basal metabolic rate (BMR) is the number of calories your body burns just to keep you alive at complete rest. Enter your sex, age, height, and weight and the calculator uses the Mifflin-St Jeor equation — the most accurate modern formula — to estimate your BMR. It's the foundation for setting calorie goals: multiply it by an activity factor (or use the TDEE Calculator) to get your daily maintenance calories.
How to use the BMR Calculator
- 01Enter your sex, age, height, and weight.
- 02Read the result instantly — it recalculates as you type.
- 03Adjust the numbers to model different scenarios.
Frequently asked questions
What is BMR?
Basal metabolic rate — the calories your body needs at rest for basic functions like breathing and circulation, typically 60–70% of total daily burn.
How is BMR calculated?
This tool uses the Mifflin-St Jeor equation: 10×kg + 6.25×cm − 5×age + 5 (men) or − 161 (women).