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Health · BMR

BMR Calculator

Estimate basal metabolic rate — calories burned at rest.

BMR Calculator

Choose your sex and unit system, enter your age, height, and weight, then select Calculate.

How this is calculated

This uses the Mifflin-St Jeor equation, the formula most commonly recommended by dietitians today: Men: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age + 5 Women: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age − 161 Below the BMR result, estimated total daily calorie needs are also shown at five standard activity levels — BMR multiplied by an activity factor from 1.2 (sedentary) to 1.9 (extra active).

Examples

A 25-year-old man, 175 cm tall, weighing 70 kg, has a BMR of about 1,674 calories per day. A woman with the same measurements has a BMR of about 1,508 calories per day. At a lightly active level, that same 25-year-old man needs about 2,301 calories per day to maintain his weight.

About this calculation

BMR is the number of calories your body needs at complete rest just to maintain basic functions — it doesn't include any activity. The Mifflin-St Jeor equation (1990) is widely regarded as more accurate than older formulas for most adults.

Related tools

More calculators are on the way — browse everything planned on the Home page.

Frequently asked questions

What's the difference between BMR and daily calorie needs?

BMR is calories burned at complete rest. Your actual daily calorie needs are higher, since they also account for activity, digestion, and movement throughout the day.

Why does the calculator say my input is invalid?

Age, height, and weight must all be positive numbers — check that you've filled in every visible field for your chosen unit system.

What are the activity levels based on?

They're the standard Harris-Benedict/Mifflin activity multipliers used throughout nutrition science: BMR is multiplied by a factor from 1.2 (little or no exercise) up to 1.9 (very hard exercise or a physical job) to estimate the calories needed per day to maintain your current weight at that activity level.