BMR Calculator

Estimate your basal metabolic rate from sex, age, height, and weight.

Health Direct route, no hidden menu

Result

Estimated BMR

0 kcal/day

Formula

Mifflin-St Jeor

How It Works

BMR estimates the calories your body uses at rest for basic functions such as breathing, circulation, and temperature regulation. This calculator uses the Mifflin-St Jeor equation with sex, age, height, and weight to produce a daily calorie estimate.

Example

A 30-year-old male at 170 cm and 70 kg has an estimated BMR of about 1,618 kcal/day. This is a resting estimate, not a full daily calorie target unless activity is added separately.

How to use BMR responsibly

Treat it as a starting estimate, not a diagnosis.
Compare it with TDEE before planning calories.
Track real-world weight and energy changes over time.
Consult a qualified professional for medical or eating-disorder concerns.

Inputs that affect the result

Weight and height drive much of the estimate.
Age lowers estimated BMR over time in the formula.
Sex changes the formula constant.
Body composition is not directly measured by this calculator.

Frequently Asked Questions

What is BMR?

BMR is basal metabolic rate: an estimate of energy used at rest for basic body functions.

Which formula does this use?

This calculator uses the Mifflin-St Jeor equation, a common adult estimate.

Is BMR my maintenance calories?

No. Maintenance calories usually require adding activity on top of BMR, which is what a TDEE calculator estimates.

Can medical conditions change BMR?

Yes. Health status, medications, body composition, age, pregnancy, and other factors can affect real energy needs.