Calculators · FREE

BMR Calculator

Estimate basal metabolic rate. Processing for supported tools happens locally in your browser.

This is a general estimate for information only, not medical advice or a diagnosis.

About BMR Calculator

Use this browser-based utility for everyday tasks. Review output before relying on it and retain a copy of important originals.

Read the BMR Calculator guide →

About BMR Calculator

Basal metabolic rate (BMR) is a formula-based estimate of energy used at rest. This calculator uses age, height, weight, and a sex coefficient to provide a general estimate in kilocalories per day.

How to use BMR Calculator

  1. Select the sex used by the formula.
  2. Enter your age in years.
  3. Enter your weight and choose kilograms or pounds, then your height and choose centimetres, inches, feet or feet and inches.
  4. Choose Calculate to see the estimated daily BMR.
  5. Use the result only as a starting point for general information.

Units and limits

Choose the weight unit (kilograms or pounds) and the height unit (centimetres, inches, feet or feet and inches) next to the boxes, and the tool converts the numbers for you. The formula is meant for healthy adults, and it can be misleading for children, pregnant or breastfeeding women, athletes and people with medical conditions. Ask a doctor or a registered dietitian for advice about your own situation.

Frequently asked questions

Which formula does the calculator use?

The Mifflin-St Jeor equation, with +5 for men and -161 for women.

Is BMR the number of calories I should eat?

No. It is only the estimated energy used at rest. How much to eat depends on your activity, health and goals, so ask a professional.

Can I enter pounds or feet?

Yes. Choose pounds next to the weight box and inches, feet or feet and inches next to the height box. The tool converts them.

Why does a smartwatch give a different number?

Different devices and calculators use different formulas and assumptions, and all of them are estimates.

More Calculators tools

Want more detail, examples and answers to common questions? Read the BMR Calculator guide.

About BMR Calculator

Basal metabolic rate (BMR) is a formula-based estimate of energy used at rest. This calculator uses age, height, weight, and a sex coefficient to provide a general estimate in kilocalories per day.

How to use BMR Calculator

  1. Select the sex used by the formula.
  2. Enter your age in years.
  3. Enter your weight and choose kilograms or pounds, then your height and choose centimetres, inches, feet or feet and inches.
  4. Choose Calculate to see the estimated daily BMR.
  5. Use the result only as a starting point for general information.

Units and limits

Choose the weight unit (kilograms or pounds) and the height unit (centimetres, inches, feet or feet and inches) next to the boxes, and the tool converts the numbers for you. The formula is meant for healthy adults, and it can be misleading for children, pregnant or breastfeeding women, athletes and people with medical conditions. Ask a doctor or a registered dietitian for advice about your own situation.

Frequently asked questions

Which formula does the calculator use?

The Mifflin-St Jeor equation, with +5 for men and -161 for women.

Is BMR the number of calories I should eat?

No. It is only the estimated energy used at rest. How much to eat depends on your activity, health and goals, so ask a professional.

Can I enter pounds or feet?

Yes. Choose pounds next to the weight box and inches, feet or feet and inches next to the height box. The tool converts them.

Why does a smartwatch give a different number?

Different devices and calculators use different formulas and assumptions, and all of them are estimates.

More Calculators tools

Want more detail, examples and answers to common questions? Read the BMR Calculator guide.