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BMR Calculator – Estimate Your Basal Metabolic Rate

Estimate how much energy your body uses at rest. Enter your age, height and weight, then choose metric or imperial units.

My tools →
years

Estimated basal metabolic rate (BMR)

–

kcal per day

This is a general estimate for adults, not medical advice. Individual energy needs vary.

Runs in your browser – your data never leaves your device Also available via our free API

How to use the BMR Calculator

  1. 1 Choose metric or imperial units.
  2. 2 Enter your age, height and weight, then select the sex coefficient used in the equation.
  3. 3 Read the estimated resting energy use in kilocalories per day.

What is BMR?

Basal metabolic rate (BMR) estimates the energy your body needs to maintain basic functions while at rest. These functions include breathing, circulation and maintaining body temperature. BMR is only one part of daily energy use; movement, exercise and digestion require additional energy.

How this BMR calculator works

This calculator uses the Mifflin–St Jeor equation. It estimates resting energy using weight, height, age and a male or female equation coefficient. The calculator converts pounds and inches to metric units when you select imperial measurements. The original study developed equations to predict resting energy expenditure in healthy adults (study record on PubMed).

The result is an estimate rather than a direct measurement. Individual energy use can vary with body composition, health, medications and other factors. A calculator cannot measure your metabolism or account for every aspect of your health.

BMR compared with TDEE

BMR estimates energy use at rest. Total daily energy expenditure (TDEE) also includes everyday movement and exercise, so it is usually higher. If you want to estimate energy use across a typical day, use a TDEE calculator and select an activity level.

Use this estimate thoughtfully

This tool provides general information for adults, not a diagnosis or an individualized diet plan. Energy needs differ during growth, pregnancy, illness and recovery. For personalized nutrition or health advice, speak with a qualified healthcare professional.

Frequently asked questions

What does BMR mean?

BMR means basal metabolic rate. It estimates the energy your body uses to maintain basic functions while at rest.

Which formula does this BMR calculator use?

It uses the Mifflin–St Jeor equation, which estimates resting energy from age, height, weight and a sex coefficient.

Is BMR the same as daily calorie needs?

No. BMR estimates energy use at rest. Daily energy expenditure also includes movement, exercise and digestion.

How accurate is this BMR estimate?

It is an estimate, not a measurement. Actual energy use varies between people and can be affected by body composition, health and other factors.

Who can use this calculator?

It is intended for adults. People who are pregnant, growing, unwell or recovering should seek personalized guidance from a qualified healthcare professional.

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