Body Tally

BMR Calculator

Calculate your Basal Metabolic Rate to find out how many calories your body burns at rest.

years
cm
kg

How to use this calculator

  1. Choose your unit system and enter sex, age, height, and weight.
  2. Submit the form to estimate your basal metabolic rate.
  3. Use BMR as the starting point for estimating total daily calorie needs.
  4. Compare BMR with TDEE if you want to account for daily activity.

Example

If your BMR is 1,650 calories per day, that is an estimate of what your body uses at rest before exercise and daily activity are included.

BMR equations are estimates. Real energy needs vary based on body composition, hormones, health status, and activity.

Frequently Asked Questions

What is BMR?

BMR (Basal Metabolic Rate) is the number of calories your body burns at rest to maintain vital functions like breathing, circulation, and cell production. It represents the minimum energy needed to keep your body functioning.

How is BMR calculated?

This calculator uses the Mifflin-St Jeor equation, which is considered one of the most accurate BMR formulas. It takes into account your sex, age, height, and weight to estimate your resting metabolic rate.

What is the difference between BMR and TDEE?

BMR is your resting metabolic rate, while TDEE (Total Daily Energy Expenditure) includes calories burned through daily activities and exercise. TDEE = BMR × activity level multiplier.

How can I use my BMR for weight management?

Your BMR helps you understand your baseline calorie needs. To lose weight, consume fewer calories than your TDEE. To gain weight, consume more. Always aim for gradual, sustainable changes and consult a healthcare provider.

Related Calculators

TDEE Calculator

Calculate total daily energy expenditure

Calorie Calculator

Plan daily calorie target

Macro Calculator

Calculate protein, fat, and carb targets

Last updated: May 27, 2026 | Reviewed by Body Tally Editorial Team

About This BMR Calculator

Use the BMR calculator to estimate how many calories your body may use at rest for basic functions such as breathing, circulation, cell repair, and temperature regulation. BMR is a starting point for calorie planning, not a complete picture of daily energy needs.

Body Tally keeps the calculator near the top of the page and adds this guide so you can understand what the tool does, how the inputs affect the result, and what the result can and cannot tell you. Health and fitness formulas are useful for planning, but they work best when treated as estimates and compared with real trends, symptoms, training history, and professional guidance when appropriate.

How to Use It

  1. Enter sex, age, height, and weight.
  2. Choose the unit system you prefer.
  3. Calculate estimated BMR.
  4. Use a TDEE calculator to include daily activity.
  5. Recalculate when body weight or activity patterns change.

How the Math Works

BMR formulas estimate resting energy needs from weight, height, age, and sex. Common equations such as Mifflin-St Jeor produce population-based estimates rather than exact measurements.

The formulas use simplified inputs so they can be calculated quickly in a browser. They do not know your medical history, medications, hormones, lab results, training recovery, sleep, stress, or diagnosis. Use the answer as a starting point, then refine it with consistent measurements and qualified advice when the decision affects health.

Interpretation Tips

  • BMR is lower than total daily energy expenditure because activity is not included.
  • Illness, medications, hormones, and body composition can affect energy use.
  • Use BMR as a baseline, then compare with real intake and progress.
  • Avoid aggressive calorie changes without professional support.

When to Pause and Get Personal Guidance

Calculator results are useful for learning and planning, but they should not be the only basis for decisions when symptoms, medications, chronic conditions, pregnancy, eating disorder history, injury, or major changes in activity are involved.

If the estimate feels surprising, repeat the measurement, check your unit settings, compare one related calculator, and read the matching guide before acting on the number. Body Tally is built to help you ask better questions, not to replace qualified care.

BMR Calculator FAQ

Is BMR the same as maintenance calories?

No. Maintenance calories include activity and are closer to TDEE.

Can BMR change?

Yes. It can change with body size, age, body composition, and health status.

Is the estimate exact?

No. It is a formula-based estimate.