How to use this calculator
W is kilograms, H is centimeters, and A is years. Select the equation to compare population-based adult resting-energy estimates. Often called a BMR calculator, these predictions do not measure basal metabolism. Different equations can give different answers for the same measurements.
- Enter age (years), equation coefficient, measurement system and review the remaining options.
- Select Calculate or change a value to update the result. Read the result label and units before copying.
- Use Reset to restore the worked starting values.
Formula and method
An adult resting-energy estimate, not measured basal metabolism or a recommended calorie intake.
Worked example
70 kg, 175 cm, age 30, male coefficient gives 1,648.75 kcal/day.
Questions about bmr calculator
Is BMR the same as daily calorie needs?
No. Choose Mifflin–St Jeor, revised Harris–Benedict (1984), or Katch–McArdle with a body-fat input to estimate resting energy. Calorie Needs adds a selected activity factor. These equations do not measure your metabolism or provide an individual diet prescription.
Choose the tool for your question
- BMI: Calculate weight relative to height, without estimating calorie needs.
- Calorie Needs: Include an activity multiplier in a daily maintenance-energy estimate.
What assumptions should I check?
An adult resting-energy estimate, not measured basal metabolism or a recommended calorie intake.
Are my inputs saved?
Calculations run in your browser. We store only tool IDs for favorites and recent tools. Sharing inputs in links is disabled for this category.
Health tools provide general estimates, not diagnoses or personal medical advice. BMI offers a labeled CDC child/teen reference; adult screening bands must not be applied to children. Discuss health and exercise decisions with a qualified professional. Read the tool-specific sources below for background on the method.