BMR Calculator
Estimate the energy used by the body at rest.
Uses the Mifflin–St Jeor equation.
How to use this calculator
- Enter age, equation sex, weight, and height.
- Review the live result and use Copy result when you need to share it.
How the calculation works
The Mifflin–St Jeor equation combines weight, height, age, and a sex-specific constant.
Formula
The Mifflin–St Jeor equation combines weight, height, age, and a sex-specific constant.
Step-by-step calculation
- Enter age, equation sex, weight, and height.
- The Mifflin–St Jeor equation combines weight, height, age, and a sex-specific constant.
- Check the displayed result, then copy it if needed.
Worked example
A 35-year-old woman at 70 kg and 170 cm has a BMR estimate around 1,440 kcal/day.
Risk guidance
Frequently asked questions
Does this tool send my inputs anywhere?
No. The interactive calculation runs in your browser and this site does not submit tool inputs to a backend.
How should I use the result?
Check that the entered units and values match your situation, especially around dates, breaks, and rounding.
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