Harris-Benedict BMR calculator
Choose the version of the equation and enter your details to get the calories you burn at rest.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter sex, age, weight, height and equation version.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Revised 1984: men 88.362 + 13.397W + 4.799H − 5.677A, women 447.593 + 9.247W + 3.098H − 4.330A. Original 1919: men 66.473 + 13.7516W + 5.0033H − 6.755A, women 655.0955 + 9.5634W + 1.8496H − 4.6756A (W kg, H cm, A years).
Example
Inputs: Sex = Male, Age = 30 years, Weight = 70 kg, Height = 175 cm, Equation version = Revised (Roza and Shizgal 1984). Result: BMR: 1,696 kcal/day; For comparison: Mifflin-St Jeor: 1,649 kcal/day.
Limits and caveats
- It tends to run slightly above measured values for many people today.
- Adults only, and it ignores the split between muscle and fat.
Questions about this tool
What is the difference between the two versions?
Roza and Shizgal refitted the coefficients in 1984 on a wider data set; the results usually differ by only tens of calories.
How do I turn BMR into daily needs?
Multiply it by an activity factor from 1.2 (sedentary) to 1.9 (very active), or use the TDEE calculator.
Why is a Mifflin result shown too?
So you can compare. Mifflin-St Jeor is newer and closer to measured values for most adults.