BMR Calculator
Estimate basal metabolic rate using the Mifflin-St Jeor equation.
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Estimate basal metabolic rate using the Mifflin-St Jeor equation.
This is a population estimate, not personalised medical or nutrition advice.
How to use this calculator
Enter your values above and the result updates instantly. You can change the inputs as often as you like, and use Reset to restore the example values.
About the result
Estimate basal metabolic rate using the Mifflin-St Jeor equation. The calculation runs in your browser; the values you enter are not sent to this website.
What the BMR Calculator does
Estimate basal metabolic rate using the Mifflin-St Jeor equation. It is designed for understanding a general health or activity estimate from the measurements you provide. The calculator uses the values you enter to produce estimated bmr without sending your information to the server.
This page is most useful when you want a quick answer and a repeatable way to compare alternatives. Change one input at a time to see which factor has the greatest effect.
How the calculation works
The calculation starts with sex used by equation, weight, height and age. It applies the relevant health relationship to calculate estimated bmr. Results update in your browser whenever an input changes.
Inputs used
- Sex used by equation
- Weight
- Height
- Age
Results provided
- Estimated BMR
Practical tip: Use recent, accurately measured inputs and treat the output as one indicator rather than a diagnosis.
Example bmr calculator setup
The calculator opens with the example values below. They demonstrate the expected format and give you a starting point before entering your own figures.
- Sex used by equation
- male
- Weight
- 75 kg
- Height
- 175 cm
- Age
- 35 years
After entering the values, review estimated bmr in the results panel. Use Reset whenever you want to return to this example.
Understanding your result
Read the result alongside the inputs that produced it. A precise-looking number is still only as useful as the information entered. For comparisons, keep every input the same except the one factor you want to test.
This tool is for general information only and is not a substitute for medical advice, diagnosis or treatment. The tool rounds displayed answers where appropriate, while the underlying browser calculation retains greater precision.
Frequently asked questions
What information do I need for the BMR Calculator?
You need sex used by equation, weight, height and age. Use values that describe the same scenario and measurement period so the comparison remains meaningful.
What does the BMR Calculator show?
The results cover estimated bmr. Change any input to compare another scenario; the answer updates immediately.
Can I rely on this health calculation?
This tool is for general information only and is not a substitute for medical advice, diagnosis or treatment.