What is the BMR Calculator?
Estimate your basal metabolic rate (BMR): the calories your body uses at complete rest.
Enter weight, height, age and sex and the BMR Calculator returns BMR, calories per hour at rest and harris-Benedict estimate. Results update as you type, and nothing you enter leaves your device.
How it is calculated
Mifflin-St Jeor: BMR = 10 × weight + 6.25 × height − 5 × age + 5 (men) or − 161 (women)
This is a general estimate for adults and not medical advice. Talk to a doctor or dietitian about your own health.
How to use it
- Enter weight in kg.
- Enter height in cm.
- Enter age in years.
- Choose sex.
- Read BMR in the results panel. It updates as you type.
- Change any value to compare scenarios, or use Share to send the result as a link.
Worked example
Common questions
What formula does the BMR Calculator use?
It uses: Mifflin-St Jeor: BMR = 10 × weight + 6.25 × height − 5 × age + 5 (men) or − 161 (women).
What do I need to use the BMR Calculator?
You need weight, height, age and sex. Sensible starting values are filled in so you can see how it works straight away.
Is the BMR Calculator free, and is my data stored?
It is free with no sign-up. The calculation runs in your browser, so the values you enter are not sent to or stored on our server.