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BMR & Calorie Calculator

Estimate your basal metabolic rate and daily calorie needs using Mifflin-St Jeor.

To estimate your calorie needs, enter your age, sex, weight, height and activity level. Basal metabolic rate is calculated with the Mifflin-St Jeor equation, then multiplied by an activity factor to give total daily energy expenditure and targets for gradual weight change.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

How accurate is this?

Mifflin-St Jeor is the most accurate common equation, but individual metabolic rate varies by roughly 10% either way. Use the number as a starting point and adjust based on what actually happens over three to four weeks.

How to use the bmr & calorie calculator

  1. 1Choose the units.
  2. 2Choose the sex at birth.
  3. 3Set the age.
  4. 4Set the weight.
  5. 5Set the height.
  6. 6Choose the activity level.
  7. 7The result appears immediately — copy or download it.

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Put the working bmr & calorie calculator on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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