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BMR calculator

Work out your basal metabolic rate (BMR), the calories your body burns at complete rest in a day. Pick Mifflin-St Jeor, Harris-Benedict or Katch-McArdle and enter your age, sex, weight and height. Free, and it runs in your browser.

How to calculate your BMR

  1. 1Enter your sex, age, weight and height
  2. 2Choose a formula (Katch-McArdle also needs body fat %)
  3. 3Read your BMR in kcal a day
  4. Your BMR in kcal a day, plus kJ and per hour.

What you get

  • Your BMR in kcal and kJ.The calories burned a day at complete rest, and the same per hour.
  • Three formulas to compare.Switch formula and see the other two results listed next to it.
  • Nothing leaves your device.The sum runs in your browser. No account, no upload.

What you can do

  • Choose Mifflin-St Jeor (the recommended one), Harris-Benedict (revised 1984) or Katch-McArdle.
  • Enter body fat % for Katch-McArdle, which works from lean body mass.
  • See the result in kilocalories a day, in kilojoules and per hour.
  • Compare with the other Mifflin-St Jeor or Harris-Benedict value in the same view.
  • Work in kilograms and centimeters, or in pounds, feet and inches.

Good to know

  • BMR is what you burn at rest. Daily activity comes on top, which the TDEE calculator adds.
  • The tool needs an age of 18 or more.
  • It is an estimate, not medical advice. Real metabolism differs from person to person.

Questions

What is BMR?

Basal metabolic rate is the energy your body needs for breathing, circulation and keeping warm while you rest. It is given in kilocalories a day.

Which BMR formula is best?

Mifflin-St Jeor is the usual choice and the tool's default. Katch-McArdle can fit better if you know your body fat percentage.

Is BMR the same as the calories I should eat?

No. It is only your resting burn. Multiply by an activity factor to get your daily need, which the TDEE calculator does.

Is the BMR calculator free?

Yes, with no sign-up. Your numbers are worked out in your browser and are not uploaded.

Related tools

How it works

Small tools that run in your browser.

Four steps

  1. Start with a file or a task

    Drop a file, search, or pick a task.

  2. The tool opens in a window

    Open as many as you like, side by side as tabs.

  3. Results collect on the right

    Drag a result into the next tool.

  4. Save when you're done

    Saved files go to your downloads.

Who uses what

Tool sets for common jobs.

Put a tool on your home screen

The icon opens that tool, like an app.

iPhone and iPad

  1. Open the tool in Safari.
  2. Tap Share (the square with the arrow).
  3. Choose “Add to Home Screen”, then Add.

Android

  1. Open the tool in Chrome.
  2. Tap the menu (⋮) at the top right.
  3. Choose “Add to Home screen” or “Install app”.

Computer

  1. Open the tool in Chrome or Edge.
  2. Click the install icon in the address bar.
  3. Choose Install.

Skills

Claude skills we use ourselves, one job each.