BMR Calculator

To calculate BMR, enter sex, age, height and weight: Mifflin-St Jeor gives 10 × kg + 6.25 × cm − 5 × age + 5 for men (−161 for women). ClickZM also shows the revised Harris-Benedict and, with body fat %, the Katch-McArdle result.

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BMR (Mifflin-St Jeor)

1,649 kcal/day

BMR (Harris-Benedict, revised): 1,696 kcal/day

Activity level	Calories to maintain
Sedentary: little or no exercise	1,979 kcal
Light: exercise 1–3 days a week	2,267 kcal
Moderate: exercise 3–5 days a week	2,556 kcal
Active: hard exercise 6–7 days a week	2,844 kcal
Very active: physical job or twice-daily training	3,133 kcal

Mifflin-St Jeor: 10 × kg + 6.25 × cm − 5 × age + 5 (men) or − 161 (women). It is the equation the Academy of Nutrition and Dietetics rates as most accurate for most adults.

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How to use BMR Calculator

1Enter your values in the fields; defaults show a worked example.
2Pick the units or options that apply to you.
3Read the result, which updates instantly as you type.
4Check the formula note under the result to see exactly how it was worked out.

BMR Calculator: questions people ask

What is BMR?

The calories your body burns at complete rest to stay alive: breathing, circulation and cell repair. It is usually 60–70% of daily energy use.

Which BMR formula is most accurate?

Mifflin-St Jeor for most adults; Katch-McArdle is better if you know your body fat percentage.

Is my data uploaded when I use the BMR Calculator?

No. The BMR Calculator runs entirely in your web browser, so your text and numbers stay on your device and work even on a slow connection.

Does the BMR Calculator work on iPhone, Android and Mac?

Yes. The BMR Calculator runs in any modern browser (Safari, Chrome, Edge or Firefox) on iPhone, iPad, Android phones, Mac, Windows and Chromebook. There is no app to install.

Is the BMR Calculator free?

Yes. The BMR Calculator is free with no signup, no watermark and no daily limit.