BMR Calculator

Basal metabolic rate — the calories you burn at complete rest.

BMR Calculator

Fast online calculation engine

Amount / Value 1

Rate / Percentage / Value 2

Tenure / Value 3

Output Result100010

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What does BMR Calculator do?

Calculate your basal metabolic rate using the Mifflin-St Jeor equation, the formula dietitians consider most accurate for the general population. The Harris-Benedict result is shown alongside for comparison.

How to Use BMR Calculator

1
Enter age and sexBoth change the equation’s constants.
2
Enter height and weightIn metric or imperial — the tool converts internally.
3
Read your BMRThen compare the activity-adjusted daily totals below it.

Key Features

Mifflin-St Jeor equation, the current clinical default
Harris-Benedict result shown for comparison
Metric and imperial units
Daily energy expenditure for five activity levels
Explains what BMR does and does not tell you

Frequently Asked Questions

What is the Mifflin-St Jeor formula?

For men: (10 × kg) + (6.25 × cm) − (5 × age) + 5. For women: the same, minus 161 instead of plus 5. It replaced Harris-Benedict as the recommended equation because it is more accurate for modern populations.

What is the difference between BMR and TDEE?

BMR is what you burn lying still all day. TDEE — total daily energy expenditure — multiplies BMR by an activity factor between 1.2 and 1.9 to account for movement, exercise and digestion. TDEE is the number that matters for diet planning.

How accurate is a BMR estimate?

Typically within about 10% for most people, but it cannot account for body composition, thyroid function or medication. Muscle burns more at rest than fat, so two people of the same height and weight can differ noticeably.

Should I eat only my BMR to lose weight?

No. Eating at or below BMR for a sustained period is generally not recommended and should only be done under medical supervision. Deficits are normally taken from TDEE, not BMR.

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