BMR Calculator

Calculate your Basal Metabolic Rate with Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle formulas.

BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest—for breathing, circulation, and basic cell functions. Use this calculator to compare results from Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle formulas.

Enter weight, height, age, and gender.
Optional: enter body fat % to enable Katch-McArdle (more accurate if you know it).
View your BMR and the formula comparison table.

Mifflin-St Jeor (default), Harris-Benedict, Katch-McArdle
Optional body fat % for Katch-McArdle
Metric and imperial units

What is BMR?: Basal Metabolic Rate is the minimum calories your body needs at rest for basic life functions.
Which formula is best?: Mifflin-St Jeor is recommended for most people. Katch-McArdle can be more accurate if you know your body fat percentage.

TDEE Calculator BMR Calculator

Weight

Height

Weight

lbs

Height

Age

yrs

Gender

Male Female

Activity Level

SedentaryLittle or no exercise×1.2 Lightly ActiveExercise 1-3 days/week×1.375 Moderately ActiveExercise 3-5 days/week×1.55 Very ActiveHard exercise 6-7 days/week×1.725 Extra ActiveVery hard exercise + physical job×1.9

Body Fat % (optional)

Enables Katch-McArdle formula for more accurate results

Your Daily Calories

calories/day

BMR: -- cal/day

Lose Weight

-500 cal/day

Maintain

No change

Gain Weight

+500 cal/day

Macro Breakdown

Protein-- g (30%)

Carbs-- g (45%)

Fat-- g (25%)

Your BMR

calories/day

Mifflin-St Jeor Formula

Formula Comparison

Formula	BMR (cal)
Mifflin-St Jeor	--
Harris-Benedict	--
Katch-McArdle *	--

* Requires body fat % for accurate result

BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest. This is the minimum energy needed for basic functions like breathing, circulation, and cell production.

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