Free tool

BMR Calculator

Calculate basal metabolic rate and total daily energy expenditure for your clients using three validated formulas: Harris-Benedict, Mifflin-St Jeor and Katch-McArdle.

Mifflin-St Jeor

Considered the most accurate for overweight or obese individuals. Recommended by the American Dietetic Association.

Moderate exercise 3–5 days per week

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What is BMR?

Basal Metabolic Rate (BMR) is the minimum number of calories your body needs to keep vital functions running at complete rest — breathing, circulating blood, maintaining body temperature, and cell repair. Think of it as your body's idle fuel consumption.

BMR makes up roughly 60–75% of your total daily calorie burn, making it the most important variable in any nutrition plan. Once you know BMR, multiplying by an activity factor gives you TDEE — the actual number of calories you burn each day.

BMR vs TDEE: what to use when

Fat loss

TDEE – 500

~0.5 kg loss per week. Sustainable and preserves muscle.

Maintenance

TDEE

Eat at TDEE to hold current weight and support recomposition.

Muscle gain

TDEE + 300

Lean surplus. Enough to support growth without excessive fat gain.

Frequently asked questions