Which formulas can I compare?

Choose Mifflin-St Jeor, revised Harris-Benedict or Katch-McArdle. The Katch formula uses your entered body-fat percentage.

The browser remembers your unit, formula and activity settings. Use Copy results or Share to keep the calculated summary elsewhere.

BMR & TDEE Calculator

Estimate daily calorie needs from your measurements.

Formula

Sex Age (years) Height (cm) Weight (kg) Body-fat % (optional) Activity level

BMR (kcal/day)

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TDEE (kcal/day)

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Daily targets

Maintain

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-10% (slow cut)

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-20% (faster cut)

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+10% (gain)

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About these formulas

Mifflin-St Jeor is widely used for adults and tends to perform well on average.

Harris-Benedict (revised) is an older alternative with updated coefficients.

Katch-McArdle uses lean body mass (needs an estimate of body-fat %). Results can differ if the body-fat estimate is off.

These are estimates and don’t account for all personal factors. Use them as a starting point.

Help & FAQ — BMR & TDEE Calculator

Choose Metric or Imperial and enter sex, age, height, weight and activity level.
Choose Mifflin-St Jeor, revised Harris-Benedict or Katch-McArdle; Katch-McArdle needs body-fat percentage.
Review BMR, TDEE and daily calorie targets; copy or share the result.

Which formulas can I compare?: Choose Mifflin-St Jeor, revised Harris-Benedict or Katch-McArdle. The Katch formula uses your entered body-fat percentage.
What is saved?: The browser remembers your unit, formula and activity settings. Use Copy results or Share to keep the calculated summary elsewhere.

Outputs calorie estimates and daily targets for maintenance, deficit or surplus
The age field shows a range of 10–100; this does not establish medical suitability
Unit, formula and activity preferences are stored in this browser

Calculations run in your browser. Copy places the summary on your clipboard; Share sends the displayed results through your chosen app.

15 October 2025