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BMR (Harris Benedict) Calculator

Work out bmr (harris benedict) instantly with clear inputs, formula shown and shareable results.

About BMR (Harris Benedict) Calculator

Applies the Roza and Shizgal revision of the Harris-Benedict equations and shows how the result compares with Mifflin-St Jeor.

Formula

Revised Harris-Benedict

Men: BMR = 88.362 + 13.397 x weight + 4.799 x height - 5.677 x age. Women: BMR = 447.593 + 9.247 x weight + 3.098 x height - 4.330 x age

Worked example

With the default values below, BMR (Harris Benedict) Calculator returns Basal metabolic rate of 1,695.7. Change any input above and every figure here is recalculated in your browser.

Inputs used

Weightaccepts 20–300 kg
70 kg
Heightaccepts 100–230 cm
175 cm
Ageaccepts 10–100 years
30 years
Sexone of Male, Female
Male

Results

Basal metabolic rate
1,695.7 kcal/day
Difference from Mifflin-St Jeor
46.9 kcal/day
Daily needs when sedentary
2,034.8 kcal/day
Daily needs when very active
2,925.0 kcal/day

Step by step

  1. 1Values used
  2. 2Revised Harris-Benedict
  3. 3Basal metabolic rate= 1,695.7 kcal/day
  4. 4Difference from Mifflin-St Jeor= 46.9 kcal/day
  5. 5Daily needs when sedentary= 2,034.8 kcal/day
  6. 6Daily needs when very active= 2,925.0 kcal/day

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Why does Harris-Benedict read higher?

It was derived from a leaner early twentieth century population, so it tends to overestimate by 5 to 15% today.

Is the 1919 version different?

Yes. The original equations differ slightly; the 1984 Roza revision is the version used here.

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