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BMR (Mifflin St Jeor) Calculator

Work out bmr (mifflin st jeor) instantly with clear inputs, formula shown and shareable results.

About BMR (Mifflin St Jeor) Calculator

Applies the Mifflin-St Jeor equation, the predictive formula that performs best against measured resting energy expenditure in most adults.

Formula

Mifflin-St Jeor

BMR = 10 x weight (kg) + 6.25 x height (cm) - 5 x age + 5 for men or - 161 for women

Worked example

With the default values below, BMR (Mifflin St Jeor) Calculator returns Basal metabolic rate of 1,648.8. 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
1,648.8 kcal/day
BMR per kilogram
23.554 kcal/kg/day
Daily needs when sedentary
1,978.5 kcal/day
Daily needs when moderately active
2,555.6 kcal/day

Step by step

  1. 1Values used
  2. 2Mifflin-St Jeor
  3. 3Basal metabolic rate= 1,648.8 kcal/day
  4. 4BMR per kilogram= 23.554 kcal/kg/day
  5. 5Daily needs when sedentary= 1,978.5 kcal/day
  6. 6Daily needs when moderately active= 2,555.6 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 3 decimal places, 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 is Mifflin preferred over Harris-Benedict?

It was derived from a more modern population and predicts measured resting energy expenditure with less bias.

How accurate is any prediction equation?

Within about 10% for most people, but individual variation of 200 to 300 kcal a day is common.

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BMR (Mifflin St Jeor) Calculator | Calcrivo