Health and clinical reference
BMR and daily energy calculator
Basal metabolic rate by the Mifflin–St Jeor and revised Harris–Benedict equations, and daily energy needs for a chosen physical activity level.
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For information only. This is a reference calculation, not medical advice or a diagnosis, and it must not be used to choose or adjust medicine doses. Discuss any result or health decision with a qualified clinician.
Result
Method and limits
Both equations predict resting energy expenditure from sex, weight (kg), height (cm) and age (years). Daily energy needs are the BMR multiplied by a physical activity level, as in the FAO/WHO/UNU 2004 report.
Mifflin–St Jeor: 10W + 6.25H − 5A + 5 (men) or − 161 (women)
Harris–Benedict, revised by Roza and Shizgal (1984):
men 88.362 + 13.397W + 4.799H − 5.677A
women 447.593 + 9.247W + 3.098H − 4.330A
Daily energy = BMR × PAL; 1 kcal = 4.184 kJAssumptions and limits
- Population equations: individual metabolism can differ by 10% or more, more so with obesity, illness or very high muscle mass.
- Not for children, pregnancy or breastfeeding, which have different requirements.
Worked example
A 30-year-old man weighing 80 kg at 180 cm: Mifflin–St Jeor gives 800 + 1,125 − 150 + 5 = 1,780 kcal/day and revised Harris–Benedict 1,854 kcal/day; at PAL 1.55 the Mifflin estimate of daily energy is 2,759 kcal.
References
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