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Harris–Benedict equation


The Harris–Benedict equation (also called the Harris-Benedict principle) is a method used to estimate an individual's basal metabolic rate (BMR) and daily kilocalorie requirements. The estimated BMR value is multiplied by a number that corresponds to the individual's activity level. The resulting number is the recommended daily kilocalorie intake to maintain current body weight.

The Harris–Benedict equation may be used to assist weight loss — by reducing kilocalorie intake number below the estimated maintenance intake of the equation.

The original Harris–Benedict equations published in 1918 and 1919.

The Harris–Benedict equations revised by Roza and Shizgal in 1984.

The 95% confidence range for men is ±213.0 kcal/day, and ±201.0 kcal/day for women.

The Harris–Benedict equations revised by Mifflin and St Jeor in 1990:

The following table enables calculation of an individual's recommended daily kilocalorie intake to maintain current weight.

The Harris–Benedict equation sprang from a study by James Arthur Harris and Francis Gano Benedict, which was published in 1919 by the Carnegie Institution of Washington in the monograph A Biometric Study Of Basal Metabolism In Man. A 1984 revision improved its accuracy. Mifflin et al. published an equation more predictive for modern lifestyles in 1990. Later work produced BMR estimators that accounted for lean body mass.


BMR calculation for men (metric) BMR = 66.5 + ( 13.75 × weight in kg ) + ( 5.003 × height in cm ) – ( 6.755 × age in years )
BMR calculation for men (imperial) BMR = 66 + ( 6.2 × weight in pounds ) + ( 12.7 × height in inches ) – ( 6.76 × age in years )
BMR calculation for women (metric) BMR = 655.1 + ( 9.563 × weight in kg ) + ( 1.850 × height in cm ) – ( 4.676 × age in years )
BMR calculation for women (imperial) BMR = 655.1 + ( 4.35 × weight in pounds ) + ( 4.7 × height in inches ) - ( 4.7 × age in years )
Men BMR = 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) - (5.677 × age in years)
Women BMR = 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) - (4.330 × age in years)
Men BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5
Women BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161
Little to no exercise Daily kilocalories needed = BMR x 1.2
Light exercise (1–3 days per week) Daily kilocalories needed = BMR x 1.375
Moderate exercise (3–5 days per week) Daily kilocalories needed = BMR x 1.55
Heavy exercise (6–7 days per week) Daily kilocalories needed = BMR x 1.725
Very heavy exercise (twice per day, extra heavy workouts) Daily kilocalories needed = BMR x 1.9

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Wikipedia

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