Basal Metabolic Rate (Harris-Benedict)
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Patient Gender Male Female
Age in years
Weight
unit kg lb
Height
unit in cm
R e s u l t s
BMR - kcal/day
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Basal Metabolic Rate (Harris-Benedict)

The Basal Metabolic Rate (BMR) is the amount of energy that would be expended at rest in a temperate environment with no activity.

Factors considered in this calculation include:

  • Gender
  • Height
  • Weight
  • Age

BMR in units of Kcal/day:

  • Males = 66.5 + (13.75 × Wt) + (5.003 × Ht) - (6.755 × age)
  • Females = 655.1 + (9.563 × Wt) + (1.850 × Ht) - (4.676 × age)

Wt = Kilograms of actual body weight

Ht = Height in cm

Age = Age in years

Expenditures due to activity affect the actual caloric requirements to maintain one's weight, usually by a multiple of the BMR of:

Energy Needs Activity Level
BMR × 1.2 Sedentary (little or no exercise)
BMR × 1.375 Lightly active (Some physical activity 1-3 days/week)
BMR × 1.5 Moderately active (Exercise 3-5 days/week)
BMR × 1.725 Very active (Exercise 6-7 days/week)
BMR × 2.0 Heavy physical training, double training, etc

Reference:

Harris JA, Benedict FG. A Biometric Study of Human Basal Metabolism. Proc Natl Acad Sci USA. 1918;4(12):370-3.