The Harris-Benedict equation is a formula used to estimate Basal Metabolic Rate (BMR), which represents the number of calories the body needs at rest to maintain basic physiological functions such as breathing and circulation.

REE , resting energy expenditure, in kcal/day.

Men: REE = 66.5 + (13.75 × W) + (5 × H) - (6.76 × A)

Women: REE = 655 + (9.56 × W) + (1.85 × H) - (4.68 × A)

W = Weight (kg)

H = Height (cm)

A = Age (years)