Overview :

Garrow and Webster developed equations for fat free mass in adults based on the Quetelet Index of body mass to the square of body height. The authors are from the Nutrition Research Group at the Clinical Research Centre in Harrow, England.

Parameters:

(1) body height in meters

(2) body weight in kilograms

fat free mass in kilograms =

= (body weight in kilograms) - (fat mass in kilograms)

fat mass in kilograms =

= ((A * (weight) / ((height)^2)) - B) * ((height)^2)

where:

• A = 0.715 for males and 0.713 for females

• B = 12.1 for males and 9.74 for females

If the equations are rearranged:

fat free mass for males in kilograms =

= (0.285 * (weight in kilograms)) + (12.1 * ((height in meters)^2))

fat free mass for females in kilograms =

= (0.287 * (weight in kilograms)) + (9.74 * ((height in meters)^2))

Garrow JS, Webster J. Quetelet's Index (W/H^2) as a measure of fatness. Int J Obestiy. 1985; 9: 147-153 (page 150).

Salazar DE, Corcoran GB. Predicting creatinine clearance and renal drug clearance in obese patients from estimated fat-free body mass. Am J Med. 1988; 84: 1053-1060.