The formula of Pace and Rathbun can be used to estimate the total body water from the lean body mass.


total body water in kilograms =

= (lean body mass in kilograms) * (percentage of lean body mass as total body water) =

= (lean body mass in kilograms) * (0.73)



• 73% is a higher percentage than other estimates of total body water based on body weight (see following sections). In many adolescents and adults the amount of adipose tissue increases with age.

• According to Skelton (1927) adipose tissue is 10% water. Gregory et al (see below) say that fat is anhydrous.


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