Nomograms for calculation of fat free mass for male and female adults (18 to 80 years of age). Fat free mass is a close approximation to lean body weight. The nomogram was created by Michelle Park, Hesham Al-Sallami, Stephen Duffull The FFM formula Reference: Janmahasatian, S., Duffull, S.B., Asha, S., Ward, L.C., Byrne, N.M., Green, B. Quantification of lean body weight. Clinical Pharmacokinetics. (2005) 44(10):1051-1065