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. Author manuscript; available in PMC: 2016 Jun 1.
Published in final edited form as: Clin Ther. 2015 May 29;37(6):1340–1351. doi: 10.1016/j.clinthera.2015.05.006

Table I.

Equations for measures of weight.

Weight Type Equation
Actual weight
Allometric weight (ALWT)12,13 ALWT (kg) = Weight (kg)0.75
Body surface area (BSA)14 BSA (m2) = (Height [cm] × Weight [kg]/3600)0.5
Lean body mass (LBM)15,16
 ≤5 years LBM (kg) = 0.0817 ×eight (kg)0.6469 × Height (cm)0.7236
 >5 years, male ln(LBM [kg]) = −2.8990 + 0.8064 ln (Height [cm]) + 0.5674 ln(Weight [kg]) + 0.0000185 Weight (kg)2 − 0.0153 BMIz2 + 0.0132 Age (y)
 >5 years, female ln(LBM [kg]) = −3.8345 + 0.954 ln (Height [cm]) + 0.6515 ln(Weight [kg]) − 0.0102 BMIz2
Ideal weight (IW)14,17–19
 1–18 years, <5 ft IW (kg) = Height (cm)2 × 1.65/1000
 1–18 years, ≥5 ft, male IW (kg) = 2.27 kg/in × Height (in) above 5 ft + 39 kg
 1–18 years, ≥5 ft, female IW (kg) = 2.27 kg/in × Height (in) above 5 ft + 42.2 kg
 >18 years, male IW (kg) = 2.3 kg/in × Height (in) above 5 ft + 50 kg
 >18 years, female IW (kg) = 2.3 kg/in × Height (in) above 5 ft + 45.5 kg
Adjusted weight(AW) (kg)20
 Weight > IW AW (kg) = IW (kg) + 0.4 × (Weight [kg] − IW)
 Weight ≤ IW AW (kg) = Weight (kg)
Body Mass Index (BMI) (kg/m2) BMI (kg/m2) = Weight (kg)/Height (m)2