Body Surface Area (BSA) & Total Body Water (TBW) Calculator
BSA & Total Body Water Calculator
Body surface area (BSA)
Equation
---Commonly Used---
Du Bois and Du Bois
Gehan and George
Haycock
Mosteller
---3d scan-derived---
Ashby-Thompson (recommended for adults)
Kuehnapfel
Tikuisis
Yu, Lin, and Yang
---Others---
Boyd
Costeff
Fujimoto and Watanabe
Livingston and Lee
Schlich
Sendroy and Cecchini
Shuter and Aslani
Takahira
BSAm²
Total body water (TBW)
Equation
---Children---
Morgenstern
Mellits-Cheek
Wells
---Adults---
Watson
Hume-Weyers
---Crude estimate---
600 mL/kg (children)
500 mL/kg (nonelderly women)
600 mL/kg (nonelderly men)
450 mL/kg (elderly women)
500 mL/kg (elderly men)
TBW (dry)mL
TBW (total)mL
Calculations must be re-checked and should not be used alone to guide patient care, nor should they substitute for clinical judgment. See our full terms of use.
