BSA Calculator - Body Surface Area

Your details

Body weight in kilograms (metric) or pounds (imperial).
kg
Height in centimetres (metric) or inches (imperial).
cm
Different research groups derived BSA formulas from different populations. Du Bois and Mosteller are the most commonly used in clinical practice.
Body Surface AreaNormal adult BSA
1.85m²

Total external skin surface area

Du Bois1.85m²
Mosteller1.84m²
Haycock1.85m²
Gehan & George1.85m²
Fujimoto1.8m²
Relative to adult average7% above the 1.73 m² reference adult
1.85 m²
Infant<0.5Child0.5-1.14Small adult1.14-1.5Normal adult1.5-2.1Large adult2.1+

Your BSA is 1.85 m² using the Du Bois formula.

  • All five formulas agree closely for this height and weight combination, which is typical for average-build adults.
  • Your BSA is above the reference adult value of 1.73 m². Some institutions historically capped BSA-based doses at 2.0 m², but ASCO guidance recommends dosing cytotoxic chemotherapy on actual body weight without capping, because capping underdoses larger patients.
  • BSA is used in clinical settings to normalise cardiac output (cardiac index), creatinine clearance, and certain drug doses. It is not a health risk indicator by itself.

Next stepAlways confirm medication doses with a qualified clinician. BSA calculators are reference tools; final dosing decisions depend on renal function, body composition, and protocol-specific rules.

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