Total Body Surface Area (TBSA) Calculator

Total Body Surface Area (TBSA)

Estimate body surface area using Du Bois or Mosteller methods

Du Bois Method

Mosteller Method

Weight (kg) Height (cm)

Formula (Du Bois & Du Bois, 1916):
BSA (m²) = 0.007184 × Weight^0.425 × Height^0.725

Note: This formula is widely used for adult patients and provides slightly lower estimates than the Mosteller method. Considered the original “gold standard” derived from empirical data on nine individuals.

Du Bois D, Du Bois EF. A formula to estimate the approximate surface area if height and weight be known. Arch Intern Med. 1916;17(6):863–871.

Weight (kg) Height (cm)

Formula (Mosteller, 1987):
BSA (m²) = √((Height × Weight) ÷ 3600)

Note: The Mosteller method simplifies earlier equations while maintaining high accuracy. It is commonly used in pediatric and oncology dosing.

Mosteller RD. Simplified calculation of body-surface area. N Engl J Med. 1987 Oct 22; 317(17):1098.

⚠️ Disclaimer: This tool is provided for educational and clinical reference only. It does not replace clinical judgment, diagnostic evaluation, or professional advice. Always verify results and consider individual patient conditions before applying calculations in practice.