Body Surface Area Calculator

Calculate total surface area of a human body using various formulas

Table of average BSAs

Category ft² m²
Newborn child 2.69 0.25
Two-year-old child 5.38 0.5
Ten-year-old child 12.27 1.14
Adult female 17.22 1.6
Adult male 20.45 1.9

About Body Surface Area (BSA)

BSA is often used in clinical purposes over body weight because it is a more accurate indicator of metabolic mass (the body's need for energy). Metabolic mass can be estimated using fat-free mass, where fat-free mass is all of a person's body mass that does not include fat.

Clinical Applications

  • Determining cardiac index
  • Calculating chemotherapy dosages
  • Estimating metabolic mass

Popular BSA Formulas

Du Bois formula:
BSA = 0.007184 × W0.425 × H0.725

Mosteller formula:
BSA = 0.016667 × W0.5 × H0.5

Haycock formula:
BSA = 0.024265 × W0.5378 × H0.3964