Body Surface Area Calculator

This Body Surface Area (BSA) Calculator helps you estimate the body surface area based on body weight and height. The calculator employs the most well-known equations to calculate BSA.

To calculate your body surface area, follow these simple steps:

  • 1. Select your measurement system (imperial or metric)
  • 2. If needed, select your gender
  • 3. Enter your current weight and height
  • 4. Select the equation you would like to use, and
  • 5. Click on the "Calculate" button to observe the results.
BSA Calculator

Results
Estimated Body Surface Area (BSA) =
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Average Body Surface Area Values
Adult Men 1.9 m2
Adult Women 1.6 m2
Child (12-13 years) 1.33 m2
Child (10 years) 1.14 m2
Child (9 years) 1.07 m2
Child (2 years) 0.5 m2
Neonate 0.25 m2

Formulas

The equations to compute BSA are listed below:

The Du Bois equation

BSA [m2] = 0.007184 × weight[kg] 0.425 × height[cm] 0.725

The Mosteller equation

BSA [m2] = 0.016667 × weight[kg] 0.5 × height[cm] 0.5

The Haycock equation

BSA [m2] = 0.024265 × weight[kg] 0.5378 × height[cm] 0.3964

The Gehan & George equation

BSA [m2] = 0.0235 × weight[kg] 0.51456 × height[cm] 0.42246

The Boyd equation

BSA [m2] = 0.03330 × weight[kg] (0.6157 - 0.0188 × log10(weight[kg])) × height[cm] 0.3

The Takahira equation

BSA [m2] = 0.007241 × weight[kg] 0.425 × height[cm] 0.725

The Schlich equation

Women: BSA [m2] = 0.000975482 × weight[kg] 0.46 × height[cm] 1.08
Men: BSA [m2] = 0.000579479 × weight[kg] 0.38 × height[cm] 1.24

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