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
  • 5. Click on the "Calculate" button to observe the results.
BSA Calculator

Results
Estimated Body Surface Area (BSA) =
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

You may also be interested in our Free Online Body Shape Calculator

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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