Body Surface Area Calculator (BSA)

What is the BSA calculator – body surface area?

The BSA calculator (Body Surface Area) calculates the body surface area, which is used in medication dosing calculations, hydration protocols, and burn injury classification. The most common formulas are Du Bois (1916) or Mosteller (1987).

The calculator is free and works in the browser without registration. This site offers over 200 calculators.

Calculation principle

Du Bois: BSA = 0.007184 × weight^0.425 × height^0.725. Mosteller: BSA = √(height × weight / 3600).

Enter the information into the calculator fields – the result updates immediately. You can try different values to compare scenarios.

Practical example

75 kg, 175 cm → Du Bois: BSA ≈ 1.91 m². Mosteller: BSA ≈ 1.91 m².

This example illustrates a typical situation. Enter your own information to get a personal result.

Who is the calculator suitable for?

The calculator serves individuals, entrepreneurs, students, and professionals. All calculators on this site are free and no registration is required.

The results are indicative – official decisions are always made based on calculations by authorities or professionals.

Tips and notes

• BSA is a medical tool – use the information only in conjunction with healthcare professionals.
• The Mosteller formula is easier to calculate manually: BSA = √(height×weight/3600).
• Normal BSA for adults is 17.2–21.5 sq ft.