Body Surface Area Calculator

Calculate your body surface area (BSA) using multiple medical formulas.

Result

Fill in the fields above, then press Calculate.

A Body Surface Area (BSA) calculator estimates the total surface area of the human body, which is critical in medicine for calculating drug dosages, especially chemotherapy, and assessing metabolic rates.

Enter your weight and height. The calculator estimates your body surface area (BSA) using five established formulas: Du Bois, Mosteller, Haycock, Boyd, and Gehan-George. BSA is commonly used in medicine for drug dosing.

Examples

170 lbs, 5'9"

Weight: 77 kg, Height: 175 cm. Du Bois BSA = 0.007184 x 77^0.425 x 175^0.725 = 1.93 m².

Frequently Asked Questions

Why is body surface area important?
BSA is used in clinical medicine to calculate drug dosages (especially chemotherapy), determine cardiac output, and assess metabolic rate. It provides a better measure of metabolic mass than body weight alone.
What is a normal BSA for adults?
Average BSA for adult males is about 1.9 m² and for adult females about 1.6 m². The typical range for adults is 1.5-2.2 m².
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Quick Tips

  • •The Du Bois formula is the most widely used in clinical practice and is a safe default choice.
  • •For pediatric patients, the Haycock formula tends to be more accurate than Du Bois.
  • •Always confirm drug dosing calculations with a healthcare professional.