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Body Surface Area Calculator (BSA)

Calculate body surface area (BSA) in m² using the Mosteller, Du Bois, Haycock and Boyd formulas – used in medicine for drug dosing and cardiac index.

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What is the Body Surface Area Calculator?

Body surface area (BSA) is the total outer area of the body in square metres. Doctors use it to calculate some medicine doses (for example chemotherapy) and to index heart output. Enter height and weight to get BSA from the four most common formulas. The Mosteller formula is the most widely used.

How to use the Body Surface Area Calculator

  1. Enter height (cm) and weight (kg).
  2. Compare the four formulas.
  3. Share the result with your healthcare provider – do not self-dose.

Mosteller formula

BSA (m²) = √(height(cm) × weight(kg) ÷ 3600). An average adult is about 1.7–1.9 m².

This Body Surface Area Calculator is 100% free, needs no signup and runs privately in your browser – on phone, tablet or computer.

Last updated: · By NodifyTech

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