What is BSA? Understanding Body Surface Area

Introduction

Body Surface Area (BSA) is a measurement of the total area of the human body. Unlike body weight or body mass index (BMI), BSA provides a more precise metric for medical dosing, particularly in oncology and nephrology.
You can use our BSA calculator to get instant, formula-based results.

Why is BSA Important?

BSA is commonly used to determine correct dosages for medications, especially chemotherapy and other treatments with narrow therapeutic indexes.
It’s also useful for estimating metabolic rate, cardiac output, and renal function.

Common BSA Formulas

• DuBois Formula: One of the earliest and most referenced equations for BSA.
• Mosteller Formula: Simplified and widely adopted in clinical settings.
• Haycock, Gehan-George, Boyd: Alternatives based on different population studies.

You can compare all formulas using our BSA Calculator.

How to Use the BSA Calculator

Simply enter your height and weight to get your BSA using multiple methods.
No login or signup is required. The tool supports metric and imperial units.

👉 Try the BSA Calculator now

Conclusion

BSA is an essential metric in modern medicine. Understanding it helps both professionals and patients make informed decisions.
For quick, accurate BSA results, use our free calculator.