Body Surface Area (BSA) Calculator

Introduction

This Body Surface Area (BSA) Calculator is a medical tool used to determine the total surface area of the human body. Unlike BMI, which measures mass relative to height, BSA measures the external area. It is crucial for calculating accurate dosages for chemotherapy, determining cardiac output, and assessing fluid requirements for burn victims.

How to Use

1. Select Unit: Choose Metric (kg/cm) or Imperial (lbs/ft/in).
2. Enter Data: Input your weight and height accurately.
3. Calculate: Click the button to get instant results.
4. Compare: Review the Du Bois and Mosteller formula results for precision.

Key Formulas Used

• Du Bois Formula: The historical gold standard since 1916. BSA = 0.007184 × W0.425 × H0.725
• Mosteller Formula: Simplified and widely used in modern medicine. BSA = √((H × W) / 3600)

Why is BSA Important?

In medicine, body weight alone is often misleading for drug dosages because fat tissue has lower metabolic activity than muscle. BSA correlates better with cardiac output, blood volume, and kidney function, making it a safer metric for critical medications.

Common Questions