top of page

Du Bois Formula: The Equation for Calculating Body Surface Area (BSA)

BSA Du Bois Formula

Body Surface Area (BSA) serves as a crucial metric in medicine, aiding in medication dosages, assessment of cardiac output, and the estimation of metabolic needs. It represents the total surface area of a person's body and is commonly used in healthcare settings. Calculating BSA involves a formula that considers height and weight, offering a more accurate understanding of a person's physiological characteristics compared to just using weight or height independently.

The most widely used formula for BSA calculation is the Du Bois formula:


Here's a step-by-step breakdown of how to calculate BSA:

Step 1: Collect the Necessary Data

Gather the individual's height and weight in suitable units (e.g., height in centimeters and weight in kilograms).

Step 2: Apply the Du Bois Formula

Plug the values into the formula:


Step 3: Calculate BSA

Compute the result using a calculator or manually. The resulting value will be in square meters (m²), representing the estimated body surface area.

Importance of BSA Calculation

  1. Medication Dosage: BSA plays a pivotal role in determining appropriate drug dosages. Some medications are prescribed based on BSA to ensure optimal efficacy and reduce the risk of adverse effects.

  2. Clinical Assessments: BSA helps healthcare professionals assess various medical conditions and treatments. It aids in determining the severity of burns, planning radiation therapy, and evaluating cardiac function.

  3. Pediatric Care: In pediatric medicine, BSA is especially valuable for dosing medications, as children's physiological responses can significantly differ from adults.

Limitations and Considerations

While the Du Bois formula is widely used, it's important to note its limitations. It might not be suitable for all populations, such as individuals with extreme obesity or those with significant muscle mass variations.


Understanding Body Surface Area (BSA) and its calculation method provides healthcare professionals with a valuable tool for medical assessments and treatments. However, it's crucial to use BSA alongside other clinical assessments and individual patient considerations for a comprehensive approach to healthcare. Its application aids in precise medication dosing, clinical evaluations, and personalized patient care.


Discover NutriSwift—a seamless nutrition platform! Access a vast food database with in-depth micronutrient profiles, making personalized diet plans effortlessly. Begin hassle-free with our Free Forever plan. Bid farewell to meal planning hurdles—embrace NutriSwift for a simplified journey!


Join the Club

Join our email list and get access to special and exclusive contents and offers to our subscribers.

Thanks for submitting!

bottom of page