Body Surface Area Calculator
Calculate total body surface area (BSA) for clinical dosing and assessment.
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Formula
Calculates the total surface area of the human body in square meters.
Worked Example
Body Surface Area (BSA)
- Mosteller Formula: BSA (m²) = √[(Height(cm) × Weight(kg)) / 3600]
- DuBois & DuBois Formula: BSA (m²) = 0.007184 × Height(cm)^0.725 × Weight(kg)^0.425
- Average BSA for an adult male is ~1.9 m² and for an adult female is ~1.6 m²
- BSA correlates better with metabolic rate and blood volume than body weight alone
While Mosteller is the most commonly used due to its simplicity, clinical protocols may specify a particular equation.
You can also calculate changes using our BMI Calculator, Ideal Weight Calculator or Creatinine Clearance Calculator.
Frequently Asked Questions
Why use BSA instead of weight?
BSA is a better indicator of metabolic mass and drug clearance. It is the standard for dosing medications with narrow therapeutic windows, such as chemotherapy.
What is a normal BSA?
Average values are roughly 1.9 m² for men and 1.6 m² for women, but values vary significantly based on height and body composition.
What is the most accurate BSA formula?
The Mosteller formula is highly accurate and used widely in clinical practice. The DuBois formula is also a common standard in many laboratory references.
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