BSA Calculator
Calculate Body Surface Area in m² with the Du Bois and Mosteller formulas from weight and height
Enter Your Details
Your Result
Du Bois
1.85
m²
Mosteller
1.84
m²
Average of both formulas
1.85 m²
BSA guides chemotherapy and drug dosing, burn-area estimates and cardiac index. Dosing decisions must be made by a clinician — never dose medication from this calculator alone.
About this Tool
Body Surface Area (BSA) estimates your skin's total area in square metres from weight and height. This calculator shows both the classic Du Bois formula and the simpler Mosteller formula, which usually agree within a few percent and are widely used in clinical practice.
Common Use Cases
Drug Dosing
Many chemotherapy, paediatric and critical-care doses are scaled to BSA rather than weight alone.
Burn Assessment
BSA helps express burn size and fluid needs as a share of total body area.
Cardiac Index
Cardiac output divided by BSA gives cardiac index, a standard heart-function measure.
Fitness Tracking
Compare BSA over time alongside BMI for a fuller picture of body size.
Pro Tips
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Formulas Agree Closely
Du Bois suits research precision; Mosteller is easier mental math — either is fine for everyday estimates.
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Measure Accurately
Weigh lightly clothed and measure height barefoot — small errors shift BSA noticeably.
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Consult Your Doctor
BSA-based dosing is a clinical decision. Always consult a doctor or pharmacist before using BSA for any medication.
FAQs
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