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BSA Calculator
Estimate body surface area (m²) with the Mosteller formula from height and weight.
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Version 1.0.0 · Last reviewed
How it worksShow guide
Introduction
Estimate adult/pediatric body surface area with the Mosteller formula. BSA is often used when dosing is ordered per m² — always confirm the protocol and capping rules clinically.
Disclaimer: This tool is for informational purposes only and is not professional medical, pharmaceutical, financial, or tax advice. Always verify doses with a licensed clinician or pharmacist.
Formula
Mosteller body surface area uses the square root of height (cm) times weight (kg) over 3600, giving square meters.
- h_cm — Height in centimeters
- w_kg — Weight in kilograms
Step-by-step
- Enter height in centimeters.
- Enter weight in kilograms.
- Read BSA in square meters.
Worked example
A 170 cm, 70 kg patient has BSA ≈ √((170×70)/3600) ≈ 1.82 m².
Use cases
- Estimate BSA before reviewing a per-m² order
- Teach Mosteller BSA pharmacy math
- Cross-check oncology or specialty dosing prep worksheets
Frequently asked questions
Why Mosteller?
It is widely taught, simple, and commonly accepted for quick estimates. Some protocols specify DuBois or other equations — follow the order set.
Is BSA alone enough to dose?
No. Multiply by the ordered mg/m² only when authorized, and apply renal, hepatic, and protocol limits.
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