Mosteller BSA Calculator
The √(H×W/3600) one-liner — the BSA formula clinicians actually compute at the bedside.
Published as a one-paragraph letter to the NEJM in 1987, Mosteller's simplification is accurate within a couple of percent of the complex formulas across adult and most paediatric sizes — which is why oncology dose calculators default to it.
Formula
Reference aid for healthcare professionals only. Every result must be independently verified before clinical use. Never use this tool for self-medication or to replace clinical judgement.
The √(H×W/3600) one-liner — the BSA formula clinicians actually compute at the bedside. The Mosteller BSA Calculator is a free, private mosteller formula tool — every result computes instantly in your browser with no sign-up and no data upload.
About Mosteller BSA Calculator
Published as a one-paragraph letter to the NEJM in 1987, Mosteller's simplification is accurate within a couple of percent of the complex formulas across adult and most paediatric sizes — which is why oncology dose calculators default to it. It applies BSA = √(height(cm) × weight(kg) ÷ 3600). Use the Mosteller BSA Calculator to get an instant, clearly-explained result with the working shown step by step — free, private and with the source method cited.
How to use Mosteller BSA Calculator
- 1Enter your details in the Mosteller BSA Calculator input fields above.
- 2The result updates instantly with the working and reference bands shown.
- 3Adjust any value to explore how it changes the outcome — it's free and unlimited.
Why use Mosteller BSA Calculator?
- ✓Instant mosteller formula result that recomputes as you type — no waiting, no page reloads
- ✓100% client-side: your health data never leaves your browser
- ✓Shows the actual formula and your numbers substituted in, so you can see exactly how the result is reached
- ✓Based on published, citable sources (Mosteller RD, N Engl J Med 1987;317:1098)
- ✓Free forever with no sign-up, account or app install
Frequently asked questions
How does the Mosteller BSA Calculator work?+
Published as a one-paragraph letter to the NEJM in 1987, Mosteller's simplification is accurate within a couple of percent of the complex formulas across adult and most paediatric sizes — which is why oncology dose calculators default to it. The calculation uses the formula: BSA = √(height(cm) × weight(kg) ÷ 3600). Everything runs instantly in your browser as you type — your inputs are never uploaded.
Is the Mosteller BSA Calculator accurate, and what is it based on?+
The method is traceable to authoritative sources, including Mosteller RD, N Engl J Med 1987;317:1098; Verbraecken J et al., Metabolism 2006 — BSA formula comparison. Results are estimates — individual variation always applies, so treat the output as a well-grounded starting point.
Is the Mosteller BSA Calculator free and private?+
Yes. It's completely free with no sign-up, and all computation happens locally in your browser, so none of your health data ever leaves your device.
Can I use this for medical decisions?+
This is a reference aid for healthcare professionals and must be independently verified. It is not for self-diagnosis or self-medication.
What can I use the Mosteller BSA Calculator for?+
It's commonly used for mosteller formula, bsa mosteller, sqrt hw 3600. The √(H×W/3600) one-liner — the BSA formula clinicians actually compute at the bedside.
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