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Body Surface Area Calculator

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Body surface area (Mosteller formula) 0 m²

Body surface area is used clinically to dose certain medications (especially chemotherapy) and to estimate metabolic and fluid needs — the Mosteller formula is the version most commonly cited in clinical references for its simplicity and accuracy.

Free body surface area calculator using the Mosteller formula — the version most commonly cited in clinical references for its simplicity and accuracy.

This tool is for informational purposes only and is not a substitute for professional financial or medical advice. Consult a qualified professional before making decisions. See our Disclaimer.

How it works

  1. Enter your height and weight
  2. See your estimated body surface area in square meters

Frequently asked questions

What is body surface area used for?

It's used clinically to calculate medication dosages (especially chemotherapy), and to estimate metabolic rate and fluid requirements — BSA correlates better with these than weight alone across a wide range of body sizes.

Why the Mosteller formula specifically?

It's the formula most commonly cited in clinical references for being simple to calculate while remaining accurate — a straightforward square root of (height × weight / 3600), versus more complex alternatives like the Du Bois formula.

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From the blog

Body surface area, not weight, is what determines chemotherapy dosing — here's the formula hospitals actually use
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Body surface area, not weight, is what determines chemotherapy dosing — here's the formula hospitals actually use

The Mosteller formula is the clinical standard for a reason: simple enough for a quick bedside calculation, accurate enough to trust.

2026-09-01

Update history

  • 2026-09-03 Bounded numeric fields are now sliders instead of number inputs.
  • 2026-09-01 Added: a cover image — used as the card thumbnail, social share image, and blog title image.
  • 2026-09-01 Launched: body surface area calculator using the Mosteller formula. Entirely client-side, reuses the body composition engine.