Body surface area affects medication dosing, device sizing, and clinical calculations. You can estimate yours in seconds using just height and weight — no charts or complex math required.
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Why BSA matters
BSA refines drug doses and helps size medical equipment; a small number can change treatment choices. See how that single value comes from simple inputs next.
The simple math behind it
A trusted method converts height and weight into BSA with a single square-root formula (Mosteller). It balances ease and clinical reliability — ready for the three-step flow?
A free, easy 3-step process
Enter your height, input your weight, and tap calculate. The tool returns a BSA value in m² within seconds — learn the accuracy checks coming up.
Units, limits, and accuracy
Confirm units and use current measurements. The estimate suits most adults but can mislead with extreme sizes or special cases — find when to double-check next.
Read the full guide
Step-by-step instructions, the exact formula, accuracy notes, examples, and FAQs to use the BSA calculator confidently.