DocomintBody Surface Area Calculator
Calculate Body Surface Area (BSA) from height and weight using the Mosteller formula.
BSA is used clinically to dose certain medications (particularly chemotherapy) more precisely than a flat per-kilogram dose would — the Mosteller formula, a square root of height times weight over 3600, is the version most widely used in practice for its balance of simplicity and accuracy against more complex alternatives.
Example: A person at 175cm and 70kg has a BSA of about 1.65 m² — a clinician would use this figure, not raw body weight alone, as an input to a per-m² medication dosing formula.
How it works
- Enter your height and weight
- Press Calculate
- Your body surface area, in square meters, appears instantly, computed on your device using the Mosteller formula
Frequently asked questions
What is Body Surface Area used for medically?
Clinicians use BSA to dose certain medications — most notably chemotherapy drugs — more precisely than a simple per-kilogram weight-based dose would, since BSA correlates better with metabolic processes relevant to drug distribution for some treatments.
How accurate is the Mosteller formula?
It's the most widely used BSA formula in clinical practice today, valued for its simplicity — a few other formulas (DuBois, Haycock) exist and produce slightly different results, but Mosteller's accuracy is considered comparable while being far easier to compute.
Is my numbers uploaded anywhere?
No — Body Surface Area Calculator runs entirely in your browser using JavaScript/WebAssembly. Your numbers is never sent to a server.