Body Surface Area Calculator

Body surface area is a measure clinicians use to size things to your body, from medication doses to assessments of kidney and heart function.

Weight (kg)Height (cm)

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Part of Seri Rise, one of Seri's health companions.

How it's calculated

We show two long-established formulas, Du Bois and Mosteller, both based on your height and weight. They agree closely for most people.

How to read your result

This is a clinical figure rather than a fitness one. If you have been asked for your BSA, bring the value your care team prefers, as some treatments are dosed against a specific formula.

Common questions

What is body surface area used for?

Mainly medical dosing, especially chemotherapy, and indexing measures like cardiac output or kidney function to body size.

Which formula should I use?

Is a higher BSA better or worse?

Method: Du Bois and Mosteller formulas.