# Body Surface Area Calculator

> Calculate body surface area with Mosteller, Du Bois, Haycock, Gehan–George, Boyd, and Schlich formulas.

Page: https://askcalculators.com/calculator/body-surface-area-calculator/
Definition: https://askcalculators.com/calculator/body-surface-area-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/body-surface-area-calculator/schema.json
Version: 2.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/body-surface-area-calculator/?unitSystem=metric&sex=male&weightKg=70&heightCm=175

## Inputs
- unitSystem: Units; type=select; required; default=metric; values=metric|imperial
- sex: Sex used by equation; type=select; required; default=male; values=male|female
- weightKg: Weight; type=number; required; default=70; min=1; max=500; showWhen=unitSystem:metric
- heightCm: Height; type=number; required; default=175; min=50; max=300; showWhen=unitSystem:metric
- weightLb: Weight; type=number; required; default=154; min=2; max=1100; showWhen=unitSystem:imperial
- feet: Height feet; type=number; required; default=5; min=1; max=9; showWhen=unitSystem:imperial
- inches: Height inches; type=number; required; default=9; min=0; max=11.9; showWhen=unitSystem:imperial

## Outputs
- mosteller: Mosteller BSA; format=number; primary
- duBois: Du Bois BSA; format=number
- haycock: Haycock BSA; format=number
- gehanGeorge: Gehan–George BSA; format=number
- boyd: Boyd BSA; format=number
- schlich: Schlich BSA; format=number
- average: Formula average; format=number

## Formula
Mosteller: √(height cm × weight kg ÷ 3600); other published equations use formula-specific powers of height and weight.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.

Notice: BSA is an estimate. Clinical dosing or treatment decisions require professional verification.