Health Tools

Body Surface Area Calculator

Estimate body surface area from height and weight using a standard practical method.

Updated April 16, 2026
Free online tool
Planning and research use

Why this page exists

Body-size estimates can be easier to compare when height and weight are translated into one body surface area number instead of being reviewed separately. This calculator helps visitors estimate body surface area using the common Mosteller method and supports both imperial and metric inputs.

Interactive tool

Run the estimate

Enter your numbers and read the result first, then use the sections below to understand what affects the outcome.

Calculator

Body surface area calculator

Estimate body surface area from height and weight using the Mosteller method.

Result

1.95 m²

Estimated body surface area using the Mosteller method based on the height and weight entered.

Estimated body surface area1.95 m²

Height used5 ft 10 in

Weight used170.0 lb

Equivalent square feet21.01 sq ft

Using the Mosteller method, 5 ft 10 in and 170.0 lb gives a body surface area near 1.95 m².
This kind of estimate is usually used as a body-size reference point rather than as a complete health assessment.
Use the result as a general estimate only, because different formulas and measurement methods can produce slightly different BSA values.

This is a general body-size estimate, not medical advice. Body surface area does not diagnose a condition or replace individualized dosing or care decisions.

Planning note

Last updated April 16, 2026. Use this tool to compare scenarios and plan ahead, then confirm important details with the lender, employer, insurer, contractor, or other qualified provider involved in the final decision.

How it works

What the calculator is doing

Choose imperial or metric inputs, then enter height and weight.

The calculator converts the values into metric units when needed.

It applies the Mosteller formula to estimate body surface area and shows the values used.

Understanding your result

This is a general body-size estimate, not a medical diagnosis or prescription. Different formulas and measurement methods can produce slightly different results.

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Examples

Ways people use this tool

Example scenarios help turn a quick estimate into a more useful comparison or planning step.

Translate height and weight into one reference number

A BSA estimate can be easier to compare than separate height and weight numbers when you want a simple body-size reference.

Check the result in either unit system

The calculator supports imperial and metric inputs so it is easier to work from the numbers you already have.

Use it with other body-size tools

Body surface area often makes more sense beside BMI, calorie-needs, and ideal-weight tools.

FAQ

Common questions

How is body surface area estimated here?

The calculator uses the Mosteller formula, which estimates BSA from height in centimeters and weight in kilograms.

Can I use feet and pounds instead of centimeters and kilograms?

Yes. The calculator supports both imperial and metric input modes and converts the values as needed.

Why is this only a general estimate?

Because BSA is formula-based and can vary slightly depending on the method used and the quality of the measurements entered.

Related tools

Keep comparing

Use these related tools to compare nearby scenarios, check a second estimate, or keep narrowing down the right decision.

Health ToolsUpdated April 11, 2026