Health · Free online calculator
Body Surface Area Calculator
Calculate an approximate body surface area with a commonly used formula.
CALCULATOR GUIDE
How the Body Surface Area Calculator works
Calculate an approximate body surface area with a commonly used formula. This guide explains the inputs, calculation method, example and key limitations so you can check whether the result fits your question.
Calculate an approximate body surface area with a commonly used formula.
Mosteller body surface area = square root of (height in cm × weight in kg ÷ 3600).
Inputs to prepare
Before you calculate, gather the values the question asks for and check their units. Choose options carefully and use consistent dates, periods and starting values. The notes below describe the fields shown in the calculator above.
- Weight (kg)Use a numeric value and keep the displayed unit consistent. Allowed range: 1 to 1000
- Height (cm)Use a numeric value and keep the displayed unit consistent. Allowed range: 50 to 300
How to use the Body Surface Area Calculator
- Enter the details. Fill in each required field and use the units or formats shown next to it.
- Check your assumptions. Confirm dates, comparison values, time periods and selected options before submitting.
- Calculate and review. Read the result together with its unit, time period and any additional breakdown.
- Compare scenarios. Change one input at a time if you want to understand how different values affect the outcome.
Formula and worked example
Mosteller body surface area = square root of (height in cm × weight in kg ÷ 3600).
Example calculation
Enter height and weight in the requested units.
Try the same values in the calculator above. If your result differs, recheck the units, input order, assumptions and rounding displayed by the tool.
What your result means
Calculate an approximate body surface area with a commonly used formula. Read the result label and unit carefully. A useful estimate describes only the inputs and assumptions supplied; it should not be treated as proof of a future outcome or a guarantee.
- Check the displayed unit and period before comparing results.
- Use values from a reliable source and keep them up to date.
- Repeat the calculation with an independent check when the outcome matters.
Assumptions and limitations
This estimate is for general reference and should not be used alone to make medical decisions.
The calculator is a general-purpose tool. Actual outcomes may depend on local rules, provider terms, measurement standards or personal circumstances not represented in the fields. For consequential financial, health, legal, tax or construction decisions, confirm the result with an appropriate authoritative or qualified source.
Frequently asked questions
How does the body surface area calculator work?
Mosteller body surface area = square root of (height in cm × weight in kg ÷ 3600).
Can I rely on the result as an exact answer?
This estimate is for general reference and should not be used alone to make medical decisions.
How can I get a more useful estimate?
Use accurate inputs, keep units consistent, check the assumptions on this page and compare the output with an authoritative source when the result affects a financial, health, construction or legal decision.
For transparency, use the formula and worked example to check the output. Add authoritative references and have the calculation reviewed before relying on it for a consequential decision.