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Body Surface Area Calculator

Calculate total body surface area (BSA) for clinical dosing and assessment.

Enter Values

Height (cm)

Weight (kg)

Result

Enter values above and click Calculate to see your result.

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Formula

Core Formula

\text{BSA} = \sqrt{\frac{\text{Height} \times \text{Weight}}{3600}}

How it works: Calculates the total surface area of the human body in square meters.

Worked Example

180 cm, 80 kg -> ~2.00 m²

Body Surface Area (BSA)

Body Surface Area is the total surface area of a human body. In medicine, it is often more accurate than weight for calculating dosages of drugs with high toxicity (like chemotherapy) and for cardiac index assessments.

Mosteller Formula: BSA (m²) = √[(Height(cm) × Weight(kg)) / 3600]
DuBois and DuBois Formula: BSA (m²) = 0.007184 × Height(cm)^0.725 × Weight(kg)^0.425
Average BSA for an adult male is ~1.9 m² and for an adult female is ~1.6 m²
BSA correlates better with metabolic rate and blood volume than body weight alone

While Mosteller is the most commonly used due to its simplicity, clinical protocols may specify a particular equation.

You can also calculate changes using our BMI Calculator, Ideal Weight Calculator or Creatinine Clearance (CrCl) Calculator.

Frequently Asked Questions

Why use BSA instead of weight?

BSA is a better indicator of metabolic mass and drug clearance. It is the standard for dosing medications with narrow therapeutic windows, such as chemotherapy.

What is a normal BSA?

Average values are roughly 1.9 m² for men and 1.6 m² for women, but values vary significantly based on height and body composition.

What is the most accurate BSA formula?

The Mosteller formula is highly accurate and used widely in clinical practice. The DuBois formula is also a common standard in many laboratory references.

Can I embed this Body Surface Area Calculator on my website?

Yes. Click the "Embed" button at the top of this page to customize the size, colors, and theme, then copy the iframe code. Paste it into any HTML page, WordPress site, or CMS. It is completely free, requires no signup, and works on all devices. You can also visit our embed guide at calculory.com/services/embed-calculators for more details.

Medical Disclaimer

This calculator is provided for informational and educational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any decisions based on these results. Do not disregard or delay seeking medical advice because of information obtained from this tool.

AI Assistant

Ask about this calculator

I can help you understand the body surface area calculator formula, interpret your results, and answer follow-up questions.

Try asking

Our AI assistant provides general estimates and advice only. Please consult a qualified healthcare professional before making any health-related decisions.

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BMI Calculator Ideal Weight Calculator Creatinine Clearance (CrCl) Calculator

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