What is normal adult Body Surface Area (BSA)?

The average body surface area for adult men is approximately 1.9 m², and for adult women is approximately 1.6 m². Average adult BSA across all populations is generally cited as 1.7 to 1.73 m².

Why is BSA used instead of BMI or body weight for chemotherapy dosing?

BSA correlates more closely with physiological parameters such as cardiac output, renal glomerular filtration rate (GFR), and basal metabolic rate than weight alone, making it standard for narrow-therapeutic-index oncology medications.

Which BSA formula is considered the most standard in clinical practice?

The Mosteller formula is the most widely adopted in clinical practice and hospital electronic health records due to its mathematical simplicity, high accuracy across all age groups, and validation against 3D surface laser scans.

Does this calculator support pediatric measurements?

Yes. The Haycock and Mosteller formulas computed by this tool are clinically validated for pediatric infants and children as well as adults.

Health & Calculators

Body Surface Area (BSA) Calculator

Calculate total Body Surface Area in m² using Mosteller, DuBois, and Haycock clinical formulas.

Medical Disclaimer: This tool is for informational purposes only and is not a substitute for professional medical advice. BSA values are used clinically for medication dosing — always consult a qualified healthcare provider.

Unit System

Weight

Height

Average BSA

1.847 m²

Mosteller

1.845

m²

DuBois

1.848

m²

Haycock

1.847

m²

ℹ️ BSA is used clinically for drug dosing (chemotherapy), burn injury assessment, and kidney function calculations. Average adult BSA: 1.7–1.9 m².

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What is Body Surface Area (BSA) Calculator?

The Body Surface Area (BSA) Calculator computes total external human body surface area in square meters (m²) based on height and weight. Supporting both Metric (cm/kg) and Imperial (ft/in/lbs) units, it simultaneously calculates results across 5 recognized clinical formulas: Mosteller, DuBois & DuBois, Haycock, Gehan & George, and Boyd.

Designed for accuracy, speed, and privacy, this tool runs entirely on your local device with zero network latency.

How to Use the Body Surface Area (BSA) Calculator

1
Select your measurement unit system (Metric: cm/kg or Imperial: ft/in/lbs).
2
Enter your body weight and total standing height.
3
Inspect your primary Body Surface Area in square meters (m²) based on the standard Mosteller formula.
4
Compare calculated surface area values across the DuBois, Haycock, Gehan-George, and Boyd clinical models.

Formula & Calculation Logic

Calculates body surface area using the Mosteller formula (standard in modern clinical oncology for drug dosing) and the historical DuBois & DuBois formula (1916), Haycock pediatric formula (1978), Gehan & George (1970), and Boyd (1935).

Mosteller BSA (m²) = sqrt((Height_cm * Weight_kg) / 3600) | DuBois BSA = 0.007184 * Weight^0.425 * Height^0.725

Body Surface Area (BSA) Calculator Frequently Asked Questions

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