Body Surface Area (BSA) Calculator
Calculate body surface area (BSA) from height and weight using the Mosteller, DuBois, and Haycock formulas.
√(170 × 65 ÷ 3600) · 임상에서 가장 널리 쓰이는 표준 공식
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- 이 결과는 공식에 따른 참고용 추정치입니다. 실제 항암제 등 약물 용량 산정은 반드시 의사·약사가 결정합니다.
- 공식마다 결과가 조금씩 다릅니다. 임상에서는 Mosteller 공식이 계산 편의성과 정확성으로 가장 널리 쓰입니다.
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Overview
The Body Surface Area (BSA) Calculator estimates the total surface area of the body in square meters from height and weight. BSA is widely used in clinical practice as a more accurate scaling basis than body weight — for chemotherapy and other drug dosing (mg/m²), normalizing kidney function (GFR per 1.73 m²), burn assessment, and cardiac index. This calculator uses the clinically standard Mosteller formula as the primary result, alongside the classic DuBois formula and the Haycock formula often used in pediatrics.
Formula
Mosteller: BSA(m²) = √(height cm × weight kg ÷ 3600) DuBois: BSA(m²) = 0.007184 × height(cm)^0.725 × weight(kg)^0.425 Haycock: BSA(m²) = 0.024265 × height(cm)^0.3964 × weight(kg)^0.5378 e.g., 170 cm, 65 kg → Mosteller √(170×65÷3600) = √3.0694 ≈ 1.75 m²; DuBois ≈ 1.75 m²
How to Use
- 1Enter your height in centimeters.
- 2Enter your weight in kilograms.
- 3Check the Mosteller BSA along with the DuBois and Haycock results.
- 4Use the ratio to the standard adult BSA (1.73 m²) as a reference for relative body size.
Tips
- ✔Different formulas can differ by about 2–3%. The Mosteller formula is the de facto clinical standard thanks to its simplicity and validation.
- ✔Average adult BSA is roughly 1.9 m² for men and 1.6 m² for women; kidney function (eGFR) is normalized to 1.73 m².
- ✔The Haycock formula is known to fit infants and children relatively well.
- ✔Drug dosing in mg/m² must always be determined by medical professionals — never use this result for self-medication.
FAQ
Q. What is body surface area used for?
The best-known use is dosing drugs with a narrow therapeutic window, such as chemotherapy agents (mg/m²). BSA is also used to normalize glomerular filtration rate (GFR) to 1.73 m², to compute cardiac index from cardiac output, and to assess burn extent. It correlates better with metabolic and physiological function than body weight alone.
Q. Should I use the Mosteller or the DuBois formula?
For general purposes, use Mosteller. Published in 1987, it is simple to compute and agrees closely with the 1916 DuBois formula, making it the most widely used in modern clinical practice. DuBois remains common as a historical reference in older literature and is reported to slightly underestimate BSA in underweight individuals.
Q. What is the average adult BSA?
Roughly 1.9 m² for adult men and 1.6 m² for adult women. The standard BSA used to normalize kidney function tests is 1.73 m² — which is why lab reports express eGFR in mL/min/1.73 m².
Q. How is this different from a weight-based (mg/kg) dose calculator?
Weight-based (mg/kg) dosing is common for everyday drugs like antipyretics, while BSA-based (mg/m²) dosing is used for drugs where dosing errors are dangerous, such as chemotherapy, because BSA tracks metabolic rate and organ function more closely. This tool computes the BSA value itself; actual dosing decisions must always be made by medical professionals.
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