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Body Surface Area Calculator

Unidades:

Weight (kg)

Height (cm)

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O que é Body Surface Area Calculator?

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Body Surface Area (BSA) is used in medicine to calculate drug doses, burn area, and cardiac output. The Mosteller formula is the most widely used due to its simplicity.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

Fórmula

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f(x)Mosteller: BSA (m²) = √(Height(cm) × Weight(kg) / 3,600); DuBois: BSA = 0.007184 × H^0.725 × W^0.425

Legenda de variáveis

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Símbolo	Nome	Unidade	Descrição
BSA	Body Surface Area	m²	—
H	Height	cm	—
W	Weight	kg	—

Como Body Surface Area Calculator

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1Mosteller: BSA (m²) = √(Height(cm) × Weight(kg) / 3,600)
2DuBois: BSA = 0.007184 × H^0.725 × W^0.425
3Boyd: accounts better for extremes of weight
4Normal adult BSA: approximately 1.7–1.9 m²

Exemplos resolvidos

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Exemplo 1

Dado:175cm, 70kg (Mosteller)

Resultado:BSA = √(175×70/3600) = √3.403 = 1.845 m²

Aplicações práticas

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Oncology chemotherapy dosing

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Paediatric medication calculations

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Burn injury assessment

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Cardiac output estimation

BSA by Age (Mosteller)

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Age	Average BSA (m²)
Newborn	0.25
1 year	0.47
5 years	0.73
10 years	1.14
Adult male	1.90
Adult female	1.60

Perguntas frequentes

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Why is BSA used instead of weight for drug dosing?

BSA correlates better with physiological processes (metabolic rate, organ function) than weight alone.

What's the normal adult BSA range?

Typically 1.7–1.9 m². Average adult ≈ 1.8 m². Children much smaller proportionally.

Which formula should I use?

Mosteller is simpler and preferred in most modern clinical settings. DuBois and Boyd for specific populations.

Referências

›BSA formulas — Mosteller 1987 NEJM

Formula-verified for precision

Reviewed October 2026

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Body Surface Area Calculator