Body surface area calculator

This body surface area (BSA) calculator computes BSA using various formulas based on a user’s weight, height, and sex. It supports weight inputs in kilograms, grams, or pounds and height inputs in centimeters or feet-inches, dynamically updating results as inputs are provided.

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Body surface area

Body surface area (BSA) is a measurement of the total surface area of the human body, often expressed in square meters (m²). It is commonly used in medicine to determine appropriate drug dosages, fluid requirements, and physiological functions, as it provides a more accurate scale of body size compared to weight alone. BSA is typically calculated using mathematical formulas based on a person’s weight and height.

Various BSA formulas

In all these formulas, weight is measured in kilograms (kg) and height in centimeters (cm).

Du Bois formula:

BSA=0.007184×(Weight^{0.425})×(Height^{0.725})

Mosteller formula:

BSA=0.016667×Weight^{0.5}×Height^{0.5}

Haycock formula:

BSA=0.024265×(Weight^{0.5378})×(Height^{0.3964}) 

Gehan and George formula:

BSA=0.0235×(Weight^{0.51456})×(Height^{0.42246}) 

Boyd formula:

BSA=0.03330×(Weight^{(0.6157−0.0188×log⁡_{10}(Weight))})×(Height^{0.3}) 

Fujimoto formula:

BSA=0.008883×(Weight^{0.444})×(Height^{0.663}) 

Takahira formula:

BSA=0.007241×(Weight^{0.425})×(Height^{0.725}) 

Schlich Formula (Gender-specific):

For men:

BSA=0.000579479×(Weight^{0.38})×(Height^{1.24})

For women:

BSA=0.000975482×(Weight^{0.46})×(Height^{1.08})