body surface area (Fujimoto)
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The Fujimoto Body Surface Area calculator approximates 
the body surface area of the human body based on the person's weight (w) and height (h) using the Fujimoto BSA formula.
INSTRUCTIONS: Choose weight and height units and enter the following:
- (w) Weight of Person
- (h) Height of Person
Body Surface Area (BSA): The BSA is computed in square meters (m²). However, this can be automatically converted into other area units via the pull-down menu.
The Math / Science
The Fujimoto formula is as follows:
BSA = 0.008883 ⋅ h0.663 ⋅ w0.444
where:
- BSA = Body Surface Area
- h = height of person
- w = weight of person
BSA is used in physiology and medicine. The default input units are centimeters (cm) for height and kilograms (kg) for weight, and meters squared (m2). However, the calculator provides automatic conversions for both the inputs and outputs to other (e.g. English) units via the pull-down menus.
Body Surface Area (BSA) is the measured or calculated surface area of a human body frequently used in physiology and medicine. For many clinical purposes BSA is a better indicator of metabolic mass than body weight because it is less affected by abnormal adipose mass. Estimation of BSA is simpler than many measures of volume.
| BSA Calculators vs Inputs | |||
| Method | Height | Weight | Gender |
| Mosteller | x | x | |
| Gehan and George | x | x | |
| Boyd | x | x | |
| DuBois | x | x | |
| Haycock | x | x | |
| Fujimoto | x | x | |
| Takahira | x | x | |
| Schlick | x | x | x |
| Costeff | x | ||
| Wang Hihara | x | x | |
Demographic BSA Means
| Age Range | Male | Female |
|---|---|---|
| Neonate | 0.243 m² | 0.234 m² |
| 2 years old | 0.563 m² | 0.54 m² |
| 5 years old | 0.787 m² | 0.771 m² |
| 10 years old | 1.236 m² | 1.245 m² |
| 13 years old | 1.603 m² | 1.55 m² |
| 18 years old | 1.98 m² | 1.726 m² |
| 20 to 79 years old | 2.06 m² | 1.83 m² |
| 80 and above | 1.92 m² | 1.638 m² |
Body Surface Area (BSA) Calculators
- Mosteller formula Body Surface Area Calculator
- Gehan and George formula Body Surface Area Calculator
- Boyd formula Body Surface Area Calculator
- DuBois formula Body Surface Area Calculator
- Haycock formula Body Surface Area Calculator
- Fujimoto formula Body Surface Area Calculator
- Takahira formula Body Surface Area Calculator
- Costeff formula Body Surface Area Calculator
- Wang Hihara Body Surface Area Calculator
- Schlick Body Surface Area Calculator
- Body Surface Area Comparison with Averages
Other BSA Applications
- The BSA Compare function lets you enter a body surface area and choose a demographic (above) to compute the percent compared to the mean.
- Wallace Rule of Nines: This computes a percentage of the human body for burn victims based on percentages allocated to different body parts.
- Rule of Fives: This computes a percentage of the human body for obese burn victims.
- Parkland Replacement Fluid: This compute the volume of replacement fluids needed in the first 24 hours based on the patients weight (mass) and the percent of their body that has been burned.
- BSA Percent: This computes a body surface area based on the total body surface area and a percent..
Calculators
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