Body Surface Area Calculator

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Body Surface Area or BSA is the total surface area of the human body. Our Body Surface Area Calculator is a tool to determine the BSA in your body.

The body surface area is used in many measurements in medicine including the calculation of drug dosages and the volume of fluids to be administered intravenously. In other words, the BSA is the measured or calculated surface area of a human body.

For many clinical purposes, BSA is a better indicator of metabolic mass than body weight. This is less affected by abnormal adipose mass.


Height
 
 
Weight
 

 
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How is Body Surface Area (BSA) calculated?


Body Surface Area can be calculated by using the below-mentioned formulas:

Boyd's Formula:
BSA in square meters = 0.0003207 * (height in cm 0.3) * (weight in g (Y))

Where,
Y = (0.7285 - (0.0188 * log (weight))

Here, the first component is arrived at by powering the height in centimeters with 0.3 and the second component is derived by powering the weight in kilograms by Y (kindly refer above to the know the value of Y). Hence, using Boyd's Formula, first and second components are multiplied with 0.0003207 to give you the Body Surface Area in square meters.
Dubois Formula:
BSA in square meters = 0.20247 * (height in m 0.725) * (weight in kg 0.425)

To use the Dubois Formula, two components are used. The height in meters is exponentiated to 0.725 forming the first component. The second component is exponentiating the weight in kg to 0.425. The two components are first multiplied and then the result is multiplied by 0.20247 to give the Body Surface Area in square meters.
Gehan George Formula:
BSA in square meters = 0.0235 * (height in cm 0.42246) * (weight in kg 0.51456)

To use the Gehan George Formula, again two components are needed. The first component is arrived by exponentiating 0.42246 to the height in centimeters and the second component is achieved by exponenting 0.51456 to the weight in kilograms. The two components are first multiplied and then the result is multiplied by 0.0235 to give the Body Surface Area in square meters.
Haycock Formula:
BSA in square meters = 0.024265 * (height in cm 0.3964) * (weight in kg 0.5378)

The Haycock Formula utilizes two components. The first component is arrived by exponentiating 0.3964 to the height in centimeters and the second component is achieved by exponentiating 0.5378 to the weight in kilograms. The two components are first multiplied and then the result is multiplied by 0.024265 to give the Body Surface Area in square meters.
Mostellers Formula:
BSA in square meters = SQRT([Height in cm * Weight in kg] / 3600)

In the Mostellers Formula, first the height in centimeters is multiplied with the weight in kilograms and the answer is divided by 3600. Then, the square root is taken of the final answer, which gives us the Body Surface Area in square meters.
 


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