BSA Calculator Boyd formula

What is Body Surface Area (BSA)?

Body Surface Area (BSA) is a measurement used in many medical tasks, including determining the correct dosages for medications and assessing metabolic mass. It provides a more accurate measure of the body's surface area than simple height and weight measurements.

Formula

The Boyd formula for calculating BSA is given by:

$\text{BSA} = 0.03330 \times W^{(0.6157 - 0.0188 \times \log_{10}(W))} \times H^{0.3}$

where:

$W$ is the weight in kilograms
$H$ is the height in centimeters

BSA Formula Step by Step Example Calculation

Let's assume the following values:

Weight: 70 kg
Height: 175 cm

Using the formula:

$\text{BSA} = 0.03330 \times 70^{(0.6157 - 0.0188 \times \log_{10}(70))} \times 175^{0.3}$

Calculating step-by-step:

$0.6157 - 0.0188 \times \log_{10}(70) \approx 0.6157 - 0.0188 \times 1.845 \approx 0.581$

$70^{0.580} \approx 11.75$

$175^{0.3} \approx 4.71$

$\text{BSA} = 0.03330 \times 11.75 \times 4.71 \approx 1.843\, \text{m}^2$

The calculated Body Surface Area (BSA) is approximately 1.843 m².