Body Surface Area Calculator

What is Body Surface Area (BSA)?

Body Surface Area (BSA) is the measured or calculated surface area of a human body. In clinical medicine, BSA is considered a more accurate indicator of metabolic mass than body weight alone because it is less affected by abnormal adipose tissue. For why teams dose by square meters, manual Mosteller steps, and reference profiles from infant to adult, see our body surface area Mosteller formula guide.

Standard Clinical Formulas

Multiple equations exist to estimate BSA (using weight $W$ in kg and height $H$ in cm):

• **Mosteller:** $\text{BSA} = \sqrt{\frac{H \times W}{3600}}$
• **DuBois & DuBois:** $\text{BSA} = 0.007184 \times W^{0.425} \times H^{0.725}$
• **Haycock:** $\text{BSA} = 0.024265 \times W^{0.5378} \times H^{0.3964}$
• **Gehan & George:** $\text{BSA} = 0.0235 \times W^{0.51456} \times H^{0.42246}$
• **Boyd:** $\text{BSA} = 0.0003207 \times (W \times 1000)^{0.7285 - 0.0188 \log_{10}(W \times 1000)} \times H^{0.3}$