In physiology and medicine, the body surface area 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 because it is less affected by abnormal adipose mass.

﻿<math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>B</mi><mi>S</mi><mi>A</mi><mo stretchy="false">(</mo><msup><mi>m</mi><mn>2</mn></msup><mo stretchy="false">)</mo><mo>=</mo><mi>w</mi><mi>e</mi><mi>i</mi><mi>g</mi><mi>h</mi><mi>t</mi><mo stretchy="false">(</mo><mi>k</mi><mi>g</mi><msup><mo stretchy="false">)</mo><mn>0.5378</mn></msup><mo>×</mo><mi>h</mi><mi>e</mi><mi>i</mi><mi>g</mi><mi>h</mi><mi>t</mi><mo stretchy="false">(</mo><mi>c</mi><mi>m</mi><msup><mo stretchy="false">)</mo><mn>0.3964</mn></msup><mo>×</mo><mn>0.024265</mn></mrow><annotation encoding="application/x-tex">BSA(m^2) = weight(kg)^{0.5378} × height(cm)^{0.3964} \times 0.024265</annotation></semantics></math>BSA(m2)=weight(kg)0.5378×height(cm)0.3964×0.024265﻿

Body Surface Area in Infants, Children or Adults