Area (M²) is the total frontal area presented by the rider and bike. A typical cyclist presents a frontal area of 0.3 to 0.6 meters squared depending on position. Frontal areas of an average cyclist riding in different positions are as follows.

Tops* 0.632
Hoods* 0.40
Drops* 0.32

Aerodynamic drag: CdA is calculated by multiplying Frontal Area: A by the Coefficient of drag: Cd.