This vCalc Fill Factor equation (Lay Factor - Layer Wound) reports the fill factor measure of the cross-sectional compactness of a winding build of a transformer. The fill factor is associated with a chosen range of AWG gauges.
The selectable inputs are:
gauge range -- a selectable set of AWG wire gauge range
The equation outputs the unitless fill factor.
This equation, Lay Factor - Layer Wound, references 1 page