Converting between WPF font size and "standard" font size
WPF uses pixels as its default unit for font size. The mapping between points (probably what you mean when you say "standard" font size) and pixels is: 1 pt = (96/72) px
This gives us a simple conversion function:
public static double PointsToPixels(double points){ return points*(96.0/72.0);}See this question for more details.