I\'ve noticed in WPF, the default font size of 12 points is roughly equivalent to 9 points in \"normal\" applications (e.g. WordPad), 10 pt in WPF is roughly 7 pt standard, and
Another method for conversion if you're going from point to WPF double is to use the System.Windows.FontSizeConverter class:
double sizeForWpf = (double) new FontSizeConverter().ConvertFrom("10pt");