+(CGFloat)pixelToPoints:(CGFloat)px {
    CGFloat pointsPerInch = 72.0; // see: http://en.wikipedia.org/wiki/Point%5Fsize#Current%5FDTP%5Fpoint%5Fsystem
    CGFloat scale = 1; // We dont't use [[UIScreen mainScreen] scale] as we don't want the native pixel, we want pixels for UIFont - it does the retina scaling for us
    float pixelPerInch; // aka dpi
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
        pixelPerInch = 132 * scale;
    } else if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
        pixelPerInch = 163 * scale;
    } else {
        pixelPerInch = 160 * scale;
    }
    CGFloat result = px * pointsPerInch / pixelPerInch;
    return result;
}