Font.GetHeight Method (Single)
Returns the height, in pixels, of this Font when drawn to a device with the specified vertical resolution.
Assembly: System.Drawing (in System.Drawing.dll)
If the Unit property of the font is set to anything other than GraphicsUnit.Pixel, the height (in pixels) is calculated using the vertical resolution of the screen display. For example, suppose the font unit is inches and the font size is 0.3. Also suppose that for the corresponding font family, the em-height is 2048 and the line spacing is 2355. If the specified vertical resolution is 96 dots per inch, the height is calculated as follows:
2355*(0.3/2048)*96 = 33.1171875