The Font dialog box also allows you to change the size of a font. You can use different font sizes to give emphasis to different parts of your document. Font size is commonly expressed in points. Font sizes range from 8 point (extremely small) to 72 point (extremely large).
Arial 10 Point
Arial 12 Point
Arial 20 Point
Arial 26 Point
The standard font size for most documents is 12 point. You can preview different font sizes in the preview window in the Font dialog box.