Typically, the height of a small capital will be one ex, the same height as most lowercase characters in the font; classically, small caps were very slightly taller than x-height.Fact: date=July 2007 Well-designed small capitals are not simply scaled-down versions of normal capitals; they normally retain the same stroke weight as other letters, and a wider aspect ratio to facilitate readability.

Many word processors and text formatting systems include an option to format text in caps and small caps; this leaves uppercase letters as they are but converts lowercase letters to small caps. How this is implemented depends on the typesetting system; some can use true small caps associated with a font, making text such as "Latvia joined sc: ATO on March 29, 2004" look proportional, but most modern digital fonts do not have a small-caps case, so the typesetting system simply reduces the uppercase letters by a fraction, making them look out of proportion. (Often,Fact: date=July 2007 in text, the next bolder version of the small caps generated by such systems will match well with the normal weights of capitals and lower case, especially when such small caps are extended about 5% or letterspaced a half point or a point.)

Uses of small caps

Small caps are often used for text that is all uppercase; this makes the run of capital letters seem less jarring to the reader. For example, the style of many American publications, including the Atlantic Monthly and USA Today, is to use small caps for acronyms and initialisms longer than three lettersFact: date=August 2007; thus: "U.S." and "FDR" in normal caps, but " " in small caps. The initialisms " " and " " are often smallcapped as well.

Small caps are commonly used for showing keyboard shortcuts; for example, "The keyboard shortcut in Microsoft Word for small caps is ."

Perhaps the most common use of small capitals is in the rendering of the word " " in many versions of the Bible. Typically, an ordinary "Lord" corresponds to the use of the word Adonai in the original Hebrew, but the small caps " " corresponds to the use of Yahweh in the original; in some versions the compound "Lord " represents the Hebrew compound Adonai Yahweh.

French and some British publicationsFact: date=February 2007 use small caps to indicate the surname by which someone with a long formal name is to be designated in the rest of a written work. An elementary example is Don de La Mancha. Similarly, they are used for those languages in which the surname comes first, such as the romanization Zedong.

Some publishers' house styles, such as those of Newsweek and DC Comics, use small caps to refer to the name of their own publications inside the same or another publication.

The 2003 Manual on Uniform Traffic Control Devices, which specifies standards for road signs used in the United States, requires that cardinal directions (such as ) be displayed in small caps. This is thought to enhance readability.