Business letters should be professionally written letters that give useful information and can be reviewed quickly. Examples of business letters can be cover letters, letters of resignation, inter-office letters and letters sent via email correspondence. A business letter should be written in a font that is easily readable by the recipient. Make sure to choose a font that remains clear if you have to decrease the size to fit the letter on a single page.

Times New Roman

Times New Roman is the most common business letter font, according to Purdue Online Writing Lab. A serif font, Times New Roman can easily be read at many different sizes and appears professional for printed material. Times New Roman also remains the default font for many word processing programs. When using Times New Roman in a business letter, set the size as 12-point in order for the document to be read most easily.

Arial

Arial can be used in professional letters, and is a good font for letters transmitted via email because it is a sans serif font. A Sans Serif font doesn't contain decorative flourishes at the end of the strokes.. Arial can be read at small sizes and also is most commonly used at 12-point for professional letters.

Georgia

Another popular serif font for business letter writing is Georgia. Since Georgia tends to be a little larger than Times New Roman, a user might decrease the size to 11-point.