Letter page size is the standard paper dimension in the United States, measuring 8.5 inches wide by 11 inches tall. It's the default format for most American documents, printers, and copiers.
The 8.5 x 11-inch format became standard in the U.S. during the early 20th century. It balances readability and paper usage efficiency. Unlike ISO paper sizes (like A4), which scale proportionally, letter size is part of a fixed set of North American sizes including legal (8.5 x 14 inches) and ledger (11 x 17 inches).
While letter is the most common, other standard U.S. sizes include:
| Name | Dimensions (inches) | Common Uses |
|---|---|---|
| Letter | 8.5 × 11 | Documents, letters, forms |
| Legal | 8.5 × 14 | Legal documents |
| Ledger/Tabloid | 11 × 17 | Spreadsheets, posters, newspapers |
Letter size dominates U.S. offices, schools, and homes due to its compatibility with standard printers and copiers. The U.S. government adopted it as the default for federal documents. Most American printers have letter as their default setting, though many also support legal and ledger sizes.
A common misconception is that letter size is the same as A4, the international standard. While they're close (A4 is 8.3 x 11.7 inches), the slight difference causes formatting issues when exchanging documents between countries. For example, a letter-sized document printed on A4 paper will have narrower margins.
People often confuse letter size with A4, the international standard. While similar, A4 measures 8.3 x 11.7 inches, making it slightly taller and narrower. This difference matters for precise layouts, especially in design work. Another confusion arises with "letter" as a term - it doesn't refer to the alphabet letter "L," but rather comes from its historical use for written correspondence.
When I set up a home office printer, I discovered that while most U.S. printers default to letter size, they can handle other sizes through manual feed trays. For a project requiring both letter and legal-sized documents, I had to adjust the settings for each print job. The printer automatically scaled content to fit, but precise placement required manual adjustments for the legal-sized pages.