The most common size of computer paper is 8.5 x 11 inches, also known as "letter size". This is the standard size for most printers and is used for a wide range of standard documents, including letters, academic documents, and business documents. The North American standard has established formats and aspect ratios, and the most popular formats of the traditional sizes are the Letter (8.5 × 11 inches), Legal (8.5 × 14 inches), and Tabloid (11 × 17 inches) formats. The international paper size standard is ISO 216, which includes the commonly used A4 size.