Letter Paper Size, Dimensions and Format (US series)

Letter in millimeters

216 x 279




Aspect ratio 1:1.29
Area (A) 60,264 mm²
Perimeter (P) 990 mm
Diagonal (d) 352.84 mm


The Letter format measures 216 x 279 mm or 8.5 x 11 inches. An Letter paper fromat has an aspect ratio of 1:1.29. The Area of the Letter paper size is 60,264 mm² or 93.50 in² with a perimeter of 990 mm or 39 in. An Letter format has a diagonal length of 352.84 mm or 13.90 in. The Letter size belongs to the US series. In the US series there are a total of 8 paper sizes.

Frequently Asked Questions:

The size of an Letter paper is 216 x 279 mm

The size of an Letter paper in inches is 8.5 x 11 in

The half size of an Letter paper is 108 x 139.5 mm or 4.25 x 5.5 in

The aspect ratio of an Letter is 1:1.29

The area of an Letter paper is 60,264 mm or 93.50 in

The perimeter of an Letter paper is 990 mm or 39 in

The diagonal measurement of Letter paper is 352.84 mm or 13.90 in

Other US Paper Sizes

There are a total of 8 US Paper Sizes.