EE.UU. Los tamaños de papel en españolFormats papier américains en franĉais

US Paper Sizes

North America, including the US, Canada and parts of Mexico, is the only area of the first world that doesn't use the ISO 216 standard paper sizes, instead they use Letter, Legal, Executive and Ledger/Tabloid paper sizes and those that have been formalised in ANSI Y14.1M - Metric Drawing Sheet Size & Format. US Envelope Sizes are also non ISO 216 and are listed on this page

The following table gives the sizes in millimeters and inches of the Commonly used American paper sizes.

Size Width x Height (mm) Width x Height (in) Aspect Ratio
Letter 216 x 279 mm 8.5 x 11.0 in 1:1.2941
Legal 216 x 356 mm 8.5 x 14.0 in 1:1.6471
Junior Legal 127 x 203 mm 5.0 x 8.0 in 1:1.6000
Ledger / Tabloid 279 x 432 mm 11.0 x 17.0 in 1:1.5455

The following page discusses North American paper weights in detail, as it is useful to know how weight as well as size and stock type affects your choice of paper. The difference between US Letter and Legal Paper sizes and international A4 is discussed here, however it is important to say that Letter is effectively the equivalent to A4 size in the USA.

ANSI Standard Paper Sizes

ANSI (American National Standards Institute) defined a regular series of paper sizes based around the Letter (8.5" x 11") format, with this becoming the A sizes and larger sizes being B,C,D & E. Surprisingly these ANSI standard sizes were defined in 1995 well after the ISO standard sizes.

Unlike the ISO standard sizes which have the single aspect ratio of 1:root2, ANSI standard sizes have two aspect ratios 1:1.2941 and 1:1.5455 which means that enlarging and reducing between the sizes is not as easy as with the ISO sizes and leaves wider margins on the enlarged/reduced document.

Size Width x Height (mm) Width x Height (in) Aspect Ratio Nearest ISO
A 216 x 279 mm 8.5 x 11.0 in 1:1.2941 A4
B 279 x 432 mm 11.0 x 17.0 in 1:1.5455 A3
C 432 x 559 mm 17.0 x 22.0 in 1:1.2941 A2
D 559 x 864 mm 22.0 x 34.0 in 1:1.5455 A1
E 864 x 1118 mm 34.0 x 44.0 in 1:1.2941 A0

B+ (Super B)

B Plus, or Super B as it is sometimes known, has dimensions of 13" x 19" (329mm x 483mm). This size is the ANSI B size with a 1" margin for print bleed all the way round. It is sometimes known as A3+ or Super A3 in countries that use ISO 216 paper sizes.

Architectural Paper Sizes

North America also has a special series of paper sizes defined for architectural purposes, in general these have aspect ratios of 4:3 or 3:2. These aspect ratios are very similar to the aspect ratio used for computer screens.

The following table gives details of the sizes for architectural paper.

SizeWidth x Height (mm)Width x Height (in)Aspect Ratio
Arch A229 x 305 mm9.0 x 12.0 in4:3
Arch B305 x 457 mm12.0 x 18.0 in3:2
Arch C457 x 610 mm18.0 x 24.0 in4:3
Arch D610 x 914 mm24.0 x 36.0 in3:2
Arch E914 x 1219 mm36.0 x 48.0 in4:3
Arch E1762 x 1067 mm30.0 x 42.0 in7:5


US Paper Sizes - Quick Lookup

Select the paper size from the 'Size' selector and the unit from the 'Unit' selector - the dimensions will be shown in the dimensions box.

Size Unit Dimensions
in is



© 2016 - Cookies & Privacy - Help Us Improve - Contact Us