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The ISO satandard is known to follow a logical pattern. The US paper size standard does not. There are many conflicting sizes and standards for US paper. This standard has been designed to be used in conjunction with the US Envelope series of paper.

Some of the paper series, such as Ansi and ARCH, do follow an aspect ratio. The ARCH format is most commonly used by architects in North America.

FormatWidth × Height (mm)Width × Height (cm)Width × Height (in)
Letter216 x 279 mm21.6 × 27.9 cm8.5 x 11 in
Legal216 x 356 mm21.6 × 35.6 cm8.5 x 14 in
Tabloid279 x 432 mm27.9 × 43.2 cm11 x 17 in
Ledger432 x 279 mm43.2 × 27.9 cm17 x 11 in
Junior Legal127 x 203 mm12.7 × 20.3 cm5 x 8 in
Half Letter140 x 216 mm14 × 21.6 cm5.5 x 8.5 in
Govt Letter203 x 267 mm20.3 × 26.7 cm8 x 10.5 in
Govt Legal216 x 330 mm21.6 × 33 cm8.5 x 13 in
ANSI A216 x 279 mm21.6 × 27.9 cm8.5 x 11 in
ANSI B279 x 432 mm27.9 × 43.2 cm11 x 17 in
ANSI C432 x 559 mm43.2 × 55.9 cm17 x 22 in
ANSI D559 x 864 mm55.9 × 86.4 cm22 x 34 in
ANSI E864 x 1118 mm86.4 × 111.8 cm34 x 44 in
ARCH A229 x 305 mm22.9 × 30.5 cm9 x 12 in
ARCH B305 x 457 mm30.5 × 45.7 cm12 x 18 in
ARCH C457 x 610 mm45.7 × 61 cm18 x 24 in
ARCH D610 x 914 mm61 × 91.4 cm24 x 36 in
ARCH E914 x 1219 mm91.4 × 121.9 cm36 x 48 in
ARCH E1762 x 1067 mm76.2 × 106.7 cm30 x 42 in
ARCH E2660 x 965 mm66 × 96.5 cm26 x 38 in
ARCH E3686 x 991 mm68.6 × 99.1 cm27 x 39 in