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The US envelope standard has not been adopted by the ISO and is used mainly in the USA. These standards were developed to hold paper and later on both magazines and brochures of a certain size. For the most part, the US Envelope standard was developed to hold US paper sizes.

FormatWidth × Height (mm)Width × Height (cm)Width × Height (in)
6¼152 × 89 mm15.2 × 8.9 cm6 × 3.5 in
6¾165 × 92 mm16.5 × 9.2 cm6.5 × 3.6 in
7172 × 95 mm17.2 × 9.5 cm6.8 × 3.7 in
7¾ Monarch191 × 98 mm19.1 × 9.8 cm7.5 × 3.9 in
8⅝219 × 92 mm21.9 × 9.2 cm8.6 × 3.6 in
9225 × 98 mm22.5 × 9.8 cm8.9 × 3.9 in
10241 × 104 mm24.1 × 10.4 cm9.5 × 4.1 in
11264 × 114 mm26.4 × 11.4 cm10.4 × 4.5 in
12279 × 121 mm27.9 × 12.1 cm11 × 4.8 in
14292 × 127 mm29.2 × 12.7 cm11.5 × 5 in
16305 × 152 mm30.5 × 15.2 cm12 × 6 in
A192 × 130 mm9.2 × 13 cm3.6 × 5.1 in
A2 Lady Grey146 × 111 mm14.6 × 11.1 cm5.7 × 4.4 in
A4159 × 108 mm15.9 × 10.8 cm6.3 × 4.3 in
A6 Thompson’s Standard165 × 121 mm16.5 × 12.1 cm6.5 × 4.8 in
A7 Besselheim184 × 133 mm18.4 × 13.3 cm7.2 × 5.2 in
A8 Carr’s206 × 140 mm20.6 × 14 cm8.1 × 5.5 in
A9 Diplomat222 × 146 mm22.2 × 14.6 cm8.7 × 5.7 in
A10 Willow241 × 152 mm24.1 × 15.2 cm9.5 × 6 in
A Long225 × 98 mm22.5 × 9.8 cm8.9 × 3.9 in
1229 × 152 mm22.9 × 15.2 cm9 × 6 in
1¾241 × 152 mm24.1 × 15.2 cm9.5 × 6 in
3254 × 178 mm25.4 × 17.8 cm10 × 7 in
6267 × 191 mm26.7 × 19.1 cm10.5 × 7.5 in
8286 × 210 mm28.6 × 21 cm11.3 × 8.3 in
9¾286 × 222 mm28.6 × 22.2 cm11.3 × 8.7 in
10½305 × 229 mm30.5 × 22.9 cm12 × 9 in
12½318 × 241 mm31.8 × 24.1 cm12.5 × 9.5 in
13½330 × 254 mm33 × 25.4 cm13 × 10 in
14½368 × 292 mm36.8 × 29.2 cm14.5 × 11.5 in
15381 × 254 mm38.1 × 25.4 cm15 × 10 in
15½394 × 305 mm39.4 × 30.5 cm15.5 × 12 in