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Dimensions of US Envelope Paper Sizes | 6¼, 6¾, 7, 7¾ etc.

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Dimensions of US Envelope Paper Sizes | 6¼, 6¾, 7, 7¾ etc. Paper size
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There are dozens of sizes of envelopes available.

The designations such as “A2” do not correspond to ISO paper sizes. (Often, North American paper jobbers and printers will insert a hyphen to distinguish from ISO sizes, thus: A-2.)

 

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US Envelope Paper Sizes

 

Format Width × Height (in) Width × Height (mm)
6 × 3.5 in 152 × 89 mm
6.5 × 3.6 in 165 × 92 mm
7 6.8 × 3.7 in 172 × 95 mm
7¾ Monarch 7.5 × 3.9 in 191 × 98 mm
8⅝ 8.6 × 3.6 in 219 × 92 mm
9 8.9 × 3.9 in 225 × 98 mm
10 9.5 × 4.1 in 241 × 104 mm
11 10.4 × 4.5 in 264 × 114 mm
12 11 × 4.8 in 279 × 121 mm
14 11.5 × 5 in 292 × 127 mm
16 12 × 6 in 305 × 152 mm
A1 3.6 × 5.1 in 92 × 130 mm
A2 Lady Grey 5.7 × 4.4 in 146 × 111 mm
A4 6.3 × 4.3 in 159 × 108 mm
A6 Thompson’s Standard 6.5 × 4.8 in 165 × 121 mm
A7 Besselheim 7.2 × 5.2 in 184 × 133 mm
A8 Carr’s 8.1 × 5.5 in 206 × 140 mm
A9 Diplomat 8.7 × 5.7 in 222 × 146 mm
A10 Willow 9.5 × 6 in 241 × 152 mm
A Long 8.9 × 3.9 in 225 × 98 mm
1 9 × 6 in 229 × 152 mm
9.5 × 6 in 241 × 152 mm
3 10 × 7 in 254 × 178 mm
6 10.5 × 7.5 in 267 × 191 mm
8 11.3 × 8.3 in 286 × 210 mm
11.3 × 8.7 in 286 × 222 mm
10½ 12 × 9 in 305 × 229 mm
12½ 12.5 × 9.5 in 318 × 241 mm
13½ 13 × 10 in 330 × 254 mm
14½ 14.5 × 11.5 in 368 × 292 mm
15 15 × 10 in 381 × 254 mm
15½ 15.5 × 12 in 394 × 305 mm

 

The No. 10 envelope is the standard business envelope size in the United States.

Envelopes accepted by the U.S. Postal Service for mailing at the price of a letter must be:

  • Rectangular
  • At least ​3 12 inches high × 5 inches long × 0.007 inch thick.
  • No more than ​6 18 inches high × ​11 12 inches long × ​14 inch thick.
  • Letters that have a length-to-height aspect ratio of less than 1.3 or more than 2.5 are classified as “non-machinable” by the USPS and may cost more to mail.

 

 

 

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