Envelope Sizes

Book size cover

The standard envelope size is defined by the international standard ISO 269, but this standard has now been revoked and replaced with the ISO 216 standard, the paper size standard. Among the international standard sizes, the B series and C series are used more, and the DL format envelopes are the most used in commercial use.

The envelope sizes of US & North American are more diverse than those under the ISO 216 standard. They are mainly divided into three categories: Commercial envelopes, Announcement envelopes and Catalog envelopes. Commercial envelopes are long and thin and suitable for use in offices and commercial occasions. Usually, the ratio of the short side to the long side (aspect ratio) is between 1:1.6 and 1:2.2.

Announcement envelopes are also called A-style or A-series envelopes. They are mainly used for personal use, including photos, greeting cards, etc. The most famous ones are Lady Gray (A2) and Diplomat (A9).

Catalog envelopes are designed for catalogs, brochures and other heavier content. The aspect ratio of catalog envelopes is between 1:1.3 and 1:1.5.

All envelope sizes are shown in the table below.

ISO 216 is an international standard for paper sizes, used across the world except in North America and parts of Latin America. The standard defines the "A", "B" and "C" series of paper sizes, including A4, the most commonly available paper size worldwide.

North American Standard Envelope Sizes

Format Width × Height (mm) Width × Height (cm) Width × Height (in)
6 1/4 (Commercial) 152 × 89 mm 15.2 × 8.9 cm 6 × 3.5 in
6 3/4(Commercial) 165 × 92 mm 16.5 × 9.2 cm 6.5 × 3.6 in
7 (Commercial) 172 × 95 mm 17.2 × 9.5 cm 6.8 × 3.7 in
7 3/4 Monarch (Commercial) 191 × 98 mm 19.1 × 9.8 cm 7.5 × 3.9 in
8 5/8(Commercial) 219 × 92 mm 21.9 × 9.2 cm 8.6 × 3.6 in
9(Commercial) 225 × 98 mm 22.5 × 9.8 cm 8.9 × 3.9 in
10(Commercial) 241 × 104 mm 24.1 × 10.4 cm 9.5 × 4.1 in
11(Commercial) 264 × 114 mm 26.4 × 11.4 cm 10.4 × 4.5 in
12(Commercial) 279 × 121 mm 27.9 × 12.1 cm 11 × 4.8 in
14(Commercial) 292 × 127 mm 29.2 × 12.7 cm 11.5 × 5 in
16(Commercial) 305 × 152 mm 30.5 × 15.2 cm 12 × 6 in
A1 (Announcement) 92 × 130 mm 9.2 × 13 cm 3.6 × 5.1 in
A2 Lady Grey (Announcement) 146 × 111 mm 14.6 × 11.1 cm 5.7 × 4.4 in
A4 (Announcement) 159 × 108 mm 15.9 × 10.8 cm 6.3 × 4.3 in
A6 Thompson's Standard
(Announcement)
165 × 121 mm 16.5 × 12.1 cm 6.5 × 4.8 in
A7 Besselheim
(Announcement)
184 × 133 mm 18.4 × 13.3 cm 7.2 × 5.2 in
A8 Carr's (Announcement) 206 × 140 mm 20.6 × 14 cm 8.1 × 5.5 in
A9 Diplomat (Announcement) 222 × 146 mm 22.2 × 14.6 cm 8.7 × 5.7 in
A10 Willow (Announcement) 241 × 152 mm 24.1 × 15.2 cm 9.5 × 6 in
A Long (Announcement) 225 × 98 mm 22.5 × 9.8 cm 8.9 × 3.9 in
1 (Catalog) 229 × 152 mm 22.9 × 15.2 cm 9 × 6 in
1 3/4 (Catalog) 241 × 152 mm 24.1 × 15.2 cm 9.5 × 6 in
3 (Catalog) 254 × 178 mm 25.4 × 17.8 cm 10 × 7 in
6 (Catalog) 267 × 191 mm 26.7 × 19.1 cm 10.5 × 7.5 in
8 (Catalog) 286 × 210 mm 28.6 × 21 cm 11.3 × 8.3 in
9 3/4 (Catalog) 286 × 222 mm 28.6 × 22.2 cm 11.3 × 8.7 in
10 1/2 (Catalog) 305 × 229 mm 30.5 × 22.9 cm 12 × 9 in
12 1/2 (Catalog) 318 × 241 mm 31.8 × 24.1 cm 12.5 × 9.5 in
13 1/2 (Catalog) 330 × 254 mm 33 × 25.4 cm 13 × 10 in
14 1/2 (Catalog) 368 × 292 mm 36.8 × 29.2 cm 14.5 × 11.5 in
15 (Catalog) 381 × 254 mm 38.1 × 25.4 cm 15 × 10 in
15 1/2 (Catalog) 394 × 305 mm 39.4 × 30.5 cm 15.5 × 12 in

International Standard Envelope Sizes

Format Width × Height (mm) Width × Height (cm) Width × Height (in) AR
DL 110 × 220 11 × 22 4.3 x 8.7 2∶1
C7 81 × 114 8.1 × 11.4 3.2 x 4.5 √2∶1
C7/C6 81 × 162 8.1 × 16.2 3.2 × 6.4 2∶1
C6 114 × 162 11.4 × 16.2 4.5 × 6.4 √2∶1
C6/C5 114 × 229 11.4 × 22.9 4.5 × 9 2∶1
C5 162 × 229 16.2 × 22.9 6.4 × 9 √2∶1
C4 229 × 324 22.9 × 32.4 9 × 12.8 √2∶1
C3 324 × 458 32.4 × 45.8 12.8 × 18 √2∶1
B6 125 × 176 12.5 × 17.6 4.9 × 6.9 √2∶1
B5 176 × 250 17.6 × 25 6.9 × 9.8 √2∶1
B4 250 × 353 25 × 35.3 9.8 × 13.9 √2∶1
E4 280 × 400 28 × 40 11 × 15.7 10∶7

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