C7/C6 (International) Envelope Size Size

According to C7/C6 (International) Envelope Size format envelope size, the width of the envelope is 81mm(3.2 inches) and the height is 162mm(6.4 inches), as shown in the picture on the right.

Format/name C7/C6 (International) Envelope Size
Width(mm) 81 mm
Width(in) 3.2 inches
Height(mm) 162 mm
Height(in) 6.4 inches

Taking our commonly used credit cards as a reference, the size of the credit card is 85.6 mm x 53.98 mm (3.4 in X 2.1 in). The photo size in C7/C6 (International) Envelope Size format is approximately 0.9 times the width of the credit card and approximately 3 times the height of the credit card.

81mm envelope width and height 162 mm

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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