10 1/2 (Catalog) Envelope Size Size

According to 10 1/2 (Catalog) Envelope Size format envelope size, the width of the envelope is 305mm(12 inches) and the height is 229mm(9 inches), as shown in the picture on the right.

Format/name 10 1/2 (Catalog) Envelope Size
Width(mm) 305 mm
Width(in) 12 inches
Height(mm) 229 mm
Height(in) 9 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 10 1/2 (Catalog) Envelope Size format is approximately 3.6 times the width of the credit card and approximately 4.2 times the height of the credit card.

305mm envelope width and height 229 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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