Envelope Sizes

Not all sizes and styles are available in all types of paper.
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Window
6 1/4	3 1/2 x 6	89 x 152	For invoices, statements, etc.; die-cut glassine-backed window permits name and address on enclosure to show; Standard window is 4 3/4" wide x 1 1/8" (121 mm x 29 mm); Window position is 7/8" (22 mm) from left edge, 5/8" (16 mm) from bottom (for No. 8 5/8, position is 5/8" [16 mm] from left edge, 13/16" [21 mm] from bottom)
6 3/4	3 5/8 x 6 1/2	92 x 165
7	3 3/4 x 6 3/4	95 x 171
7 3/4	3 7/8 x 7 1/2	98 x 190
8 5/8	3 5/8 x 8 5/8	92 x 219
9	3 7/8 x 8 7/8	98 x 225
10	4 1/8 x 9 1/2	105 x 241
11	4 1/2 x 10 3/8	114 x 264
12	4 3/4 x 11	121 x 279
14	5 x 11 1/2	127 x 292

Remittance
6 1/4	3 1/2 x 6	89 x 152	Extradeep flap (between 3 3/8" [86 mm] and 3 1/2" [89 mm]) can carry printed message
6 1/2	3 1/2 x 6 1/4	89 x 159
6 3/4	3 5/8 x 6 1/2	92 x 165
9	3 7/8 x 8 7/8	98 x 225

Announcement Square Flap
A-2	4 3/8 x 5 3/4	111 x 146	Made with matching text paper Basically square in shape
A-6	4 3/4 x 6 1/2	121 x 165
A-7	5 1/4 x 7 1/4	133 x 184
A-8	5 1/2 x 8 1/8	140 x 206
A-10	6 x 9 1/2	152 x 241
Slim	3 7/8 x 8 7/8	98 x 225

Baronial
2	3 3/16 x 4 1/4	81 x 108	For formal correspondence, invitations, announcements, greeting cards Deep pointed flap
4	3 5/8 x 4 5/8	92 x 117
5	4 1/8 x 5 1/8	105 x 130
5 1/4	4 1/4 x 5 1/4	108 x 133
5 1/2	4 3/8 x 5 5/8	111 x 143
6	5 x 6 1/4	127 x 159

Booklet or Open Side
2 1/2	4 1/2 x 5 7/8	114 x 149	For booklets, folders, direct mail
3	4 3/4 x 6 1/2	121 x 165
4 1/4	5 x 7 1/2	127 x 190
4 1/2	5 1/2 x 7 1/2	140 x 190
5	5 1/2 x 8 1/2	140 x 216
6	5 3/4 x 8 7/8	146 x 225
6 1/2	6 x 9	152 x 229
6 3/4	6 1/2 x 9 1/2	165 x 241
7	6 1/4 x 9 5/8	159 x 244
7 1/4	7 x 10	178 x 254
7 1/2	7 1/2 x 10 1/2	190 x 267
8	8 x 11 1/8	203 x 283
9	8 3/4 x 11 1/2	222 x 292
9 1/2	9 x 12	229 x 305
10	9 1/2 x 12 5/8	241 x 321
13	10 x 13	254 x 330

Catalogue or Open End
1	6 x 9	152 x 229	For catalogues, booklets, magazines, reports Opening/flap on short dimension
1 3/4	6 1/2 x 9 1/2	165 x 241
2	6 1/2 x 10	165 x 254
3	7 x 10	178 x 254
6	7 1/2 x 10 1/2	190 x 267
7	8 x 11	203 x 279
8	8 1/4 x 11 1/4	210 x 286
9 1/2	8 1/2 x 10 1/2	216 x 267
9 3/4	8 3/4 x 11 1/4	222 x 286
10 1/2	9 x 12	229 x 305
12 1/2	9 1/2 x 12 1/2	241 x 317
13 1/2	10 x 13	254 x 330
14 1/4	11 1/4 x 14 1/4	286 x 362
14 1/2	11 1/2 x 14 1/2	292 x 368

Metal Clasp & String-and-Button
0	2 1/2 x 4 1/4	63 x 108	For mailing bulky papers Heavy-weight paper Opening/flap on short dimension
5	3 1/8 x 5 1/2	79 x 140
10	3 3/8 x 6	86 x 152
11	4 1/2 x 10 3/8	114 x 264
14	5 x 11 1/2	127 x 292
15	4 x 6 3/8	102 x 162
25	4 5/8 x 6 3/4	117 x 171
35	5 x 7 1/2	127 x 190
50	5 1/2 x 8 1/4	140 x 210
55	6 x 9	152 x 229
63	6 1/2 x 9 1/2	165 x 241
68	7 x 10	178 x 254
75	7 1/2 x 10	190 x 254
80	8 x 11	203 x 279
83	8 1/2 x 11 1/2	216 x 292
87	8 3/4 x 11 1/4	222 x 286
90	9 x 12	229 x 305
93	9 1/2 x 12 1/2	241 x 317
94	9 1/4 x 14 1/2	235 x 368
95	10 x 12	254 x 305
97	10 x 13	254 x 330
98	10 x 15	254 x 381
105	11 1/2 x 14 1/2	292 x 368

Inch measurements are the finished envelope size.

Metric measurements are approximate
(calculated at 1 inch = 25.4 mm and rounded off).

Except where noted, the envelope opening/flap is on the long dimension.