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Equivalent Weight Chart and Envelope Sizes

Equivalency Chart

TEXT COVER POINTS  CALIPER METRIC
(gsm)
40 22 3.2 0.0032 60.2
45 24 3.6 0.0036 67.72
50 28 3.8 0.0038 75.2
60 33 4.8 0.0048 90.3
70 39 5.8 0.0058 105.35
80 45 6.1 0.0061 116.63
90 48 6.2 0.0062 131.68
90 50 6.8 0.0068 135.45
100 56 7.3 0.0073 150.5
110 61 7.6 0.0076 165.55
120 65 8 0.0078 176.83
146 80 9.5 0.0092 218.22
165 90 10 0.0095 244.56
183 100 11 0.011 270.9
192 105 13 0.013 285.95
208 114 14 0.014 308.52
220 120 15 0.015 312

The darker colored boxes above represent
the "most common paper weights" for that category.
Envelope Sizes

Commercial / Official Sizes
( Commercial Flap; unless noted)
No. Inches Millimeters
6 1/4 3 1/2 x 6 89 x 152
6 3/4 3 5/8 x 6 1/2 92 x 165
7 3 3/4 x 6 3/4 95 x 171
Monarch (pointed Flap) 3 7/8 x 7 1/2 98 x 191
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 (also Square Flap) 4 1/8 x 9 1/2 105 x 241
11 (also Square Flap) 4 1/2 x 10 3/8 114 x 264
12 (also Square Flap) 4 3/4 x 11 121 x 279
14 (also Square Flap) 5 x 11 1/2 127 x 292
 
Booklet (Wallet Flap)
No. Inches Millimeters
3 4 3/4 x 6 1/2 121 x 165
5 5 1/2 x 8 1/8 140 x 206
6 5 3/4 x 8 7/8 146 x 225
6 1/2 6 x 9 152 x 229
6 5/8 6 x 9 1/2 152 x 241
6 3/4 6 1/2 x 9 1/2 165 x 241
7 1/4 7 x 10 178 x 254
7 1/2 7 1/2 x 10 1/2 191 x 267
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
 
Window (Commercial Flap)
No. Inches Millimeters
6 1/4 3 1/2 x 6 89 x 152
6 3/4 3 5/8 x 6 1/2 92 x 165
7 3 3/4 x 6 3/4 95 x 171
Monarch 3 7/8 x 7 1/2 98 x 191
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
 
Announcement (Square Flap)
No. Inches Millimeters
A-2 4 3/8 x 5 3/4 111 x 146
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-9 5 3/4 x 8 3/4  
A-10 6 x 9 1/2 152 x 241
Slimline 3 7/8 x 8 7/8 98 x 225
 
Baronial (Pointed Flap)
No. Inches Millimeters
4 3 5/8 x 5 1/8 92 x 130
5 4 1/8 x 5 1/2 105 x 140
5 1/2 4 3/8 x 5 3/4 111 x 146
6 4 3/4 x 6 1/2 121 x 165
Lee 5 1/4 x 7 1/4 133 x 184