Paper types are categorized by their base size in the US. For example, the base size of a Cover paper is 20x26 while a Bond base size is 17x22 and Text is 25x38. These base sizes are used to calculate a paper's basis weight. The basis weight equals the ream (500 sheet) weight of the base size, hence the term basis weight. Because the starting base size is not the same between paper types, the basis weights do not correspond directly (80 Text is much lighter than 80 Cover). Below is a chart that provides the equivalent basis weights between paper types as well as the corresponding g/m².
Bond (Basis 17 x 22)
| Bond |
Cover |
Index |
Bristol |
Tag |
Text |
g/m² |
|
16
|
22
|
33
|
27
|
37
|
41
|
60
|
|
20
|
28
|
42
|
34
|
46
|
51
|
75
|
|
24
|
33
|
50
|
41
|
55
|
61
|
90
|
|
28
|
39
|
59
|
48
|
65
|
71
|
105
|
|
32
|
45
|
67
|
55
|
74
|
81
|
120
|
|
36
|
50
|
75
|
62
|
83
|
91
|
135
|
Cover (Basis 20 x 26)
| Cover |
Bond |
Index |
Bristol |
Tag |
Text |
g/m² |
|
50
|
36
|
75
|
62
|
83
|
91
|
135
|
|
60
|
43
|
90
|
74
|
100
|
110
|
162
|
|
65
|
47
|
97
|
80
|
108
|
119
|
176
|
|
80
|
58
|
120
|
99
|
133
|
146
|
216
|
|
90
|
65
|
135
|
111
|
150
|
164
|
243
|
|
100
|
72
|
150
|
123
|
166
|
183
|
270
|
|
110
|
79
|
165
|
135
|
183
|
201
|
297
|
|
130
|
94
|
194
|
160
|
216
|
238
|
352
|
Index (Basis 25-1/2 x 30-1/2)
| Index |
Bond |
Cover |
Bristol |
Tag |
Text |
g/m² |
|
90
|
43
|
60
|
74
|
100
|
110
|
163
|
|
110
|
53
|
74
|
91
|
122
|
134
|
199
|
|
140
|
67
|
93
|
115
|
155
|
171
|
253
|
|
170
|
82
|
114
|
140
|
189
|
208
|
307
|
Bristol (Basis 22-1/2 x 28-1/2)
| Bristol |
Bond |
Cover |
Index |
Tag |
Text |
g/m² |
|
67
|
39
|
54
|
81
|
89
|
99
|
147
|
|
80
|
47
|
65
|
97
|
108
|
119
|
176
|
|
100
|
58
|
81
|
121
|
135
|
148
|
219
|
|
120
|
70
|
97
|
146
|
162
|
178
|
263
|
Text (Basis 25 x 38)
| Text |
Bond |
Cover |
Index |
Bristol |
Tag |
g/m² |
|
40
|
16
|
21
|
33
|
27
|
37
|
60
|
|
50
|
20
|
27
|
41
|
34
|
45
|
74
|
|
60
|
24
|
32
|
49
|
40
|
55
|
89
|
|
70
|
28
|
38
|
57
|
47
|
64
|
104
|
|
80
|
31
|
43
|
66
|
54
|
73
|
118
|
|
90
|
35
|
48
|
74
|
60
|
82
|
133
|
|
100
|
39
|
54
|
82
|
67
|
91
|
148
|
Tag (Basis 24 x 36)
| Tag |
Bond |
Cover |
Index |
Bristol |
Text |
g/m² |
|
100
|
44
|
60
|
90
|
75
|
110
|
163
|
|
125
|
55
|
75
|
113
|
93
|
137
|
204
|
|
150
|
66
|
90
|
135
|
112
|
165
|
244
|
|
175
|
77
|
105
|
157
|
130
|
192
|
285
|
|
200
|
88
|
120
|
180
|
149
|
220
|
326
|
