The weight of paper is measured as paper weight or ream weight.
Paper weight is the weight of one square meter of a sheet of paper, measured in units of g/m2. Ream weight is the weight in pounds of 500 sheets of the paper. The basic size varies depending on the type (grade) of paper.
The basic sizes for each grade are as follow:
Bond, Ledger: 17" × 22"
Offset, Text: 25" × 38"
Cover: 20" × 26"
Index: 251/2" × 301/2"
Ream weight can be calculated using the following equation:
Ream weight (lb.) = paper weight (g/m2) × dimension of paper (m2/sheet) × 500 (sheets)
The following table shows the relationship between paper weight and ream weight:
Ream weight |
||||
---|---|---|---|---|
Paper weight (g/m2) |
Bond / Ledger (lb.) |
Offset / Text (lb. text) |
Cover (lb. cover) |
Index (lb. index) |
52 |
14 |
36 |
20 |
29 |
60 |
16 * |
40 * |
22 |
33 |
75 |
20 * |
50 * |
28 |
42 |
90 |
24 * |
60 * |
33 |
50 |
105 |
28 * |
70 * |
39 |
58 |
108 |
29 |
73 |
40 * |
60 |
118 |
31 |
80 * |
44 |
65 |
120 |
32 * |
81 |
45 |
67 |
135 |
36 |
90 |
50 * |
75 |
148 |
39 |
100 * |
55 |
82 |
162 |
43 |
110 |
60 * |
90 * |
176 |
47 |
120 |
65 * |
97 |
199 |
53 |
135 |
74 |
110 * |
216 |
58 |
146 |
80 * |
120 |
244 |
65 |
165 |
90 * |
135 |
253 |
67 |
171 |
94 |
140 * |
256 |
68 |
173 |
95 |
142 |
270 |
72 |
183 |
100 * |
150 |
297 |
79 |
201 |
110 * |
165 |
307 |
82 |
208 |
114 |
170 * |
325 |
87 |
220 |
120 |
180 * |
351 |
94 |
237 |
130 * |
194 |
398 |
106 |
269 |
147 |
220 * |
405 |
108 |
274 |
150 |
224 |
Asterisks (*) indicate the most common weights for that category.