EQUIVALENT WEIGHT TABLES
These tables provide weight in pounds for a ream of a common grade of paper and provides its basis weight and metric equivalent in grams per square meter (GSM).
BOOK
| BOOK 25 × 38 |
BOND 17 × 22 |
COVER 20 × 26 |
BRISTOL 22½ × 28½ |
INDEX 25½ × 30½ |
TAG 24 × 36 |
METRIC G/M² |
| 30 | 11.8 | 16.4 | 20.3 | 24.6 | 27.3 | 44 |
| 40 | 15.7 | 21.9 | 27 | 32.7 | 36.4 | 59 |
| 45 | 17.7 | 24.6 | 30.4 | 36.9 | 40.9 | 67 |
| 50 | 19.7 | 27.4 | 33.8 | 40.9 | 45.5 | 74 |
| 60 | 23.6 | 32.4 | 40.5 | 49.1 | 54.6 | 89 |
| 70 | 27.6 | 38.3 | 47.3 | 57.3 | 63.7 | 104 |
| 80 | 31.6 | 43.8 | 54 | 65.5 | 72.8 | 118 |
| 90 | 35.4 | 49.3 | 60.8 | 73.7 | 81.9 | 133 |
| 100 | 39.4 | 54.7 | 67.5 | 81.9 | 90.9 | 148 |
| 120 | 47.2 | 65.7 | 81 | 98.2 | 109.1 | 178 |
BOND
| BOOK 25 × 38 |
BOND 17 × 22 |
COVER 20 × 26 |
BRISTOL 22½ × 28½ |
INDEX 25½ × 30½ |
TAG 24 × 36 |
METRIC g/m² |
| 33 | 13 | 18.1 | 22.3 | 27 | 30 | 49 |
| 40.6 | 16 | 22.2 | 27.4 | 33.3 | 37 | 60 |
| 50.8 | 20 | 27.8 | 34.3 | 41.6 | 46.2 | 75 |
| 61 | 24 | 33.4 | 41.1 | 49.9 | 55.4 | 90 |
| 71.1 | 28 | 38.9 | 48 | 58.2 | 64.7 | 105 |
| 81.3 | 32 | 44.5 | 54.9 | 66.5 | 73.9 | 120 |
| 91.4 | 36 | 50.1 | 61.7 | 74.9 | 83.2 | 135 |
| 101.6 | 40 | 55.6 | 68.6 | 83.2 | 92.4 | 150 |
COVER
| BOOK 25 × 38 |
BOND 17 × 22 |
Cover 20 × 26 |
BRISTOL 22½ × 28½ |
INDEX 25½ × 30½ |
TAG 24 × 36 |
METRIC g/m² |
| 91.3 | 36 | 50 | 61.7 | 74.8 | 83.1 | 135 |
| 109.6 | 43.2 | 60 | 74 | 89.7 | 99.7 | 162 |
| 118.8 | 46.8 | 65 | 80.2 | 97.2 | 108 | 176 |
| 146.2 | 57.5 | 80 | 98.7 | 119.7 | 132.9 | 216 |
| 164.4 | 64.7 | 90 | 111 | 134.6 | 149.5 | 243 |
| 182.7 | 71.9 | 100 | 123.3 | 149.6 | 166.2 | 271 |
| 201 | 79.1 | 110 | 135.6 | 164.5 | 182.8 | 298 |
| 237.5 | 93.5 | 130 | 160.3 | 194.4 | 216 | 352 |
| 292.3 | 115.1 | 160 | 197.3 | 239.3 | 265.8 | 433 |
VELLUM
| BOOK 25 × 38 |
BOND 17 × 22 |
COVER 20 × 26 |
BRISTOL 22½ × 28½ |
INDEX 25½ × 30½ |
TAG 24 × 36 |
METRIC g/m² |
| 99.3 | 39.1 | 54.3 | 67 | 81.3 | 90.3 | 147 |
| 118.5 | 46.7 | 64.9 | 80 | 97 | 107.8 | 176 |
| 148.1 | 58.3 | 81.1 | 100 | 121.3 | 134.7 | 219 |
| 177.8 | 70 | 97.3 | 120 | 145.5 | 161.7 | 263 |
| 207.4 | 81.7 | 113.5 | 140 | 169.8 | 188.6 | 307 |
| 237 | 93.3 | 129.7 | 160 | 194.1 | 215.6 | 351 |
INDEX
| BOOK 25 × 38 |
BOND 17 × 22 |
COVER 20 × 26 |
BRISTOL 22½ × 28½ |
INDEX 25½ × 30½ |
TAG 24 × 36 |
METRIC g/m² |
| 109.9 | 43.3 | 60.2 | 74.2 | 90 | 100 | 163 |
| 134.4 | 52.9 | 73.5 | 90.7 | 110 | 122.2 | 199 |
| 171 | 67.3 | 93.6 | 115.4 | 140 | 155.5 | 253 |
| 207.7 | 81.7 | 113.7 | 140.2 | 170 | 188.9 | 307 |
TAG
| BOOK 25 × 38 |
BOND 17 × 22 |
COVER 20 × 26 |
BRISTOL 22½ × 28½ |
INDEX 25½ × 30½ |
TAG 24 × 36 |
METRIC g/m² |
| 110 | 43.3 | 60.2 | 74.2 | 90 | 100 | 163 |
| 137.4 | 54.1 | 75.2 | 92.8 | 112.5 | 125 | 204 |
| 164.9 | 64.9 | 90.3 | 111.3 | 135 | 150 | 244 |
| 192.4 | 75.8 | 105.3 | 129.9 | 157.5 | 175 | 285 |
| 219.9 | 86.6 | 120.4 | 148.4 | 180 | 200 | 326 |
| 274.9 | 108.2 | 150.5 | 185.5 | 225 | 250 | 407 |
Note: Relevant basis weights are in bold.
The numerical data in these tables are estimates only and are not guaranteed.
