Paper weight
64 gsm paper
64 gsm paper equals 17 lb bond, 43.2 lb text or 23.7 lb cover. Typical uses: book interiors (lightweight), notebooks, forms. Common in mass-market and long paperbacks to control thickness and postage.
17 lbbond / writing
43.2 lbtext / book
23.7 lbcover
≈ 80 µmthickness (uncoated)
Equivalent US basis weights
| Grade | Pounds | Basic sheet |
|---|---|---|
| Bond / Writing | 17 lb | 17 x 22 in |
| Text / Book / Offset | 43.2 lb | 25 x 38 in |
| Cover | 23.7 lb | 20 x 26 in |
| Index | 35.4 lb | 25.5 x 30.5 in |
| Bristol | 29.2 lb | 22.5 x 28.5 in |
| Newsprint / Tag | 39.3 lb | 24 x 36 in |
Estimated thickness and pages per inch
| Paper type | Caliper | Points (mil) | Pages per inch | Spine for 300 pp |
|---|---|---|---|---|
| Uncoated offset | 80 µm | 3.1 pt | 635 PPI | 0.472 in |
| Bulky book paper | 96 µm | 3.8 pt | 529 PPI | 0.567 in |
| Coated (gloss/silk) | 58 µm | 2.3 pt | 882 PPI | 0.34 in |
Caliper ≈ grammage × bulk. Ask your printer for the measured caliper of the actual stock.
Sheet and ream weights
| Sheet | One sheet | Ream (500 sheets) |
|---|---|---|
| A4 | 3.99 g | 2 kg |
| US Letter | 3.86 g | 4.3 lb |
What it is used for
Book interiors (lightweight), notebooks, forms. Common in mass-market and long paperbacks to control thickness and postage.