Paper weight
90 gsm paper
90 gsm paper equals 23.9 lb bond, 60.8 lb text or 33.3 lb cover. Typical uses: premium book text, letterhead, colour interiors. Heavier text paper with better opacity — good for illustrated or colour books.
23.9 lbbond / writing
60.8 lbtext / book
33.3 lbcover
≈ 112 µmthickness (uncoated)
Equivalent US basis weights
| Grade | Pounds | Basic sheet |
|---|---|---|
| Bond / Writing | 23.9 lb | 17 x 22 in |
| Text / Book / Offset | 60.8 lb | 25 x 38 in |
| Cover | 33.3 lb | 20 x 26 in |
| Index | 49.8 lb | 25.5 x 30.5 in |
| Bristol | 41 lb | 22.5 x 28.5 in |
| Newsprint / Tag | 55.3 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 | 112 µm | 4.4 pt | 452 PPI | 0.664 in |
| Bulky book paper | 135 µm | 5.3 pt | 376 PPI | 0.797 in |
| Coated (gloss/silk) | 81 µm | 3.2 pt | 627 PPI | 0.478 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 | 5.61 g | 2.81 kg |
| US Letter | 5.43 g | 6 lb |
What it is used for
Premium book text, letterhead, colour interiors. Heavier text paper with better opacity — good for illustrated or colour books.