Paper weight
100 gsm paper
100 gsm paper equals 26.6 lb bond, 67.6 lb text or 37 lb cover. Typical uses: premium book text, letterhead, colour interiors. Heavier text paper with better opacity — good for illustrated or colour books.
26.6 lbbond / writing
67.6 lbtext / book
37 lbcover
≈ 125 µmthickness (uncoated)
Equivalent US basis weights
| Grade | Pounds | Basic sheet |
|---|---|---|
| Bond / Writing | 26.6 lb | 17 x 22 in |
| Text / Book / Offset | 67.6 lb | 25 x 38 in |
| Cover | 37 lb | 20 x 26 in |
| Index | 55.3 lb | 25.5 x 30.5 in |
| Bristol | 45.6 lb | 22.5 x 28.5 in |
| Newsprint / Tag | 61.4 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 | 125 µm | 4.9 pt | 406 PPI | 0.738 in |
| Bulky book paper | 150 µm | 5.9 pt | 339 PPI | 0.886 in |
| Coated (gloss/silk) | 90 µm | 3.5 pt | 564 PPI | 0.531 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 | 6.24 g | 3.12 kg |
| US Letter | 6.03 g | 6.6 lb |
What it is used for
Premium book text, letterhead, colour interiors. Heavier text paper with better opacity — good for illustrated or colour books.