Paper weight
40 gsm paper
40 gsm paper equals 10.6 lb bond, 27 lb text or 14.8 lb cover. Typical uses: bible / india paper, dictionaries, pharmaceutical inserts. Very thin and opaque for its weight; used where page count is enormous.
10.6 lbbond / writing
27 lbtext / book
14.8 lbcover
≈ 50 µmthickness (uncoated)
Equivalent US basis weights
| Grade | Pounds | Basic sheet |
|---|---|---|
| Bond / Writing | 10.6 lb | 17 x 22 in |
| Text / Book / Offset | 27 lb | 25 x 38 in |
| Cover | 14.8 lb | 20 x 26 in |
| Index | 22.1 lb | 25.5 x 30.5 in |
| Bristol | 18.2 lb | 22.5 x 28.5 in |
| Newsprint / Tag | 24.6 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 | 50 µm | 2 pt | 1,016 PPI | 0.295 in |
| Bulky book paper | 60 µm | 2.4 pt | 847 PPI | 0.354 in |
| Coated (gloss/silk) | 36 µm | 1.4 pt | 1,411 PPI | 0.213 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 | 2.49 g | 1.25 kg |
| US Letter | 2.41 g | 2.7 lb |
What it is used for
Bible / India paper, dictionaries, pharmaceutical inserts. Very thin and opaque for its weight; used where page count is enormous.