Paper weight
280 gsm paper
280 gsm paper equals 74.5 lb bond, 189.2 lb text or 103.5 lb cover. Typical uses: business cards, premium covers, invitations. Firm card that holds its shape; scoring is essential for folding.
74.5 lbbond / writing
189.2 lbtext / book
103.5 lbcover
≈ 350 µmthickness (uncoated)
Equivalent US basis weights
| Grade | Pounds | Basic sheet |
|---|---|---|
| Bond / Writing | 74.5 lb | 17 x 22 in |
| Text / Book / Offset | 189.2 lb | 25 x 38 in |
| Cover | 103.5 lb | 20 x 26 in |
| Index | 154.9 lb | 25.5 x 30.5 in |
| Bristol | 127.7 lb | 22.5 x 28.5 in |
| Newsprint / Tag | 172 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 | 350 µm | 13.8 pt | 145 PPI | 2.067 in |
| Bulky book paper | 420 µm | 16.5 pt | 121 PPI | 2.48 in |
| Coated (gloss/silk) | 252 µm | 9.9 pt | 202 PPI | 1.488 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 | 17.46 g | 8.73 kg |
| US Letter | 16.89 g | 18.6 lb |
What it is used for
Business cards, premium covers, invitations. Firm card that holds its shape; scoring is essential for folding.