Paper weight
400 gsm paper
400 gsm paper equals 106.4 lb bond, 270.2 lb text or 147.9 lb cover. Typical uses: luxury business cards, packaging, rigid tags. Very heavy board; usually needs specialist finishing.
106.4 lbbond / writing
270.2 lbtext / book
147.9 lbcover
≈ 500 µmthickness (uncoated)
Equivalent US basis weights
| Grade | Pounds | Basic sheet |
|---|---|---|
| Bond / Writing | 106.4 lb | 17 x 22 in |
| Text / Book / Offset | 270.2 lb | 25 x 38 in |
| Cover | 147.9 lb | 20 x 26 in |
| Index | 221.2 lb | 25.5 x 30.5 in |
| Bristol | 182.4 lb | 22.5 x 28.5 in |
| Newsprint / Tag | 245.8 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 | 500 µm | 19.7 pt | 102 PPI | 2.953 in |
| Bulky book paper | 600 µm | 23.6 pt | 85 PPI | 3.543 in |
| Coated (gloss/silk) | 360 µm | 14.2 pt | 141 PPI | 2.126 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 | 24.95 g | 12.47 kg |
| US Letter | 24.13 g | 26.6 lb |
What it is used for
Luxury business cards, packaging, rigid tags. Very heavy board; usually needs specialist finishing.