Emma Davis Print Production Specialist at 4OVER4.COM
Emma is our prepress and print production voice, built from the knowledge of our production team, with over 20 years in printing.
Question
How do I convert GSM to basis weight in pounds?
Answer
There is no single formula, because pound-based basis weight depends on the paper category (bond, text, cover, index), and each one is measured at a different sheet size. The most reliable approach is a conversion chart matched to the exact category you are using.
| GSM | Approx. cover weight |
|---|---|
| 216 GSM | ~80 lb cover |
| 270 GSM | ~100 lb cover |
| 300 GSM | ~110 lb cover |
- These figures apply to cover stock only. Text, bond, and index categories convert at very different ratios.
- When comparing quotes or samples, confirm both the GSM and the category so you are matching like with like.
- For anything critical, request a physical sample rather than relying on the number alone.
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