How do I convert GSM to basis weight in pounds?

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.

• 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.