Leaf & Spine

Free calculator

GSM to lb Paper Weight Converter

Convert paper weight between g/m² and US basis weights — bond, text (book), cover, index and bristol — with estimated thickness.

—Grammage
—Bond
—Text / book
—Cover
—Index
—Bristol
—Thickness

How it works

US paper weights are the weight of 500 sheets at each grade's basic size, so the same paper has different numbers in different grades. Grammage avoids the confusion: it is simply grams per square metre.

Frequently asked questions

Is 20 lb paper the same as 75 gsm?
20 lb bond is about 75 g/m² — ordinary copy paper.
What is 100 lb text in gsm?
About 148 g/m².

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