Q: What does the paper weight numbers mean?
A: Papers are classified into categories, then based on the total weight of 500 sheets of a specific size. The problem is that the size is not the same for each category (see paper category table below). That is why you may get the impression that 24# Text is much lighter than 60# book. And that 60# book must be close to the same weight as 65# Cover. You would be wrong: The following show paper weight equivalents for just a few of the available paper weights.

Book Bond, Text Cover Vellum Bristol Index Tag
24# 60# 33# 22# 49# 55#
119# 47# 65# 80# 97# 108#
99# 39# 54# 67# 81# 90#
146# 58# 80# 99# 120# 133#
110# 43# 60# 74# 90# 100#
135# 53# 74# 91# 110# 122#
PAPER CATEGORY BASIS ON THE WEIGHT
OF 500 SHEETS OF
Book 25" x 35"
Bond, Text 17" x 22"
Cover 20" x 26"
Vellum Bristol 22-1/2" x 28-1/2"
Index 25-1/2" x 30-1/2"
Tag 24" x 36"

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