Q:
# What Is the Unit Measure of Paper Thickness?

**Manufacturers measure paper thickness in units called "mils."** One mil is equal to one one-thousandth of an inch, and thicker paper provides better dispersal of ink. The name of this measurement for paper is its "caliper."

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Claire Cordier
Dorling Kindersley
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Consumers sometimes make the mistake of assuming that paper's weight is an indicator of its thickness. Weight indicates the pounds of a 500 sheet ream of paper cut to its standard size. Different types of paper have different standard sizes. Accordingly, 80-pound cover stock paper is a different thickness than 80-pound bond paper. Caliper offers the most reliable method of comparing thickness, especially when comparing paper of different types.

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