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# What is the unit measure of paper thickness?

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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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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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A common unit of measure for an object's mass is the metric unit grams. However, mass is often confused with weight, which are similar ideas but different characteristics of an object.

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In the metric system, the joule is the unit of measure for work. In physics, a force does work on an object when the object moves in the direction of the force. The formula for work states that it is equal to a force multiplied by the distance.

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According to the Oxford Dictionaries, one millimeter is a unit of measure for length that is equal to 0.039 inches. Therefore, 25 millimeters is equal to 25 x 0.039, which is equal to 0.975 inches.