How to Calculate Paper Grams to Pounds

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There are formulas that will allow you to convert paper grams to the pounds in a ream.
There are formulas that will allow you to convert paper grams to the pounds in a ream. (Image: Jupiterimages/BananaStock/Getty Images)

To ensure quality when paper is used in multiple countries or ordered from abroad, it may be necessary to convert the metric paper weight equivalent to the U.S. standard for comparison. In countries that use the metric system, the weight of paper is expressed in grams for the weight of one sheet. In the United States, this is expressed in the number of pounds in a ream of 500 sheets. Using a conversion formula, these values can be easily transferred.

Divide the gram weight of one sheet of paper by the number 453.6. This is how many pounds one square meter of paper weighs. You would use this number because 1 lb. equals 453.6 g.

Take the result and divide it by the number 1,550. This is how many pounds one square inch of paper weighs. You would use this number because there are 1,550 square inches in a meter. Record this number.

Find the type of paper you have on the following chart:

Bond: 17 inches x 22 inches = 374 square inches Newsprint: 24 inches x 36 inches = 864 square inches Book: 25 inches x 38 inches = 950 square inches Cover: 20 inches x 26 inches = 520 square inches Bristol: 22.5 inches x 28.5 inches = 686 square inches Index: 25.5 inches x 30.5 inches = 778 square inches Tag: 24 inches X 36 inches = 864 square inches

Take the number of square inches in your type of paper listed in this chart and multiply that number by the weight per square inch that you determined in Step 2. This is the weight in pounds of a single piece of paper.

Multiply by the number 500. The U.S. system of paper weight measures by the ream, which is 500 sheets of paper.

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