| Since paper is routinely sold by the pound, it is useful to understand how the weight of paper is expressed. Each grade of paper is available in certain Basis Weights. Offset Paper, for example, is available in Basis Weights of 40, 50, 60, 70, 80 and 100 lb. The Basis Weight is defined as the number of pounds that 500 sheets of a certain size weighs. That "certain size" is different for each grade of paper and is known as the Basis Size.
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The following chart shows the Basis Sizes for common Grades:
| Offset & Book |
25 x 38 |
| Tag or SBS |
24 x 36 |
| Cover |
20 x 26 |
| Index |
25 1/2 x 30 1/2 |
| Vellum Bristol |
22 1/2 x 28 1/2 |
| Office & Writing |
17 x 22 |
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