Converting paper weight from pounds to gsm
Table
Paper Grades | Basic Size (inches) |
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Cover | 20 x 26 |
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Index | 25.5 x 30.5 |
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Tag | 24 x 36 |
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Bristol / Tag | 22.5 x 28.5 |
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NOTE: Tag appears in the table twice because two basic sizes are commonly used.
Formula for converting paper weights
If you know the paper grade, you can use the following formula and the values in Table
Formula (weight in pounds) x (multiplier from table) = (weight in gsm)
Table A-2. Multipliers for converting pounds to gsm
Stock type | Multiplier |
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Bond / Xerographic / Ledger / Writing | 3.76 |
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Offset / Book / Text | 1.48 |
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Cover | 2.70 |
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Index | 1.81 |
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Tag (24 x 36) | 1.63 |
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Bristol and Tag (22.5 x 28.5) | 2.19 |
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Examples The weight of 90 pound offset paper is approximately 133 gsm. 90 x 1.4802 = 133.218
The weight of 100 pound cover is approximately 270 gsm. 100 x 2.7042 = 270.42
Table for converting paper weights
You can also use Table
1.Locate the paper type at the top of the table.
2.Move down the paper type column and locate the basis weight.
3.Follow the basis weight row to the left to find the approximate gsm weight.
Xerox Nuvera Paper Guide |