FORMULA: | Sq. Inches Area of Paper Size x Sub. or Basis Weight | = Ream Weight |
Sq. Inches Area of Base Size |
For Writing Papers and Index sheet sizes smaller than 336 sq. inches- compute ream weight to 2 decimal places (disregard all numbers after the second decimal place). Sheet sizes 336 sq. inches and over compute ream weight to nearest one half pound. Double to obtain M sheet weight.
For Opaque Circular, Book Papers, Text and Cover, sheet sizes 187 sq. inches or less - compute ream weight to 2 decimal places (disregard all numbers after second decimal place). Sheet sizes over 187 sq. inches to 864 sq. inches - compute ream weight to nearest one half pound. Sheet sizes 864 sq. inches compute ream weight to nearest full pound. Double to obtain M sheet weight.
Base Size | Square Inches | Weight Figured To Two Decimal Places | Weight Figured To Nearest One-Half Pound | Weight Figured To Nearest Full Pound |
Writing Papers | 17 x 22 | 374 | Less than 336 sq. in. | 336 sq. in. and over | - |
Index | 25 1/2 x 30 1/2 | 777.75 | Less than 336 sq. in. | 336 sq. in. and over | - |
Opaque Circular | 25 x 38 | 950 | 187 sq. in or less | Over 187 sq. in. to 864 sq. in. | 864 sq. in. and over |
Book Papers | 25 x 38 | 950 | 187 sq. in or less | Over 187 sq. in. to 864 sq. in. | 864 sq. in. and over |
Text Papers | 25 x 38 | 950 | 187 sq. in or less | Over 187 sq. in. to 864 sq. in. | 864 sq. in. and over |
Cover Papers | 20 x 26 | 520 | 187 sq. in or less | Over 187 sq. in. to 864 sq. in. | 864 sq. in. and over |
Bristol | 22 1/2 x 28 1/2 | 641.25 | Less than 336 sq. in. | 336 sq. in and over | - |
Fractional weights between:
.0 to .24 - to nearest half pound (20.24 lbs. becomes 20 lbs.)
.25 to .74 - to nearest half pound (20.62 lbs. becomes 20 1/2 lbs.)
.75 to .99 - to nearest half pound (20.85 lbs. becomes 21 lbs.)
When figuring to two decimal places, drop all fractions more than two places.
(Example - 10.378, not 10.38). First, figure ream weights, rounding off properly, then double for M weights.