M-weight refers to the weight of 1,000 sheets of paper. Use this online calculator to easily measure m-weight by providing the sheet size, basis weight, and basic size of the paper (see the example below). When filling in these fields, use decimal fractions where necessary; and give all lengths in inches and weight in pounds.
| M-Weight Calculator |
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Disclaimer
The numerical results from this calculator are estimates only and are not guaranteed. Be aware that individual mills may use slightly different methods of calculating m-weight. Also, certain products — particularly higher-caliper SBS and Recycled Board — can vary dramatically in basis weight (and therefore m-weight). Lastly, actual selling m-weight may be calculated on the full width of the roll (i.e., your size plus waste), thereby increasing the m-weight amount. Please call your sales representative to confirm m-weight.
Example
Find the m-weight for a sheet of 11″ × 17″ Book paper with a basis weight of 70 lbs.
Formula:
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(Area of Given Sheet) × Basis Weight Area of Basic Size |
= | Rounded Ream Weight × 2 | = | M-weight |
Equation:
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(11 × 17) × 70 (25 × 38) |
= | 13.78 × 2 | = | 27.56 |
Note that in this example, the area of the given sheet size is 11 × 17 = 187 inches2, or less than 336 inches2; which means, according to the m-weight rounding rules (see below), that the ream weight should be rounded to the nearest hundredth of a pound.
Specifications
| Rounding Rules | |
|---|---|
| Sheet Size | Ream Weights |
| 864 inches2 or larger | Ream Weight calculated to nearest pound, e.g.: 148 lbs. |
| 336 inches2 to 864 inches2 | Ream Weight calculated to nearest half pound, e.g.: 148.5 lbs. |
| Less than 336 inches2 | Ream Weight calculated to nearest one hundredth of a pound, e.g.: 148.57 lbs. |
Terms & Definitions
Ream: 500 sheets of paper cut to a given standard size for a particular grade.
Ream Weight: The weight of 500 sheets of paper.
M-weight: The weight of 1,000 sheets of paper (or two reams).
Basis Weight: The weight of a ream, measured in pounds. (See supplemental tables below.)
Basic Size: The standard sheet size from which the basis weight of a given grade of paper is determined.
Supplemental Tables of Approximate Basis Weights
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See Also…
