Rounding Rules 





Sheet Size 
Ream Weight 





864 inches2 or larger 
Ream Weight calculated to nearest pound. 





(166 lbs.) 





336 inches2 to 864 inches2 
Ream Weight calculated to nearest half pound. 





(166.5 lbs.) 





Less than 336 inches2 
Ream Weight calculated to nearest one hundredth of a pound. (166.55 lbs.) 

















Basic Sizes 






Bond 
17 x 22 = 374 square inches 





Book & Offset 
25 x 38 = 950 square inches 





Tag 
24 x 36 = 864 square inches 





Index 
25.5 x 30.5 = 778 square inches 





Vellum Bristol 
22.5 x 30.5 = 686 square inches 





Coated Cover 1S/C2S 
24 x 36 = 864 square inches 





Coated Cover C2S 
20 x 26 = 520 square inches 





C1S Label 
25 x 38 = 950 square inches 





Opaque Cover 
20 x 26 = 520 square inches 











Formula 














(Basis Weight x 1406.5) / Basic Size





























Example 





Convert 17 x 22, 28 lb. Bond/Writing paper to grams per square meter. 














(28 x 1406.5) / 374






Formula 





















Example 





Find the M Weight of a sheet of 43 x 61, basis 60 lb. Offset paper. 






























Formula 





















Example 





Find the footage of a roll of basis 50 lb. Offset paper, 26" wide and weighing 100 lbs. 






























Formula 





















Example 





Find the weight of a roll of forms bond paper with a roll diameter of 40 inches, a core diameter of 3 inches, and a roll width of 17.5 inches. 





Note: .021 is the appropriate factor for forms bond paper. 





















Formula 






















Example 





Find the pages per inch for Coated Cover Paper with a caliper of .010. 





Note: 25 x 38 is the basic size of offset paper
























