1
To determine the ream weight of any given size sheet, multiply the square inches in the given size by the given basis weight; divide the result by the square inch area of the basic size.
Formula:
Example:
Find the ream weight of a sheet of 43 x 61, basis 60 lb. Offset paper.
Note: 25 x 38 is the basic size of offset paper
To determine the pages per inch (PPI), divide 2 by the caliper of the given sheet.
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
The ream weight is the weight of 500 sheets; the M weight is the weight of 1,000 sheets. The M weight can be obtained by first finding the ream weight, rounding it by the rounding rules, then multiplying by 2.
ROUNDING RULES
Sheet size
864 inches 2 or larger
Ream weight
Ream Weight calculated to nearest pound. (166 lbs)
©
May 200

2
336 inches 2 inches 2
to 864
Less than 336 inches 2
Ream Weight calculated to nearest half pound. (166.5 lbs)
Ream Weight calculated to nearest one hundredth of a pound. (166.55 lbs)
Formula:
BASIC SIZES
Bond
Book & Offset
Tag
Index
Vellum Bristol
Coated Cover 1S/C2S
Coated Cover C2S
C1S Label
Opaque Cover
17 x 22 = 374 square inches
25 x 38 = 950 square inches
24 x 36 = 864 square inches
25.5 x 30.5 = 778 square inches
22.5 x 28.5 = 641 square inches
24 x 36 = 864 square inches
20 x 26 = 520 square inches
25 x 38 = 950 square inches
20 x 26 = 520 square inches
Example:
Find the M Weight of a sheet of 43 x 61, basis 60 lb. Offset paper.
To determine the weight of an odd number of sheets, multiply the M Weight by the number of sheets; divide the result by 1,000.
Formula:
Example:
Find the weight of 1,365 sheets, 25 x 38, 60 lb. 120M Offset paper.
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May 200

3
To find the approximate weight of a roll, multiply roll diameter squared minus core diameter squared by roll width and appropriate factor.
FACTOR CHART
Antique .018
Vellum Offset
Bond
Smooth Offset
Vellum Bristol-Cover
Tag and Index
C1S
C2S Cover
C1S Cover & Blanks
.020
.021
.022
.022
.026
.030
.033
.030
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.
NOTE: The results of the Interactive Calculations System are estimates and are not guaranteed by International Paper.
To determine the density of any given sheet, divide the basis weight by the caliper.
Formula:
Example:
Find the density of a sheet of 118 lb. Carolina C2S Cover paper with caliper of .008
Note: Caliper is expressed in the formula as a whole number.
©
May 200

To find the approximate linear footage in a roll of paper, multiply the weight of the roll by the square inches of basic size by 500. Divide by the sum representing the width of the roll, multiplied by the substance or basis weight, times 12.
ROUNDING RULES
Sheet Size
864 inches 2 or larger
336 inches inches 2
2 to 864
Less than 336 inches 2
Ream Weight
Calculated to nearest pound.
= 166 lbs
Calculated to nearest half pound.
= 166.5 lbs
Calculated to nearest one hundredth of a pound.
= 166.55 lbs
BASIC SIZES
Bond
Book & Offset
Tag
Index
Vellum Bristol
Coated Cover 1S/C2S
Coated Cover C2S
C1S Label
Opaque Cover
17 x 22 = 374 square inches
25 x 38 = 950 square inches
24 x 36 = 864 square inches
25.5 x 30.5 = 778 square inches
22.5 x 30.5 = 686 square inches
24 x 36 = 864 square inches
20 x 26 = 520 square inches
25 x 38 = 950 square inches
20 x 26 = 520 square inches
Formula:
Example:
Find the footage of a roll of basis 50 lb. Offset paper, 26" wide and weighing 100 lbs.
Note: Caliper is expressed in the formula as a whole number.
4
©
May 200