Calculations & Conversions

How to Determine Ream Weights

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.

Online Calculation
Given Size (height):
Given Size (width):
Basis Weight:
Basic Size (height X width): X

Ream Weight: lbs. per ream

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 28.5 = 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
FORMULA: (Given Sheet Size x Basis Weight) / Area of Basic Size = Ream Weight

Example

Find the ream weight of a sheet of 43 x 61, basis 60 lb. Offset paper.

EXAMPLE: (43 x 61 x 60) / (25 x 38) = 166 lbs. per ream
Note: 25 x 38 is the basic size of offset paper
© 2008 International Paper Company. All rights reserved.