Cardstock Weights and Metric Equivalents
Metric Equivalent
(g/m2)
Basis Weight
(pounds per ream of 500 sheets, sized as shown)
Bond

17" x 22"
431.8 x
558.8mm
Offset

25" x 38"
635.0 x
965.2mm
Cover

20" x 26"
508.0 x
660.4mm
Printing
Bristol
22.5" x 35"
571.5 x
889.0mm
Index
Bristol
25.5" x 30.5"
647.7 x
774.7mm
Tag

24" x 36"
609.6 x
914.4mm
752050---50
902460----
1052870----
10829-40---
1183180----
12032---6774
1313590----
13536-50---
14839100----
16343-60-90100
1764712065---
19953--110110-
20354----125
Note: Card stock weights may vary 5%
Source:  Lexmark Card Stock & Label Guide: Laser Printers.  Lexmark International, Inc., September 1999