Standard Print Sizes:

Business Card Size: 3.5×2

Half-Letter: 5.5×8.5 (Books, fliers, etc.)

Letter: 8.5×11  A very standard size.  (Letters, Newsletters, Small Posters, Books, etc.)

Tabloid: 11×17 (Posters, Saddle Stitched Booklets (Stapled and folded), etc.)

Oversized Tabloid: 12×18 (Posters with bleed, or just larger posters.)


#9 Envelope: 3.875×7.5 (Frequently used for business reply mail envelopes.)

#10 Envelope: 4.125×9.5 (This is a standard business sized envelope.)

See this page for a more complete listing on envelope sizes.