Postage depends on the size and weight of the letter you are sending. USPS first-class mail stamps start at forty four cents for letters under two ounces.
The postage for a 6 x 9 envelope would depend on the weight of it.
The postage for a 6 x 9 envelope would depend on the weight of it.
Two stamps
The answer will depend on where you are posting it to!
One
A 6 x 9 envelope for a 1099 will cost you approximately $1.40. The exact amount will depend upon the weight of the package.
The cost of postage to mail 6 pages depends on the weight and size of the envelope used. For a standard letter-sized envelope weighing under 1 ounce, the postage is typically the same as for a single page, usually around $0.63 for first-class mail in the U.S. If the envelope is larger or heavier, additional postage may be required. It's best to check with your local postal service for specific rates.
An envelope with a height exceeding 6 and one-eighths inches, and any square envelope, is non-machinable. Therefore, the rate for first class US domestic postage is $.64.
Square EnvelopesSquare envelopes are subject to the $0.20 nonmachinable surcharge.As of May 11, 2009 a regular first class stamp is $0.44 so postage for a square envelope is $0.64Technically, the 6 1/4 x 6 1/4 size classifies the letter as a "Large Envelope" (smallest dimension > 6 1/8 inches), but since it is so close (1/8" !!) they may not enforce the higher Large Envelope rate.See the post office website for more information: http://pe.usps.com/text/dmm100/postage.htm
If it is not thicker than 1/4" and doesnt weight more than an ounce it is .44 cents.
A 6x8 inch padded envelope will require approximately $3.00 for up to 13 ounces. The USPS website offers the tools for all calculations based on weight and envelope dimensions
As of August 2012, first class US postage for a 6x9 3.5oz domestic letter is $1.05.