The answer will depend on where you are posting it to!
One
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.
The number of sheets of paper that can fit in a 6 inch by 9 inch envelope depends on the thickness of the paper. Standard printer paper is about 0.1 mm thick. If we assume a typical thickness, you could fit approximately 20 to 30 sheets comfortably, but this can vary based on the type of paper and how tightly you pack the envelope.
In the United States to a destination within the United States as of December 2009, it would be 44 cents plus a 20 cent non-standard surcharge plus 17 cents for each ounce or fraction of an ounce over one ounce, up to 3.5 ounces. HIgher rates apply if the envelope is more than 1/4 inch thick or weighs over 3.5 ounces. So if the envelope is one ounce or less, the charge would be 64 cents. Hint: you can save the 20 cent surcharge by putting your envelope inside a standard rectangular-shaped envelope. Note: This answer was correct when it was written. Postage prices change almost every year.
The answer will depend on where you are posting from, where you are posting to and whether or not there are any special requirements.
One
The cost for postage on the 9x11-inch envelope will vary depending on the weight. As of May 2014, the standard cost of a stamp is 49 cents in the United States.
How much postage is required for a 6x8 inch card? It weighs less than 1 ounce.
thirty-two cents
Go to the site below and click on the "Calculate Postage" tab.
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
Depends all on the weight.
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.
1st class letter price which is 46 cents as of Oct 2013
As of August 2012, first class US postage for a 6x9 3.5oz domestic letter is $1.05.
area of envelope = l Xb =8.5 X11 =93.5 inch^2
As of January 22, 2012, US Postage is 45 cents. That is valid for an one ounce machinable letter, mailed in a letter-sized envelope and no thicker than one-quarter inch. It also must not contain any rigid, such as cardboard, keys or pens.