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Depends all on the weight.
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
One Forever stamp, or 47 cents.
Different countries have different postage rates and, in order to give a sensible answer to your question, it might have been just a tiny bit helpful to know which country you were posting from! Without that information there cannot be any sensible answer.
area of envelope = l Xb =8.5 X11 =93.5 inch^2
I just weighed my letter size envelope with 12 standard pieces of paper folded inside and it was 2 ounces. According to USPS.com, the cost is $.64. I am using 2 forever stamps to get the letter on its way. If you can't fold the paper like a normal letter, go to USPS.com where they provide a convenient postage price calculater.
One
Yes, it can be used to make up the total cost if there is an actual value on it. If it is a Forever Stamp, or one that contains only a letter and no value, it cannot be used on international mail.
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.
See page #12 of: http://www.southernct.edu/finadm/uploads/textWidget/wysiwyg/documents/USPS_New_Rates.pdf Not only does it let you know how many pages of mail you can mail for one stamp, it breaks it down by the type of envelope you use. As of 03/2009 it is 1-5 sheets of 20 pound copy paper in a #10 envelope or 1 ounce 1-4 sheets of 20 pound copy paper in a 6x9 envelope or 1 ounce Total envelope must be less than 1/4 inch thick. If you don't want to buy exact postage you can us 2 stamps for up to 3 ounces with the envelope less than 1/4 inch thick. In a #10 envelope that is 17 sheets of 20 pound copy paper In a 6x9 envelope that is 16 sheets of 20 pound copy paper Keep in mind the number of sheets is approximate and paper weight will make a difference!
No, the minimum size for an envelope by USPS standards is 3.5 inches wide by 5 inches high.
thirty-two cents