The number of stamps required for a 2.0 oz envelope depends on the mailing service you're using and the type of stamps you have. In the U.S., a standard first-class stamp covers the first ounce, and additional ounces typically require extra postage. As of now, you would generally need one first-class stamp for the first ounce and an additional stamp or two for the extra ounce, so you might need a total of 2-3 stamps. It's best to check with your local postal service for the latest rates and requirements.
how many stamps for a 3.4oz envelope
The amount of stamps needed for an envelope is determined by weight. Weigh your a4 envelope and you will know how much postage is needed.
That depends what denomination of stamps you place on the envelope.
As many as will fit. I have one envelope in my collection with 44 stamps on it! The sender used one cent stamps to mail it. Some people will overlap stamps to get more to fit, which is okay as long as the Post Office can plainly see that they are all there.
It depends on tne weight of the envelope not the size.
2
4
I think you mean 9x12 envelope.
A 4-ounce large envelope currently costs $1.57.
It depends on how heavy the contents are and how big the envelope is.
I successfully mail CDs all the time with 2 stamps.
5 as of January 18, 2013.