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At that size and weight, it would cost $2.20 (as of 2016).
It depends on tne weight of the envelope not the size.
Postage is by weight - not size where letters are concerned.
Postage is determined by weight and by size. An envelope with three pieces of normal paper can normally be sent with one first class postage stamp. Additional stamps may be required based on additional ounces and on the size of the envelope.
That depends on what it weighs and where it's going ... not so much on its size. (It could also be related to the denomination of the stamps.)
It is a combination of size and weight. The size will require an additional fee as it is classified as over-sized and doesn't get handled by machines. You will have to weight you envelope, which you can do at the post office.
The answer will depend onwhich country you are posting from,where you are posting toin many countries, the size of the envelop.
If you buy the stamps and never use them, that's to many, if you buy stamps you think you might need and never use, that's to many, if you buy stamps just to have and admire them, that's collecting and your in the wrong section of WikiAnswers, you belong in collectibles.
One 49-cent stamp should be all that is needed.
One First Class is adequate if it is a standard size envelope of one ounce or less.
In the UK, it is not only the weight, but also the size and thickness of the envelope or package, and the destination (UK or abroad). It is best take take the envelope to a post office to ensure the correct postage is used.
You can send up to five sheets of paper in a regular or business size envelope for one 42¢ stamp, to any state.