Going to where? If you mean domestically within the US, then the US Postal Service rate would be $1.90 ... see the Related Links below for more info.
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For an envelope that weighs 5 ounces, you would need 5 Forever stamps. Forever stamps are typically for 1-ounce letters, so you would need to use multiple stamps to cover the additional weight.
That rather depends on your country and whether by surface, air, or fast mail. The answers will be available from your postal system, and their website.
As of June 10, one ounce of first class mail is 44¢. Every additional ounce is 20¢. So, a six ounce envelope would cost $1.44 to mail, or four forever stamps.
how many stamps for a 3.4oz envelope
As of 2016, a 2.5 ounce envelope it would cost 93 cents (one Forever stamp plus two extra ounces).
In a standard size envelope, as of June 2009, you need 75 cents in stamps to mail an envelope up to 1 ounce to Canada. You could use two 44 cent stamps (you would be paying too much) or you can buy 75 cents of stamps at a post office. You need an additional 25 cents worth of stamps for each additional ounce or fraction of an ounce. Letters over 3.5 ounces have different rates.
For a 2.2 oz envelope, you would typically need two Forever stamps. The first stamp covers the standard letter rate for up to 1 ounce, and the second stamp covers the additional weight up to 2 ounces. Since the 2.2 oz envelope exceeds the 2-ounce limit, an additional ounce rate applies, which requires a total of two stamps. Always check the current USPS rates to confirm, as they can change.
For a regular sized envelope up to 3.5 ounces, it is 98 cents for the first ounce and 84 cents for each additional ounce or fraction of an ounce.
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.
It depends on tne weight of the envelope not the size.
I think you mean 9x12 envelope.