Take your envelope to the Post Office and they will weight it, and give you your answer as the cost of mailing anything is done by weight.
To mail a 9x12 envelope weighing 3.8 ounces, you typically need two First-Class stamps, as the first ounce costs one stamp and each additional ounce costs an extra stamp. Since the envelope weighs 3.8 ounces, it falls into the 3-ounce rate category, which requires two stamps. Check with your local postal service for any changes in rates or requirements.
The first ounce will cost 44 cents. Each additional ounce, or fraction, is another 17 ounces. That would be 78 cents for that envelope at the start of 2011.
I think you mean 9x12 envelope.
A 4-ounce large envelope currently costs $1.57.
To mail an envelope weighing 3.2 ounces, you would typically need two first-class stamps, as one stamp covers up to 1 ounce, and additional ounces require extra postage. The current rate for additional ounces is around 20-24 cents per ounce, depending on postal regulations. It's always best to check with your local postal service for the most accurate and up-to-date rates.
To mail an envelope weighing 1.5 ounces in the United States, you typically need two first-class stamps. The first stamp covers the base rate for up to 1 ounce, and the second stamp accounts for the additional weight. Always check the current postal rates, as they can change.
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.
That depends on where you are sending it from (you country of origin) and to (the country of destination).
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.
how many stamps for a 10.4 ounce envelope
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).