Question: how many stamps do i need on an 8.5 x 11 envelope?
Answer: Minimum postage on a 8 1/2 x 11 or 8 1/2 x 14 envelope is $1.00 or 2 forever stamps. That covers the first ounce of weight. Each additional ounce is 22 cents. You can now buy additional-postage forever stamps.