how many stamps do i need for a 10 oz envelope
Depends on the weight. A 10 X 13 envelope (must be less than 1/4 inch thick) is considered a flat and costs 80 cents for the first ounce and 17 cents for each fractional ounce after that up to 13 ounces.ell, 5 pieces of paper weigh 1 ounce which would be one stamp, so 10 would be two stamps, but you might want to use 3 because of the weight of the envelope. Or just go to the PO and have them weigh it.