How many stamps do I need for 4 oz?
4 x Domestic Forever Stamps, 1 x 5 cents stamp, plus 1 x 15 cents Additional Ounce stamp.
How many stamps do you need per ounce?
Solved. Short Answer: One $0.55 First-Class Mail stamp covers one ounce. However, you do not need one stamp per ounce. First-Class Mail prices anything above one ounce at an additional $0.15 per ounce ($0.70 for two ounces, $0.85 for three ounces, etc.), and you can purchase Additional Ounce stamps for $0.15 each.
