Question: how many stamps do i need for a letter that weighs 1.5 ounces?
Answer: A letter weighing 1 ounce will need one first-class stamp. As of January 2019 a first-class stamp costs $0.55, every additional ounce is charged at $0.15. So if you are sending a 2-ounce letter you will need $0.70 worth of postage stamps.