Calculating Postage: A Guide From
How Many Stamps Do I Need Per Oz in 2022? For letters weighing 1 oz or less, the USPS requires one Forever Stamp. However, if your letter weighs more than 1 oz but less than 2 oz, you will need to get an extra $0.20 stamp. If your letter weighs more than 2 oz but less than 3 oz, you will need to get a different “fractional postage” stamp ($0.40 stamp) alongside a Forever Stamp....