Postage Rates 2024 Per Ounce Letter. Usps ® rates are determined based on a combination of weight, mail class, and shape. Learn about the 2024 postage price change for usps services and products, and how it affects domestic and international mail.

Changes by usps for postcards, flats & letter size. Letters or postcards around the world with one global forever ® stamp, which currently costs $1.65 and never expires, even if the postage price goes up.