Postage Rates 2024 By Weight Calculator. Services that are eligible for additional savings off of commercial rates with a shippingeasy subscription. Explore the usps postage rate shifts for postcards, flats, and letter sizes in 2024, and optimize your mailing strategies.

For large envelopes (flats) up to 15.994 oz., postage. You can get postal charges from china to other countries, air post prices,.