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USPS postage rates offer low-cost mailing and shipping prices for domestic & international customers. See Forever postage stamp prices and other postage rates.
Length plus girth combined cannot exceed 108 inches. (USPS Ground Advantage® cannot exceed 130 inches.)
Maximum weight for First-Class Mail letters is 3.5 oz; for large First-Class Mail envelopes, the maximum weight is 13 oz. All postcards and envelopes (or flats) must be rectangular, otherwise an additional charge may apply.
Package Weight. The U.S. Postal Service™ recommends that you use a scale to determine the weight of your package. Scales can be easily purchased online at The Postal Store®. Please keep in mind that if the package weighs more than the weight you entered, it will require additional postage when it is mailed or delivered.
Determine how much postage or how many stamps you need for your letter or package based on size, weight, and destination.
Compare USPS mail services by starting retail prices, delivery speed, and more. Most services automatically include USPS Tracking ® (except First-Class Mail ® service), and you can add insurance and extra services .
Use USPS Priority Mail Flat Rate packaging and pay one price: Pay the same price for mailpieces weighing up to 70 lbs going anywhere in the U.S. Use our Priority Mail Flat Rate Envelopes or Boxes that come in standard sizes so you don't have to worry about measuring them.
Use the USPS Retail Postage Price Calculator to determine postage costs based on weight, shape, and size of mail pieces.
Postage prices start at $57.97 at a Post Office. Weight, Size, & Shape Requirements No minimum weight, but any M-Bag under 11 lbs will be charged at the 11 lb price.
Learn about USPS parcel size, weight, and fee standards.