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How heavy can a letter be for a first class stamp?

A letter can weigh up to 1 ounce and still be eligible for a first-class stamp from the United States Postal Service (USPS). The USPS defines a letter as a piece of mail that is rectangular in shape, has one dimension that is at least 6-1/8 inches long and at least 3-1/2 inches high, and is no more than 11-1/2 inches long and 6-1/8 inches high. A letter must also be flexible and not contain any items that are not permitted in the mail, such as hazardous materials or live animals.

If a letter weighs more than 1 ounce, you will need to pay an additional fee for each additional ounce. As of January 2021, the price of a first-class stamp for a letter that weighs 1 ounce is $0.55. For each additional ounce, you will need to pay an additional $0.20, for a total of $0.75 for a 2-ounce letter, $0.95 for a 3-ounce letter, and so on.

It’s important to note that the USPS also offers other shipping options for larger or heavier items that do not meet the requirements for a letter. These options may include flat-rate envelopes, padded envelopes, or packages. You can check the USPS website or contact your local post office for more information about these options and the fees associated with them.

By: Parcel Path Editorial Team

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