Q:

How many ounces can a letter weigh before you need to add another stamp?

A:

Quick Answer

Standard-sized letters up to 1 ounce can be mailed with a single first-class stamp. Above that, additional postage is required. Starting in January 2014, the first ounce of mail requires 49 cents postage and additional ounces are 21 cents.

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Full Answer

Unusually shaped envelopes, those that do not bend easily, have clasps instead of adhesive or are lumpy, are charged a nonmachinable surcharge of 21 cents, according to the postage calculator on the USPS website. Oversized envelopes, more than 11.5 inches x 6.125 inches or more than 0.25 inches thick, are also subject to higher postal rates regardless of the weight. The 2014 rate for large envelopes is 98 cents.

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