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On Sunday, Jan. 26, the cost to mail a first-class single-piece letter jumped from 46 cents to 49 cents. The U.S. Post Office's 3-cent increase is the largest hike for consumer postage in more than a decade. The cost of mailing a postcard will also go up to 34 cents, a 1-cent increase.
How Many Ounces Can a Letter Weigh Before There's a Need to Add Another Stamp? The cost of a first-class stamp is $0.49, according to the United States Postal Service website as of November 2017. One needs a single stamp to mail a letter that weighs one ounce or less. Each additional ounce carries with it a cost of $0.21. This is the cost for mailing when stamps are purchased at the post office. There can be other additional charges as well, depending on the shape and size of the letter. Cost of Postage Through Metered Mail There is a slight discount for metered mail. The cost to mail a one-ounce letter through metered mail is $0.46, with a charge of $0.21 per additional ounce. Metered mail is mail that is sent by businesses, and it includes self-addressed stamped envelopes.