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Weight, Size, & Shape Requirements. 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.
Size Requirements for Machinable First-Class Mail Letters: Minimum Size: 3½ inches by 5 inches. Maximum Size: 6⅛ inches by 11½ inches. Thickness: 0.007 inch to ¼ inch. First-Class Mail Metered Mail A price category for First-Class Mail letters that applies when metered postage (such as PC Postage) is affixed.
Weight and Shape/Size. What unit of measurement are you using? Standard Metric. What is the weight of your mail piece? Pounds. Ounces. Kilograms. Please select from the following options.
The maximum weight for First-Class Mail packages is 13 ounces. A package exceeding 13 ounces is classified as a Priority Mail item. The decrease in price to $0.17 for each additional ounce for all mail shapes results in lower prices for letters weighing over 1 ounce and for large envelopes weighing over 6 ounces.
International Packages except First-Class Package International Service. Girth is the measurement around the thickest part of the parcel. Maximum length + height + thickness combined = 36 inches. Minimum length + twice the diameter combined = 12 inches.
First-Class Mail Minimum Weight: none; Maximum Weight: Maximum Weight: 13 ounces (over 13 ounces, First-Class Mail becomes Priority Mail). Letter Maximum Weight: 3.5 ounces. Minimum Quantity to Mail at Commercial Prices: 500 pieces.
Maximum weight: First-Class Mail and Periodicals nonmachinable letters 3.5 ounces; USPS Marketing Mail nonmachinable letters; less than 16 ounces. Presorted First-Class Mail letters are subject to a nonmachinable surcharge if they meet any of the characteristics in 201.2.1 .
TIP: As a rule of thumb, you can send 1 oz (4 sheets of printer paper and a business-sized envelope) for 1 First-Class Mail ® Forever ® stamp (currently $0.73). The postage for a large envelope (or flat) starts at $1.50 for 1 oz.
Weight, Size, & Shape Requirements. Send mailpieces up to 15.994 oz. All postcards, letters, and large envelopes (or flats) must be rectangular, otherwise an additional charge may apply. Additional size restrictions apply depending on the type of mailpiece you're sending.
First-Class Mail ® is an affordable mail service for standard-sized, single-piece envelopes weighing up to 3.5 oz and large envelopes weighing up to 13 oz. Prices start at $0.73 at a Post Office. Buy Stamps for First-Class Mail.