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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.
A First Class letter can only weigh up to 3.5 ounces per mail piece. If you need to send papers or documentation that weighs more than 3.5 ounces, a good strategy is to break up your mail into separate, multiple envelopes with their own stamps. Or, you could always ship it all together using a single Priority Mail Flat Rate Envelope!
A First-Class Mail ® Forever stamp costs $0.73 and goes in the upper right corner of the envelope. (You can also use any combination of stamps that adds up to $0.73.) If your letter is heavier or bigger, or if you want to add insurance or extra services like Certified Mail ® service, you'll pay more. A standard postcard stamp costs $0.56 ...
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.
USPS postage rates offer low-cost mailing and shipping prices for domestic & international customers. See Forever postage stamp prices and other postage rates.
Estimated delivery time is one (1) to five (5) days (not including Sundays and postal holidays) for First-Class Mail, and begins on the date postmarked. In some instances, such as a short distance between the sender's and recipient's ZIP Codes™, delivery can possibly occur in one day.
When a piece of First-Class Mail exceeds any one of the maximum measurements of a letter, it is classified and priced as a large envelope (flat). The maximum weight for letter-size pieces is 3.5 ounces.