If so, then it is a Flat/Large Envelope. Make sure you know whether your mail piece is a postcard, letter, a flat, or a parcel. Find standard envelope sizes, name and dimensions -- Assistance to help choose the correct envelope for your project - Envelopes have many sizes and may cause confusion. 1 decade ago. Envelope size chart. First-class letter is the least expensive, and large envelope/flat is in the middle. 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). First Class pieces are categorized as letters, flats (AKA Large envelope), or packages/parcels (which includes any piece over 3/4 inch thick). The maximum size for letters did not change: 11-1/2" x 6-1/8" x 1/4" thick. If you’re sending books in large envelopes, they are considered parcels. Domestic Quick Reference Guide and Flat Rates for Domestic; Quick Reference for International Prices and International Flats. Want an in-depth look at popular envelope products? The difference in the postage is significance depending. Lv 7. In any case, if it is greater than 3/4" at any point, it is a Parcel. Thick and not bendable. Relevance? I'm talking about very small contents and almost flat. A #10 envelope is the popular business envelope size, and is used for both direct mail and transactional mail. Favorite Answer. That is determined by the size of the piece, not by what it contains. I agree with the 6X9 envelope. 3 Answers. Envelope Help is here. I can't really call these "rigid" which seems to be a USPS term as part of the qualifications. It is small enough to still qualify as a “letter”. Yes, a flat is a large envelope. Is a 6 x 9 envelope considered a letter envelope or a flat envelope? The USPS ® site contains the current physical standards and sizes for letters, parcels, and flats. The cost will be 44 cents as long as it is within the weight restrictions. There is no "Large package" category within First Class. USPS Postage Price Calculator is a free online tool that allows you: Calculate Postcard price; View Flat Rate Envelopes Hello When mailing it yourself from a machine, etc., do you treat a bubble or padded envelope as a package or as an envelope? If a bit larger, it would be a “flat” and would require more postage. Aspect ratio: Length divided by height: Ratio must be between 1.3 and 2.5 or the letter will be subject to a non-machinable surcharge. Standard US envelopes sizes are listed here. Answer Save. would it cost $0.44 or $0.88 to mail. Thanks If over 1/4", then it depends on if the package is uniform in thickness & flexible. First Class Letter. For example, a 9 x 12 envelope containing a letter is considered a "flat" because of its size, while a 5 x 8 card is considered a "letter", even though most of us would call it a postcard. If your goal is to send a package with a tracking number, your only option is to ship it by first-class parcel. But if a large envelope is thick or rigid, it is considered a parcel. If less than 1/4" thick, a 6x9 would still be classified as a Letter. The maximum weight for letter-size pieces is 3.5 ounces. Business envelopes are widely used for direct mail and transactional mail (e.g., monthly statements or bills). It’s only a flat if it’s “machinable” – i.e. able to bend and go thru the processing machinery like a letter. Business Envelopes for Direct and Transactional Mail Sizes. If over 1/4" and lumpy or rigid, then it is a Parcel. See step 3 for details. Minimum size: 3 1/2 inches tall x 5 inches long and 0.007 inches thick Maximum size: 6 1/8 inches tall x 11 1/2 inches long and 1/4 inches thick Maximum weight: 3.5 oz. Part of the piece, not by what it contains your goal is to send a package with tracking! 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