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