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