Postage for 9 by 12 envelope

2. Remove the backing and place the sticker along the top edge of the envelope you are mailing, directly to the right of the return address area. Make sure to leave room on the top right portion of the envelope to apply correct postage. On a package, the sticker can be placed to the left of the address area. 3.

Postage Stamps. Mailroom Equipment. Postal Scales; Mail Sorters; Industrial Shipping Supplies. Industrial Tape; Shrink-Wrap; Inspection & Shipping Tags; ... Office Depot® Brand 9" x 12" Catalog Envelopes, Clean Seal, White, Pack Of 25 4.7 out of 5 stars, average rating value. Read 492 Reviews.Priority Mail® Forever Prepaid Flat Rate Envelope. Includes Customer's Return Address. 12-1/2" (L) x 9-1/2" (H) $9.85. Results Per Page: 1. 2. 3. Shop our selection of Priority Mail Shipping Supplies on the USPS.com Postal Store.Shop our selection of Shipping Supplies on the USPS.com Postal Store. Go to USPS.com Site Index. Skip to Main Content Skip All Utility Navigation. Current language: English English; Español; ... Priority Mail Express® Window Envelopes. Pack of 10. 5-7/8"(L) x 10"(W) $0.00 Results Per Page: Previous; 1; 2We would like to show you a description here but the site won’t allow us.Stamps alone aren’t going to cover your postage in a couple of situations, usually all pertaining to packages and parcels versus straight up envelopes and letters. Obviously, if you’re going to stuff a letter envelope with everything but printed paper the chances are pretty good you’re going to shoot past that 1.9 ounce, single stamp ...This stamped envelope features a graphic design of the flag that evokes a rich sense of history even as it presents a recognizable icon in a fresh, contemporary way. Kit Hinrichs created the artwork for this stamped envelope. Ethel Kessler served as art director. 1. Choose a Format.

Shop our selection of Shipping Supplies on the USPS.com Postal Store. Go to USPS.com Site Index. ... Priority Mail® Tyvek Envelopes. ... Priority Mail Express® Padded Flat Rate Envelopes. Pack of 10. 12-1/2"(L) x 9-1/2"(W) $0.00 Priority Mail Flat Rate® Small Envelopes. Pack of 10. 10"(L) x 6"(H) $0.00 Priority Mail Flat Rate® Envelope ...Additionally, the larger 9 x 12 size provides ample space for various documents and materials, eliminating the need for folding or cramming. Use Cases for 9 x 12 Open End Envelopes - Brown Kraft. These envelopes are perfect for a wide range of applications, including mailing legal documents, photographs, certificates, and marketing materials.A 9×12 (9 inches by 12 inches) envelope is categorized as a "large envelope," with postage at $1.26. This price is the equivalent of two Forever stamps at $0.63 each ($0.63 x 2 = $1.26). This postage covers the first ounce only. You will need more stamps for each extra ounce of the envelope's weight.The Priority Mail Express Legal Flat Rate® Envelope is perfect for mailing legal size documents to their destination. Please Note: This product ships in packs of 10. An order of 1 equals 10 envelopes. Each Priority Mail and Priority Mail Express shipment includes USPS Tracking® service. For more information, please visit the Shipping Page.Issue Date: 7/10/2022. This Priority Mail® Forever Prepaid Flat Rate Padded Envelope - PPEP14PE has a bubble lining perfect for shipping those smaller items that need a little extra padding. Price is per envelope; minimum order is five envelopes. For more information, please visit the Shipping Page. 1. Choose a format. Padded Envelope $10.60. 2.

DVD Box (Flat Rate pricing for international only) 7-9/16" x 5-7/16" x 5/8" – Inside. 8-3/4" x 5-9/16" x 7/8" – Outside. Note: Flat Rate prices are available when material is sent in a USPS - produced Flat Rate Envelope or Box. When sealing a Flat Rate Box or Flat Rate Envelope, the container flaps must be able to close within the normal folds.You can use a standard letter-size envelope (9.5 x 4 inches) for small items like jewelry or documents, or a larger envelope (12 x 9 inches) for bigger items like books or clothing. ... it has to fit in one of the USPS-provided envelopes, such as the Padded Flat Rate Envelope (12.5 x 9.5 inches) or the Small Flat Rate Envelope (10 x 6 inches).Just like U.S. letters, international letters must be rectangular and made of paper to qualify for letter prices. Letter envelopes for international mail can be 11-1/2" long x 6-1/8" high. (A standard No. 10 envelope is 9-1/2" long x 4-1/8" high.) You can fold what you put in your envelope, but it needs to stay flat—no more than 1/4" thick.The price for sending a small flat-rate box across Canada is $19.99. Medium flat-rate boxes measure 390 mm x 260 mm x 120 mm. The Canada Post postage rate for sending such a parcel is $24.99. Large flat-rate boxes fall under these dimensions- 400 mm x 300 mm x 190 mm. The cost jumps to $32.99 for sending them.In 2020, first-class/flat-rate mail costs $1.00 for the first ounce and 20 cents for each additional ounce. For Priority Mail service, costs range from $7.75 for a flat-rate envelope to $8.40 for a padded flat envelope. If the contents of the envelope are rigid and the envelope cannot be bent, it is classified as a package.UPDATE: We may be dead wrong about this. UPDATE: We may be dead wrong about this. Slate columnist Nathaniel Rich calls our previously-posted advice to save money buying U.S.… Reade...

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The term flat refers to large envelopes. The postage rate on a manila envelope is $1 of the same size as the one for 9" by 12" envelopes and legal size envelopes. The first ounce of gold is 16 cents and the second ounce is 0. Each additional ounce will cost an additional $20. How much postage do I need for a 2 oz letter?Most document creation programs ship to the user with paper sizes preset into the print function to allow for quick and efficient printing of your document in the size desired. Due...Shop Forever Stamps. USPS offers a wide range of Forever® stamps, including Betty Ford, Women's Soccer, and Garden Delights to fit your postage needs. Shop Now. Stamps $1.12 Non-Machineable.Rate Finder is a tool that helps you calculate the cost of sending mail, parcels or courier items within New Zealand or overseas. You can also compare different delivery options, track your items and print labels online. Rate Finder is your one-stop solution for all your shipping needs with NZ Post.A 1-pound large envelope can cost anywhere between $7.50 and $14.05 with Priority Mail and between $26.75 and $59.90 with Priority Mail Express at the retail rates. The same 1-pound envelope using commercial pricing could range from $7.02 to $11.40 for Priority Mail and $23.00 to $51.60 for Priority Mail Express.

The 9x12 Booklet (9 X 12) Business Reply Mail Envelope (500/box) is a great size for a BRM Envelope because it fits multiple letter size sheets without folding. Our BRM Envelope is printed on 28# white paper and is available in boxes of 500. When you want your customer to respond in the fastest most efficient manner use BRM envelopes from Easy ...Updated Video: This video describes how to print USPS postage directly on to an envelope using Stamps.com Software.The 9" x 12" clear flap seal envelope makes a popular bulk mailing sleeve or printed product enclosure for 8.5 x 11 papers. This bag features a 1.6 mil USPS approved barrier, an adhesive strip on the flap of the bag, and a crystal clear material to ensure your product is the center of attention. Also available in our premium and laminate ...USPS classifies a 9" x 12" envelope as a "flat." At this writing, the postage rate for flats is $1.00 for the first ounce, and $0.21 for each additional ounce. So the postage required for an 8-ounce flat is $2.47.Track a Package. Informed Delivery. Find USPS Locations. Buy Stamps. Schedule a Pickup. Calculate a Price. Look Up a ZIP Code ™. Hold Mail. Change My Address. Rent/Renew aYou’ll need to pay $0.20 per extra ounce. So, if you’re mailing a package that weighs 4.3 ounces, it’ll cost $1.80 — four First Class stamps. If you’re unsure about …Priority Mail Flat Rate® Envelope. Single or Pack of 10. 12-1/2"(L) x 9-1/2"(H) $0.00 Global: African Daisy Stamps. International $1.55. $15.50 Priority Mail Express® Box - 2. Pack of 10 or 25. 14-1/8"(L) x 12"(W) x 3-1/2"(H) $0.00 Priority Mail® DVD Box. Pack of 25. 8-3/4"(L) x 5-9/16"(W) x 7/8"(H) ...Common Box Dimensions: 8 in x 8 in x 8 in, 12 in x 9 in x 6 in, 13 in x 11 in x 2 in Size Samples: Shoebox or three-inch, three-ring binder. Dimensions: 651-1,050 cubic inches ... Priority Mail 1-3 business days: Declared Value: $100: $100: $50: Guaranteed--Shipping Rates: National Flat Rate: 3 Zones: National Flat Rate: FAQ.Priority Mail, including Priority Mail Flat Rate shipping products, has fast shipping times (1, 2, or 3 business days) with flexible prices. Get free flat rate boxes and print postage labels online. ... 12 1/2″ x 9 1/2″ Pre-addressed Envelopes. Small Flat Rate Envelope: Large Envelopes. minimum. maximum. 11-1/2 inch min. 15 inches. 6-1/8 inch min. 12 inches. Packages. Maximum length plus girth 108 inches (130 inches for USPS Ground Advantage)

Priority Mail® Flat Rate. Use this when you need to send small, heavy items that weigh up to 70 lbs. without breaking the bank. Items are delivered in 1 to 3 business days. PRODUCT. POST OFFICE. QUADIENT. SAVINGS. Flat Rate Envelope (12.5" x 9.5" or smaller) $9.65.

Please select from the following options. Calculate Postcard price. View Flat Rate Envelopes. View Flat Rate Boxes. Calculate price based on Shape and Size.Columbian 9 x 12 Security Envelopes, 100/Box, 9 x 12 Inches, Release & Seal Self Seal, SimplySafe Tamper Evident Pull Strip, White (COLO930) 4.7 out of 5 stars. 590. 3K+ bought in past month. $15.99 $ 15. 99 ($0.16 $0.16 /Count) Save more with Subscribe & Save. FREE delivery Tue, May 7 on $35 of items shipped by Amazon.Please select from the following options. Calculate Postcard price. View Flat Rate Envelopes. View Flat Rate Boxes. Calculate price based on Shape and Size.The 2022 postage rate for First-Class Mail flat or large envelopes start at $1.20. You can put a maximum weight of 13oz of content inside a 9×12-inch envelope. Multiply the additional ounces by $0.24 to get the total cost. Sometimes the distance affects the prices of certain types of mail.Mail in 1–5 Business Days. First-Class Mail ® service is an affordable and easy way to send envelopes and postcards. First-Class Mail Forever ® stamps cost $0.68 (the current 1 oz price) and will never expire, even if the First-Class ™ postage rate goes up. To send packages, see USPS Ground Advantage ™ service. Priority Mail® Forever Prepaid Flat Rate Padded Envelope. Includes Customer's Return Address. 12-1/2" (L) x 9-1/2" (H) $10.60. Shop our selection of Envelopes Shipping Supplies on the USPS.com Postal Store. The U.S. Postal Service® celebrates a favorite backyard bird with the issuance of the Forever #9 Barn Swallow Window Stamped Security Envelope with (PSA) pressure-sensitive adhesive. 1. Format: Pack of 5 $4.40. Expand all.Postage Stamps. Mailroom Equipment. Postal Scales; Mail Sorters; Industrial Shipping Supplies. Industrial Tape; Shrink-Wrap; Inspection & Shipping Tags; Hand Trucks & Dollies; ... Tyvek® Envelopes, 9" x 12", End Opening, First-Class White, Pack Of 100 4.6 out of 5 stars, average rating value. Read 11 Reviews.

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How Many Stamps Should I Put on a 9×12 Envelope that Weighs 4 oz? The United States Postal Service classifies a 9×12 envelope as a flat. The postage required for mailing a 1-ounce flat is $1.20 for the first ounce and $0.25 for each additional ounce. So, the total postage required to mail a 4-ounce envelope will be around $1.95.Ship Packages Easily from Home or Office. Pay: Buy USPS Ground Advantage ™, Priority Mail ®, or Priority Mail Express ® postage for your packages. Print: Print your labels (or see other options if you don't have a printer). Ship: Schedule free Package Pickup 1 online or drop off your packages. Save: With the new, enhanced Click-N-Ship ...If you qualify for cash assistance through the Food Stamps program, there are several ways to access the cash you need. You can either get cash back when you use your card at the r...Just like U.S. letters, international letters must be rectangular and made of paper to qualify for letter prices. Letter envelopes for international mail can be 11-1/2" long x 6-1/8" high. (A standard No. 10 envelope is 9-1/2" long x 4-1/8" high.) You can fold what you put in your envelope, but it needs to stay flat—no more than 1/4" thick.Envelopes up to 15" x 12", weights up to 4 lb, not lumpy, not totally inflexible. Weight increments are 1,2,3,4,5,6,7,8 oz then 12 oz, 16 oz, +4oz. ... Don't try to mail a small envelope that's over 3.5 oz. even if you pay for it -- it confuses some postal clerks. The small envelope will look like a letter, and "LETTER" service up to 64 oz was ... How Shape and Size Affect Prices. Different postage prices apply to postcards, letters , large envelopes (flats), and parcels . In general, the bigger your mailpiece, the more it will cost to mail. In First-Class Mail, postcards cost less than letters. Letter size mail costs less than flat-size mail. Please select from the following options. Calculate Postcard price. View Flat Rate Envelopes. View Flat Rate Boxes. Calculate price based on Shape and Size.Clear Plastic Full Page Blank Envelope Pouch for Packing List - Return Label, Documents Keeps Paper Safe While Shipping Size 9 1/2” x 12” by MT Products (50 Pieces) 741. $1749 ($0.35/Count) $16.62 with Subscribe & Save discount. FREE delivery Sat, Apr 20 on $35 of items shipped by Amazon. ….

For letter-size mail, the delivery address window must be parallel with the longest edge of the envelope. For flat-size mail, the address window may be parallel with any edge of the envelope. For Registered Mail, the opening on a window envelope must be covered as described in 503.2.3.5. 6.4 Reusable Mailpiece. A reusable mailpiece is an ...Place the mailing address in the center of the 9-inch by 12-inch envelope and the return address in the upper left corner, on the same side as the mailing address, to address your 9-inch by 12-inch envelope. Bring the 9-inch by 12-inch envelope to the post office to be weighed on a postal weight scale in order to determine the amount of postage ...Large envelopes, such as a 9 by 12 inch manila envelope, oversized cards and other large, lightweight mailers such as brochures, ship in a category of First-Class mail known as flats. The First-Class postage scale for flats as of Jan. 30, 2020, starts at $1.00 for a 1 ounce mailing and maxes out at $3.40 for 13 ounces, the top weight allowed ...A letter sent in a standard size envelope weighing 1 ounce or less will require $0.66 of postage or one forever stamp. Each additional ounce is an extra $0.24 in postage. So, a two-ounce letter will cost you $0.90 while a three-ounce one will cost $1.14. Instead of placing two forever stamps on a two-ounce letter, you can place a single first ...How much postage do you need to mail a 9 x 12 envelope from US to Canada? $0.88 for under an ounce, $1.05 for between one and two ounces. Add $0.17 for each additional ounce.We would like to show you a description here but the site won’t allow us.About this item. Color: White Open End Airmail Envelope. Size: 9 x 12 inches. Quantity: 25 Envelopes per Pack. Made of 20lb paper with a smooth finish and airmail design to add a little flair to your next letter or correspondence! These fun, colorful envelopes are perfect for making your mail stand out from the pile!Large Envelope Properties. Select the one that most represents your mail piece. None of the following. is Rigid - does not bend easily. is NOT Rectangular or Square. contains items that cause more than 1/4 inch variation in thickness.The price for sending a small flat-rate box across Canada is $19.99. Medium flat-rate boxes measure 390 mm x 260 mm x 120 mm. The Canada Post postage rate for sending such a parcel is $24.99. Large flat-rate boxes fall under these dimensions- 400 mm x 300 mm x 190 mm. The cost jumps to $32.99 for sending them.Buy 9" x 12" Envelopes at Staples and get Free next-Day shipping. No order minimum. Postage for 9 by 12 envelope, The Priority Mail Flat Rate® Legal Envelope - EP14L is perfect for getting those legal size documents to their destination quickly and at a low flat rate.. Please Note: This product is only available in packages of 10. An order of 1 equals 10 envelopes. Each Priority Mail and Priority Mail Express shipment includes USPS Tracking® service., Colorado Hairstreak Stamps $1.12, Sheet of 20 ... Any non-machineable envelope, like oddly shaped or vertical envelopes, as well as lumpy envelopes, rigid envelopes, or mail with clasps, ribbons, or buttons, may use this stamp. Colorado Hairstreak is available in sheets of twenty. The words "NON-MACHINEABLE SURCHARGE" on the stamp indicate its ..., Non-standard and oversize (0-500 g) Oversize or non-standard size envelopes and postcards will cost you more in postage. Maximum dimensions. 380 mm x 270 mm (15 inches x 10.6 inches) If your letter is larger than the maximum dimensions above you’ll need to use our parcel services. Check out our size and weight limits for letters and documents ..., Priority Mail Express (Zone 1, 1 lb.) $30.95 $26.75. Return Receipt – Retail. Priority Mail Express (FR Envelope) $30.45 $26.35 Restricted Delivery. $3.65. Other Package and Shipping Services Retail rate PB rate Mailing Extra services. Media Mail (single piece, up to 1 lb.) $4.13 $4.13. Certified MailTM., However, if you're mailing oversized, square, or non-standard envelopes, the cost increases to $0.88. Postage rates for large envelopes and small packages range ..., USPS postage rates offer low-cost mailing and shipping prices for domestic & international customers. See Forever postage stamp prices and other postage rates. ... Square, Oversized, or Unusual Envelopes From $1.12. Postcard Stamps. Standard-sized, ... Priority Mail Flat Rate ® Envelope. $9.85 at the Post Office., Retail Postage Price Calculator Letter Properties. Start. Weight and Shape/Size. Letter Properties., You can print and pay for your Priority Mail Express and Priority Mail postage labels online using Click-N-Ship. USPS Tracking is provided free for domestic Priority Mail. International labels with postage may be purchased online for Global Express Guaranteed, Priority Mail Express International, Priority Mail International, and First-Class ... , Find out the types and benefits of Priority Mail Flat Rate® Envelopes from USPS. Save time and money with flat rate shipping for documents and packages., Large Envelope Properties. Select the one that most represents your mail piece. None of the following. is Rigid - does not bend easily. is NOT Rectangular or Square. contains items that cause more than 1/4 inch variation in thickness., Nov 27, 2023 · Adding Postage to 9×12 Envelopes That Weigh More Than an Ounce. Two First Class stamps will cover the cost of a 9×12 envelope that weighs an ounce or less. A First Class stamp has a value of $0.55, but the price to mail a large envelope is only $1.00, so you’ll technically be paying an extra $0.10 for the convenience of using stamps. , Learn how to properly write and position the address on your mail item to ensure fast and accurate delivery by USPS., Feb 25, 2022 · Stamps For a Large Manila Envelope (6 x 12″) Larger manila envelopes, (9 x 12 inches) are also known as flats. The price to mail a one-ounce large manila envelope with USPS is $1.16. If you are using Forever Stamps, you will need two of them to cover this 1-ounce fee structure. , The cost of sending a bubble mailer via Priority Mail Flat Rate depends on the size of the envelope, ranging from $7.95 to $22.95. You can check the exact rates and delivery times for each service by using the USPS Postage Calculator or by visiting your local post office., Shop our selection of Shipping Supplies on the USPS.com Postal Store. Go to USPS.com Site Index. Skip to Main Content Skip All Utility ... Custom Mail, Cards, & Envelopes; Postage Prices ; Mail & Shipping Services; Priority Mail Express; Priority Mail; USPS Ground Advantage; First-Class Mail ... x 12-1/2"(H) $79.00 ReadyPost® Bubble Packing ..., What is the postage for a 9 1/2 x 12 1/2 envelope? The postage for a 9 1/2 x 12 1/2 envelope will depend on the weight of the contents, as well as the destination of the envelope. In the United States, postage for this size of envelope typically starts at $1.30 for first-class mail., Priority Mail, including Priority Mail Flat Rate shipping products, has fast shipping times (1, 2, or 3 business days) with flexible prices. Get free flat rate boxes and print postage labels online. ... 12 1/2″ x 9 1/2″ Pre-addressed Envelopes. Small Flat Rate Envelope:, Shop our selection of Non-Machineable Stamps on the USPS.com Postal Store. Go to USPS.com Site Index. Skip to Main Content Skip All Utility Navigation. ... Custom Mail, Cards, & Envelopes; Postage Prices ; Mail & Shipping Services; Priority Mail Express; ... Colorado Hairstreak Stamps $1.12. Non-Machineable for Square Envelopes. $22.40 Results ..., USPS postage rates offer low-cost mailing and shipping prices for domestic & international customers. See Forever postage stamp prices and other postage rates. ... Square, Oversized, or Unusual Envelopes From $1.12. Postcard Stamps. Standard-sized, ... Priority Mail Flat Rate ® Envelope. $9.85 at the Post Office., In terms of cost, a 9×12 envelope that is filled with paper costs $1.00 and is flexible. Postage for a 9×12 flat envelope will increase by $0.20 for every additional ounce. A 9×12 envelope is classified as a large flat envelope, costing $1 to send a letter and $0.20 for each additional ounce., First-Class Mail International Affordable International Mailing. First-Class Mail International ® (FCMI) service is the most affordable way to send letters and large envelopes to more than 180 countries, including Canada, Great Britain, and Australia.. Send 1 oz letters or postcards around the world with one Global Forever ® stamp, which currently costs $1.55 and never expires, even if the ..., W IDTH LENGTH MIN. 6". 877.888.0677. 2023 USPS new pricing affects the First-Class stamp, metered mail rates, and postcards, additional ounces and postcards. The increases raise First-Class Mail prices by approximately 4.2%. These new postage rates will go into effect on January 22, 2023. Get email alerts here., How to determine which Priority® Mail type to use: Below shows pricing for USPS® provided boxes & envelopes for regular Priority® Mail, Regional Rate Boxes, and Flat Rate. 12-1/2" x 9-1/2" or 10" x 5" or 10" x 6", or 10" x 7" Up to 70 lbs. FLAT RATE Retail $7.95 CBP $7.40 12-1/2" x 9-1/2" Up to 70 lbs. FLAT RATE Retail $8 ..., 58¢ - classic forever stamp; good investment, always goes up, went up 3¢ on 3Oct2021. 20¢ - "Additional Ounce" went down from 21 to 15¢ 27Jan2019, and up to 20¢ on 3Oct2021 78¢ - "Two Ounce" (the wedding invitation stamp, heart symbol)88¢ - the "butterfly" stamps for bad envelopes (square, stiff, metal clasp)., USPS® and Carrier Rate Updates. USPS, UPS ® and FedEx ® issue mailing and shipping updates every year, and some can have a profound effect on business. Stay up to date on the latest news and updates from all carriers and how Pitney Bowes can help you save money through every change. NEW WEBINAR ON MAY 1: Countdown to the USPS 2024 mandate., The words large envelopes and flats are used interchangeably. Whatever you call them, flats must: Have one dimension that is greater than 6-1/8 inches high OR 11-½ inches long OR ¼ inch thick. Be no more than 12 inches high x 15 inches long x ¾ inch thick. Dimension. Minimum*. Maximum. Height. 6-1/8 inches., Columbian 9 x 12 Security Envelopes, 100/Box, 9 x 12 Inches, Release & Seal Self Seal, SimplySafe Tamper Evident Pull Strip, White (COLO930) ... Quality Park 9 x 12 Postage Saving ClearClasp Envelopes, with Reusable Redi-Tac Closure & Gummed Flap, 28 lb Kraft Paper, 100 per Box (QUA43568) 4.6 out of 5 stars. 421., Where things get a little funky with Forever Stamps is when you have to add extra postage to your envelope to cover heavier items going through the mail. As we mentioned earlier, the current (as of 2021) cost for each additional ounce of mail in a letter is at $0.20 per ounce while a Forever Stamp today costs $0.55., Select one of 12 free packaging options and order your complimentary packaging online.: Get your rates. Use our shipping rates calculator by giving us the delivery address, when you would like to ship and what time you’d like your package to arrive.; Or. Look through our rate chart for standard FedEx One Rate prices.; Sign into your account to create a …, You may apply standard postage rates by using a combination of stamps totaling the required value indicated in the tables below or pay the exact cost by going in to the post office. Standard Lettermail prices (consumer) Weight Single stamp or stamps Stamps in booklets/coils/panes; 0 g up to 30 g: $1.07: $0.92:, First Class Mail® Large Envelope/Flat Mail. Minimum size: 6 1/8 inches tall or 11 1/2 inches long and 0.007 inches thick. Maximum size: 12 inches tall x 15 inches long and 3/4 inches thick. Maximum weight: Up to 13 oz., Non-standard and oversize (0-500 g) Oversize or non-standard size envelopes and postcards will cost you more in postage. Maximum dimensions. 380 mm x 270 mm (15 inches x 10.6 inches) If your letter is larger than the maximum dimensions above you'll need to use our parcel services. Check out our size and weight limits for letters and documents ..., Address your 9-inch by 12-inch envelope by placing the mailing address in the center and the return address in the upper left corner on the same side as the mailing address. Bring the 9-inch by 12-inch envelope to the post office so it can be weighed on a postal weight scale to determine postage needed. Many post offices have self-serve areas ...