The United States Postal Service (USPS) classifies an envelope measuring 9 by 12 inches as a big envelope. However, what does this mean for postage? If you need to send outgoing mail that is somewhat flat but doesn’t fit in a regular letter envelope, you may be wondering how many stamps you’ll need. Learn how many stamps should be placed on a 9×12 envelope to pay its cost and assure its safe arrival.


Including Postage on 912 Envelopes Weighing Over an Ounce

Two First-Class stamps will cover the cost of a 9-by-12-inch envelope weighing less than one ounce. The value of a First-Class stamp is $0.55, but the cost to mail a large envelope is only $1.00, so you will pay an additional $0.10 for the convenience of utilising stamps.

If your 9×12 envelope weighs more than 1 ounce, you will need additional stamps, the number of which will depend on the total weight. You must pay $0.20 every additional ounce. Therefore, mailing a parcel weighing 4.3 ounces will cost $1.80, or four First-Class stamps.

If you are uncertain about pricing, you can use the USPS postage calculator to ensure that the correct amount of stamps are placed on your envelope. Nonetheless, First-Class stamps are not your sole option for postage.

Paying Postage on a 9-by-12-Inch Envelope

If you are mailing some papers or thin objects in a 9×12 envelope, you can affix two First-Class postage stamps on it and drop it into your mailbox. The postal carrier will then retrieve the item and deliver it.

Consider that if you chose this path, you may wind up paying slightly more than necessary. If you are willing to travel to your local post office, you can have your parcel weighed and pay for it using a debit card, credit card, cash, or any other payment method your local post office accepts.

This approach helps you avoid paying too much, but you may have to wait in line. When you go to the post office, you may not pay too much for postage, but you will incur a time cost for the minor annoyance. Because of this, you may want to calculate postage at home instead. Thanks to a multitude of services and useful goods, weighing and paying is simple; however, if you’re only mailing one item or don’t ship frequently, it may not be efficient.

For instance, if you prefer to avoid waiting in line at the post office while preserving your First-Class stamps, you may acquire the necessary packaging supplies based on your mailing habits. Then, you might assess your shipping expenses and print a label using an online postal service. The Click-N-Ship service of the United States Postal Service enables consumers to quickly weigh their mail and print shipping labels. Alternatively, provides users with free postal scales and discounts on mailing.

Other Variables That Can Impact the Postage Cost of Your Envelope

If your huge envelope is not perfectly flat, you may be charged extra to have it delivered to your desired location. One of the post office’s many equipment can automatically sort flat envelopes, but employees must manually sort lumpy or rigid envelopes. Because this adds a small amount of additional labour to the operation, it also increases the price.

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