![]() ![]() In the 1870s, an envelope manufacturer named William Irwin Martin created a system to identify envelopes by size for a publication called the Stationers’ Handbook of 1876. Prior to Martin’s system, envelope sizes were determined by envelope manufacturers. It may seem ironic that the #10 envelope boasts no mention of 10 in its dimensions. To learn more about how to capture the accurate measurements of a #10 envelope, click here to download our guide “How to Measure a #10 Envelope”. Number ten envelopes are typically open side, as the envelopes open on the side with the longer dimension. Often, these small variations allow for improved inserter speed. (4 1/8 inches high by 9 1/2 inches long.)Īt Tension, we customize envelope sizes based on our customers’ requirements – a number ten to one customer may be a few millimeters different than another customer’s #10. ![]() The most common size of a #10 envelope is 4.125 x 9.5 inches. This envelope is often called a “letter envelope” by big-box stores because an 8½ x 11 piece of paper fits in it securely. Not only is it the most common transactional and billing outer envelope, the #10 is a direct mail workhorse. Open up your mailbox nearly any day and a number 10 envelope is likely one of the first envelopes you see.
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