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#10 Business

9.5 x 4.1 inch
/
241.3 x 104.8 mm

The #10 Business envelope has a width of 9.5 inches and a height of 4.125 inches, giving it a total surface area of 39.19 square inches. Its maximum enclosure size is 3.875 x 9.25 inches. This envelope is also known as the standard letter envelope.

The #10 gets its numbering from William Irwin Martin's late 1800s system that standardized envelope sizes. The #10 became the most popular business envelope size due to its versatile dimensions fitting both letter paper and various common inserts. Today the #10 is ubiquitous as both a business and commercial mail envelope. Its roomy size accommodates everything from letters, bills, brochures, catalogs and more. The #10 letter envelope remains the most widely used size for both transactional and advertising mailing purposes. Its popularity ensures availability and efficiency.

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