What is the most common brochure size in the United States?

In the United States, 8.5 x 11 (US Letter) is the most common brochure size, usually tri-folded into six panels. It runs on every commercial press without custom setup and fits standard envelopes, which is why it is the default for so much printed marketing.

• Flat size: 8.5 x 11, US Letter
• Folded: tri-fold creates six panels of roughly 3.67 x 8.5 each
• Mailing and display: fits #10 envelopes for direct mail and slots into standard brochure racks
• International equivalent: A4, at 8.3 x 11.7, holds the same top spot outside North America
• Common uses: marketing brochures, menus and informational handouts