What is the difference between US Letter and A4 paper sizes?

US Letter paper measures 8.5 by 11 inches, commonly used in the US, Canada, and Mexico, while A4 paper is 8.27 by 11.69 inches and is the international standard in most other countries.

Why is 8.5 x 11 inches the standard letter size in the US?

The 8.5 x 11 inch size became standard in the US due to historical printing and office equipment standards that favored this dimension for efficiency and compatibility.

Can I use letter size paper in printers outside the US?

While letter size paper can physically fit in many printers worldwide, most printers outside the US default to A4 size, so you may need to adjust printer settings when using letter size paper.

What Are the Dimensions of Standard Letter Size Paper?

Learn the exact dimensions of standard letter size paper used in the US, Canada, and Mexico—8.5 by 11 inches.

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Oct 22, 2026

Standard letter size is 8.5 inches by 11 inches. This size, often referred to as 'Letter' or 'US Letter,' is the most common paper size used in the United States and parts of Mexico and Canada for everyday printing and document creation.

FAQs & Answers

What is the difference between US Letter and A4 paper sizes? US Letter paper measures 8.5 by 11 inches, commonly used in the US, Canada, and Mexico, while A4 paper is 8.27 by 11.69 inches and is the international standard in most other countries.
Why is 8.5 x 11 inches the standard letter size in the US? The 8.5 x 11 inch size became standard in the US due to historical printing and office equipment standards that favored this dimension for efficiency and compatibility.
Can I use letter size paper in printers outside the US? While letter size paper can physically fit in many printers worldwide, most printers outside the US default to A4 size, so you may need to adjust printer settings when using letter size paper.

Watch More

For more insights on paper sizes and printing standards, explore our guides on A4 paper dimensions, international paper sizes, and tips for choosing the right paper for your printing needs.

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