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Paper Size Visual Comparison – Online A4 vs Letter vs Legal

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Paper 1 Paper 2 (semi-transparent overlay) Overlap area
Paper 1
A4
210 × 297 mm | 8.27 × 11.69 in
Area: 623.7 cm²
Paper 2
Letter
215.9 × 279.4 mm | 8.50 × 11.00 in
Area: 603.2 cm²
Width diff: — Height diff: — Area diff: —

Frequently Asked Questions

What is the difference between A4 and Letter paper size?

A4 (210 × 297 mm) is slightly narrower and taller than Letter (215.9 × 279.4 mm). A4 is about 5.9 mm narrower in width but 17.6 mm taller in height. A4 has an aspect ratio of 1:√2 (≈1:1.414), while Letter has an aspect ratio of approximately 1:1.294. The A4 sheet has about 3.4% more surface area than Letter.

Why do different regions use different paper sizes?

The ISO 216 standard (A-series: A4, A3, etc.) is used in most countries worldwide. North America uses its own standards (Letter, Legal, Tabloid) based on historical imperial measurements. The A-series was designed with a mathematically elegant √2 aspect ratio, allowing perfect scaling when folded in half. The North American sizes evolved from traditional papermaking practices and were formalized by ANSI in the 20th century.

Can I print an A4 document on Letter paper?

Yes, but with some adjustments. Since A4 is taller and narrower than Letter, printing an A4 document on Letter paper typically requires scaling down to about 94-97% to fit the width, which may leave extra space at the top and bottom. Most modern printers and software (like Adobe Acrobat or Microsoft Word) offer "Fit to Page" or "Scale to Fit" options that handle this automatically.

What is Legal paper size and how does it compare?

Legal paper measures 215.9 × 355.6 mm (8.5 × 14 inches). It shares the same width as Letter but is significantly taller—by 76.2 mm (3 inches). Compared to A4, Legal is 5.9 mm wider and 58.6 mm taller. Legal size is commonly used for contracts, legal documents, and real estate paperwork in the United States and Canada.

How do A-series paper sizes relate to each other?

The A-series follows a simple rule: each size is half of the previous one when folded parallel to the shorter side. A3 (297 × 420 mm) folded in half becomes A4 (210 × 297 mm), which folded becomes A5 (148 × 210 mm), and so on. The aspect ratio of 1:√2 is preserved at every step, making scaling between sizes seamless without distortion.

Which paper size is larger—A4 or Letter?

A4 has slightly more total surface area (623.7 cm² vs 603.2 cm² for Letter), making it about 3.4% larger overall. However, Letter is wider (215.9 mm vs 210 mm), while A4 is taller (297 mm vs 279.4 mm). So neither is strictly "larger" in all dimensions—it depends on whether you prioritize width or height.

What are the most common international paper sizes?

Globally, A4 is the most widely used office paper size, standard in over 190 countries. Other common ISO sizes include A3 (posters, diagrams), A5 (notebooks, booklets), B4 (envelopes for A4), and B5 (books, journals). In North America, Letter is the standard for everyday use, with Legal used for formal documents and Tabloid (11 × 17 in) for newspapers and large-format printing.

How do I convert between paper sizes when designing documents?

When converting between A4 and Letter, maintain margins proportionally. Most design software (InDesign, Canva, Word) allows you to change page size and adjust content automatically. For precise work, note that scaling A4 to Letter width requires ~97.3% scaling, while scaling Letter to A4 width requires ~97.3% as well (since widths differ by only 2.7%). Always check your printer settings for "Scale to Fit" options to avoid content being cut off.

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