Paper Sizes Guide

Understanding paper sizes is essential for printing, design, and document preparation. Different regions use different standard paper sizes, and choosing the right one ensures your documents print correctly and look professional.

This guide covers the most common paper sizes used worldwide, their dimensions, and practical applications to help you make informed decisions for your printing projects.

The ISO 216 standard defines the A series of paper sizes, widely used internationally except in North America. The A series is based on a constant aspect ratio of √2 (approximately 1:1.414), which means each size is exactly half the area of the next larger size.

Common A Series Sizes

Key Advantage: The √2 aspect ratio means you can fold an A4 sheet in half to get A5, or combine two A4 sheets to make A3, without any waste or distortion.

North America uses a different set of standard paper sizes, primarily based on imperial measurements. These sizes are standard in the United States, Canada, and Mexico.

Common North American Sizes

Note: Letter size (8.5 × 11 in) is slightly wider and shorter than A4 (210 × 297 mm), which can cause formatting issues when converting documents between regions.

The two most common paper sizes worldwide are A4 (international) and Letter (North American). Understanding their differences is crucial for international document exchange.

Practical Tip: When designing documents for international use, use A4 size and ensure margins are sufficient to accommodate Letter size printing without cutting off content.

Beyond the A series and North American standards, several other paper sizes are used for specific purposes.

B Series (ISO)

The B series is used for posters, passports, and envelopes. B sizes are intermediate between consecutive A sizes.

• B4: 250 × 353 mm - Between A4 and A3
• B5: 176 × 250 mm - Books and small posters

C Series (ISO)

The C series is primarily used for envelopes designed to hold A series paper.

• C4: 229 × 324 mm - Holds unfolded A4 paper
• C5: 162 × 229 mm - Holds A4 folded in half
• C6: 114 × 162 mm - Holds A4 folded twice

Selecting the appropriate paper size depends on your project's purpose, audience, and distribution method.

Getting the best results when printing requires understanding how to configure your printer and software for different paper sizes.

General Printing Guidelines

• Check Printer Settings: Always verify your printer supports the paper size before printing. Most modern printers support A4, Letter, and Legal sizes.
• Set Page Size in Software: Configure your document's page size in your editing software (Word, PDF reader, etc.) to match your paper before printing.
• Mind the Margins: Most printers cannot print to the edge of the paper. Leave at least 0.5 inch (12.7 mm) margins on all sides.
• Test Print: For important documents, always do a test print to ensure proper sizing and alignment.
• Scale to Fit: When printing A4 documents on Letter paper (or vice versa), use the 'Scale to Fit' or 'Shrink to Fit' option to avoid content being cut off.