Paper Sizes Chart
A complete reference chart of standard paper sizes in millimeters and inches, including the international A-series and North American Letter, Legal, and Tabloid formats.
The A-Series (ISO 216)
The A-series is the international standard for paper sizes, used in most countries outside North America. Each size is exactly half the area of the one before it — A4 is half of A3, A5 is half of A4, and so on. A4 is the most common size, used for letters, documents, and printing worldwide.
US Paper Sizes
The United States and Canada use a different system based on inches rather than the metric A-series. Letter (8.5 x 11 in) is the standard size for everyday documents, Legal is used for contracts and legal documents, and Tabloid is used for larger prints and newspapers.
| Size | Millimeters | Inches |
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Frequently Asked Questions
What is the most common paper size?
A4 (210 x 297 mm) is the most widely used paper size internationally, while Letter (8.5 x 11 in) is standard in the United States and Canada.
What is the difference between A4 and Letter size?
A4 is slightly taller and narrower than Letter size. A4 is 210 x 297 mm (8.3 x 11.7 in), while Letter is 216 x 279 mm (8.5 x 11 in).
Why does each A-series size double or halve?
The A-series is designed so each size is exactly half the area of the previous one when folded or cut in half along its longer side, which keeps the same aspect ratio across all sizes — useful for scaling documents up or down without distortion.