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Convert between ISO and US paper sizes
| Name | Width (mm) | Height (mm) | Width (in) | Height (in) |
|---|---|---|---|---|
| A0 | 841 | 1189 | 33.11 | 46.81 |
| A1 | 594 | 841 | 23.39 | 33.11 |
| A2 | 420 | 594 | 16.54 | 23.39 |
| A3 | 297 | 420 | 11.69 | 16.54 |
| A4 | 210 | 297 | 8.27 | 11.69 |
| A5 | 148 | 210 | 5.83 | 8.27 |
| A6 | 105 | 148 | 4.13 | 5.83 |
| Letter | 215.9 | 279.4 | 8.50 | 11.00 |
| Legal | 215.9 | 355.6 | 8.50 | 14.00 |
| Tabloid | 279.4 | 431.8 | 11.00 | 17.00 |
| Executive | 184.15 | 266.7 | 7.25 | 10.50 |
| B4 | 250 | 353 | 9.84 | 13.90 |
| B5 | 176 | 250 | 6.93 | 9.84 |
ISO A Series: Based on an aspect ratio of 1:√2. Each size is half of the previous (A1 is half of A0, A2 is half of A1, etc.).
US Sizes: Letter (8.5 × 11") and Legal (8.5 × 14") are standard in North America. Tabloid (11 × 17") is double Letter size.
No. A4 (210 × 297 mm or 8.27 × 11.69") is slightly narrower and taller than Letter (8.5 × 11" or 215.9 × 279.4 mm). Documents may need adjustment when converting between formats.
A4 is standard worldwide except in the US and Canada, where Letter size is predominant. A4 is used in over 150 countries and is the ISO 216 standard.
The √2 ratio (1.414:1) means when you fold or cut an A-series sheet in half, it retains the same proportions. A4 folded becomes A5, A3 folded becomes A4, maintaining the aspect ratio.
B-series paper is slightly larger than A-series. B4 is between A3 and A4 in size. B-series is commonly used for posters, books, and envelopes designed to fit A-series paper.
Yes, but expect slight cropping or margins. Most printers have a "fit to page" option that scales A4 to fit Letter (or vice versa) while maintaining aspect ratio.
Legal size (8.5 × 14") is primarily used in North America for legal documents, contracts, and forms. The extra 3 inches of height provides more space for lengthy documents while maintaining standard width.