Quick reference for standard paper sizes including ISO A/B series, North American, and Japanese JIS B series with dimensions in mm, inches, and pixels.
| Name | mm (W×H) | inches (W×H) | Pixels @72 dpi | Pixels @300 dpi |
|---|---|---|---|---|
| A0 | 841 × 1189 | 33.11 × 46.81 | 2384 × 3370 | 9933 × 14043 |
| A1 | 594 × 841 | 23.39 × 33.11 | 1684 × 2384 | 7016 × 9933 |
| A2 | 420 × 594 | 16.54 × 23.39 | 1191 × 1684 | 4961 × 7016 |
| A3 | 297 × 420 | 11.69 × 16.54 | 842 × 1191 | 3508 × 4961 |
| A4 | 210 × 297 | 8.27 × 11.69 | 595 × 842 | 2480 × 3508 |
| A5 | 148 × 210 | 5.83 × 8.27 | 420 × 595 | 1748 × 2480 |
| A6 | 105 × 148 | 4.13 × 5.83 | 298 × 420 | 1240 × 1748 |
| A7 | 74 × 105 | 2.91 × 4.13 | 210 × 298 | 874 × 1240 |
| A8 | 52 × 74 | 2.05 × 2.91 | 147 × 210 | 614 × 874 |
About Paper Size Standards
The ISO 216 standard defines the A and B series of paper sizes used internationally. The A series is the most common, with A4 being the standard for letters and documents in most countries outside North America. The B series provides intermediate sizes. North American sizes such as Letter (8.5×11 in) and Legal (8.5×14 in) are used primarily in the United States, Canada, and parts of Latin America. Japan uses its own JIS B series, which is slightly larger than the ISO B series at each corresponding number.
FAQ
Q: What is the difference between A4 and US Letter?
A: A4 is 210×297 mm (8.27×11.69 in) while US Letter is 216×279 mm (8.5×11 in). A4 is narrower and taller; Letter is wider and shorter. A4 is the global standard, while Letter is used mainly in the US and Canada.
Q: How do I calculate pixels for printing?
A: Multiply the size in inches by the DPI (dots per inch). For example, A4 at 300 DPI: 8.27×300 = 2480 pixels wide, 11.69×300 = 3508 pixels tall. 300 DPI is the standard for high-quality print.
Q: What DPI should I use for printing?
A: 300 DPI is the industry standard for high-quality print such as brochures and photos. 150 DPI is acceptable for drafts or large-format posters viewed from a distance. 72 DPI is only suitable for screen display.
Q: Why does Japan use a different B series?
A: Japan adopted its own JIS B series before the ISO standard was established. JIS B sizes are calculated as the arithmetic mean of consecutive A sizes, while ISO B sizes use the geometric mean, making JIS B slightly larger.
Q: What is the most commonly used paper size in the world?
A: A4 (210×297 mm) is the most widely used paper size globally. It is the standard for documents, letters, magazines, and forms in virtually every country except the United States and Canada, which primarily use Letter size.