A4
Dimensions: 210 × 297 mm (8.27 × 11.69 in)
A4 is a widely used paper size for letters, forms and everyday office documents in ISO-based workflows. It's part of the ISO 216 standard.
What size is A4 paper?
An A4 piece of paper measures 210 × 297 mm or 8.27 × 11.69 inches. It is part of the A Paper Sizes standard.
| Units | Width × Height |
|---|---|
| Metric millimeters (mm) | 210 × 297 mm |
| Metric centimeters (cm) | 21.00 × 29.70 cm |
| Metric meters (m) | 0.210 × 0.297 m |
| Imperial inches (in) | 8.27 × 11.69 in |
| Typographic points (1/72 inch) (pt) | 595.28 × 841.89 pt |
| Typographic picas (1/6 inch) (pc) | 49.61 × 70.16 pc |
| Pixels at 300 DPI (px) | 2,480 × 3,508 px |
A4 is part of the a paper sizes standard. The A series traces its standardised dimensions to DIN 476, published in Germany in 1922. Georg Christoph Lichtenberg had described the underlying square-root-of-two aspect-ratio principle in 1786. ISO 216 brought the A and B trimmed-paper formats into an international standard in 1975; numbered A sizes retain approximately the same proportions as each sheet is halved.
Also called: ISO A4.
Quick facts
- Size (mm)210 × 297 mm
- Size (inches)8.27 × 11.69 in
- Aspect ratio1 : √2 (≈ 1.414)
- StandardISO 216
- Common useLetters, forms and everyday office documents in ISO-based workflows
Compare A4 with other sizes
Uses for A4
A4 is used for letters, forms and everyday office documents in ISO-based workflows.
- Letters, forms and reports
- Contracts, invoices and statements
- School and office handouts
- Everyday home printing and photocopying
Loading A4 into a printer
Most home document printers accept A4; move the tray guides to the A4 marks and match the driver setting instead of leaving it on Letter.
A4 at common DPI
Pixel dimensions for A4 at popular resolutions. Rounded to whole pixels; physical sheet remains 210 × 297 mm.
| DPI | Width (px) | Height (px) |
|---|---|---|
| 72 | 595 | 842 |
| 96 | 794 | 1,123 |
| 150 | 1,240 | 1,754 |
| 300 | 2,480 | 3,508 |
| 600 | 4,961 | 7,016 |
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210 × 297 mm (8.27 × 11.69 in)