A3
Dimensions: 297 × 420 mm (11.69 × 16.54 in)
A3 is a widely used paper size for A3 provides space for diagrams, spreadsheets and small posters that are cramped on A4. It's part of the ISO 216 standard.
What size is A3 paper?
An A3 piece of paper measures 297 × 420 mm or 11.69 × 16.54 inches. It is part of the A Paper Sizes standard.
| Units | Width × Height |
|---|---|
| Metric millimeters (mm) | 297 × 420 mm |
| Metric centimeters (cm) | 29.70 × 42.00 cm |
| Metric meters (m) | 0.297 × 0.420 m |
| Imperial inches (in) | 11.69 × 16.54 in |
| Typographic points (1/72 inch) (pt) | 841.89 × 1190.55 pt |
| Typographic picas (1/6 inch) (pc) | 70.16 × 99.21 pc |
| Pixels at 300 DPI (px) | 3,508 × 4,961 px |
A3 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 A3.
Quick facts
- Size (mm)297 × 420 mm
- Size (inches)11.69 × 16.54 in
- Aspect ratio1 : √2 (≈ 1.414)
- StandardISO 216
- Common useA3 provides space for diagrams, spreadsheets and small posters that are cramped on A4
Compare A3 with other sizes
Uses for A3
A3 provides space for diagrams, spreadsheets and small posters that are cramped on A4.
- Spreadsheets and wide tables
- Two-page spreads and booklets
- Small posters and notices
- Drawings, diagrams and print proofs
Loading A3 into a printer
A typical A4/Letter home printer cannot feed A3; use an A3-capable printer and select A3 in both the document and driver.
A3 at common DPI
Pixel dimensions for A3 at popular resolutions. Rounded to whole pixels; physical sheet remains 297 × 420 mm.
| DPI | Width (px) | Height (px) |
|---|---|---|
| 72 | 842 | 1,191 |
| 96 | 1,123 | 1,587 |
| 150 | 1,754 | 2,480 |
| 300 | 3,508 | 4,961 |
| 600 | 7,016 | 9,921 |
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297 × 420 mm (11.69 × 16.54 in)