ISO A-series reference
A3 paper size in pixels, mm and inches
A3 is exactly 297 × 420 mm. Set a whole PPI to prepare an image for portrait or landscape output.
A3 quick answer
What size is A3 in pixels?
A3 is 297 × 420 mm, 29.7 × 42 cm, or approximately 11.69 × 16.54 inches.
At 300 PPI, portrait A3 rounds to 3508 × 4961 pixels; landscape reverses the pair to 4961 × 3508 pixels.
Pixels = millimetres ÷ 25.4 × PPI. Pixel dimensions change with PPI, while the physical A3 size stays fixed.
Immediate pixel reference
A3 — pixels at common PPI values
Pixel dimensions depend on PPI. These portrait and landscape values use the format's exact physical dimensions and round only the final result to the nearest whole pixel.
| PPI | Portrait pixels | Landscape pixels |
|---|---|---|
| 72 | 842 × 1191 px | 1191 × 842 px |
| 96 | 1123 × 1587 px | 1587 × 1123 px |
| 150 | 1754 × 2480 px | 2480 × 1754 px |
| 300 | 3508 × 4961 px | 4961 × 3508 px |
| 600 | 7016 × 9921 px | 9921 × 7016 px |
Frontend-only exact arithmetic
Paper and resolution
Calculated sheet
A3 · 300 PPI
- mm
- 297 × 420
- cm
- 29.7 × 42
- in
- 11.6929 × 16.5354
- Nearest whole pixels
- 3508 × 4961 px
Exact pixel dimensions
445500/127 × 630000/127 px
Decimal display: 3507.874 × 4960.6299 pxpixels = tenthsMm × PPI / 254Scale comparison with A4
The silhouettes share one physical scale. They are a visual comparison, not a print preview.