A4 to A3 Conversion
A3 is exactly double A4. If you have an A4 design you want to print larger, you can scale it up to A3 by 141% (the inverse of the 70.7% reduction used when going the other way).
A4 (Original)
A4
210 × 297 mm
8.3 × 11.7 in
8.3 × 11.7 in
A3 (Enlarged)
A3
297 × 420 mm
11.7 × 16.5 in
11.7 × 16.5 in
📊 A4 → A3 Quick Facts:
• Scale Up: 141.4%
• Ratio: A3 = 2 × A4
• Enlarge Factor: Multiply all dimensions by √2
• Uses: Posters, presentations, large diagrams
• Scale Up: 141.4%
• Ratio: A3 = 2 × A4
• Enlarge Factor: Multiply all dimensions by √2
• Uses: Posters, presentations, large diagrams
📏 Complete Dimensions
| Unit | A4 | A3 |
|---|---|---|
| Millimetres | 210 × 297 mm | 297 × 420 mm |
| Centimetres | 21.0 × 29.7 cm | 29.7 × 42.0 cm |
| Inches | 8.3 × 11.7 in | 11.7 × 16.5 in |
| Pixels @ 72 DPI | 595 × 842 px | 842 × 1191 px |
| Pixels @ 300 DPI | 2480 × 3508 px | 3508 × 4961 px |
| Pixels @ 600 DPI | 4961 × 7016 px | 7016 × 9921 px |
🖨️ Printing A4 to A3
- Scale up 141% in your printer settings
- Check bleed if printing to the edge
- Verify DPI remains at least 150 for A3 quality
- Consider tiling if you don't have an A3 printer
🔁 Related Conversions
- A4 to A0 – 16× larger
- A4 to A5 – Half size
- A4 to Pixels – Digital conversion
- A3 to A4 – Reverse conversion
- A3 to A5 – Quarter size
❓ Frequently Asked Questions
How do I enlarge A4 to A3? Set your printer or software to 141% scale.
Will the quality drop? Yes, unless your original is high-resolution. Aim for 300 DPI at A3 size.