A3 Paper Size
A3 is 297 × 420 mm — exactly two A4 sheets side by side. At 300 DPI, it's 3508 × 4961 pixels. The most common uses are restaurant menus, café specials boards, small event posters for indoor notice boards, and double-page spreads in print publications. The US equivalent is 11×17 in (Tabloid/Ledger).
Specifications
| Pixels | 3508 × 4961 px (at 300 DPI) |
| Millimetres | 297 × 420 mm |
| Centimetres | 29.7 × 42.0 cm |
| Inches | 11.69 × 16.54 in |
| Aspect ratio | 1:1.414 |
| Colour mode | CMYK |
| Bleed | 3 mm |
| Safe zone | 5 mm from trim |
A3 in Pixels at Different DPI
The pixel count changes with DPI setting — choose the right one for your output.
| DPI | Width (px) | Height (px) | Use |
|---|---|---|---|
| 72 | 842 | 1,191 | Screen preview, PDF viewers |
| 96 | 1,123 | 1,588 | Windows screen standard, digital documents |
| 150 | 1,754 | 2,481 | Medium-quality print, home printers |
| 300 | 3,508 | 4,961 | Professional print, commercial offset |
Design Tips
- →A3 is the minimum readable poster size for indoor viewing at 2–3 metres — below this, viewers need to step closer. Keep headline type at 36 pt or larger.
- →For double-page spreads, set the canvas at A3 (297 × 420 mm) and mark the A4 centreline at 148.5 mm. Allow for 5 mm gutter bleed on both sides of the spine.
- →A3 is widely available at office laser printers — check printer specs for bleed support before designing edge-to-edge artwork.
- →Laminated A3 menus are typically 297 × 420 mm plus 5 mm lamination overlap on each edge; account for this in your mounting design.
Create A3 designs with Playyy
Set a custom canvas to 3508 × 4961 px, generate visuals from a text prompt, and export at the right dimensions — no design software needed.
Start designing free →Frequently Asked Questions
What are A3 dimensions in cm?+
A3 is 29.7 × 42.0 cm (297 × 420 mm). It's exactly twice the area of an A4 sheet. Two A4 pages placed side by side in landscape orientation equal one A3.
What is A3 in pixels at 300 DPI?+
A3 at 300 DPI is 3508 × 4961 pixels. At 150 DPI it's 1754 × 2480 px. At 96 DPI it's 1123 × 1587 px. For professional print, always design at 300 DPI to avoid pixelation when the sheet is printed at full size.
How big is an A3 sheet?+
A3 is 297 × 420 mm (29.7 × 42.0 cm, or 11.69 × 16.54 inches). It's half the area of A2 and twice the area of A4. The US equivalent is 11 × 17 inches (Tabloid size).
What is A3 paper size in inches?+
A3 is 11.69 × 16.54 inches. The closest US paper size is Tabloid or Ledger at 11 × 17 inches — Tabloid is slightly taller (by 0.46 in) and slightly narrower (by 0.69 in) than A3.