Paper size in pixels
A3 Size in Pixels
A3 measures 297 × 420 mm (11.69 × 16.54 in). At 300 DPI an A3 canvas is 3508 × 4961 pixels in portrait orientation.
A3 at 300 DPI: 3508 × 4961 px (landscape 4961 × 3508 px)
At 150 DPI: 1754 × 2480 px · at 72 DPI: 842 × 1191 px
A3 pixel dimensions at each DPI
Calculated from the defining millimeter dimensions, rounded to the nearest whole pixel unless stated. “DPI” here means image pixels per inch (PPI), the way most print briefs use it.
| Density | Portrait (nearest) | Landscape (nearest) | Portrait, rounded up | Megapixels |
|---|---|---|---|---|
| 72 DPI | 842 × 1191 | 1191 × 842 | 842 × 1191 | 1 |
| 96 DPI | 1123 × 1587 | 1587 × 1123 | 1123 × 1588 | 1.8 |
| 150 DPI | 1754 × 2480 | 2480 × 1754 | 1754 × 2481 | 4.3 |
| 200 DPI | 2339 × 3307 | 3307 × 2339 | 2339 × 3308 | 7.7 |
| 300 DPI | 3508 × 4961 | 4961 × 3508 | 3508 × 4961 | 17.4 |
| 600 DPI | 7016 × 9921 | 9921 × 7016 | 7016 × 9922 | 69.6 |
Calculate a canvas with your own settings
Your dimensions
On your device3,508 × 4,961 pixels
297 × 420 mm at 300 PPI · nearest pixel
- Total pixels
- 17.403 MP
- Width density
- 300.0108 PPI
- Height density
- 300.0224 PPI
Nearest-pixel rounding can fall slightly below the target on one axis. Use Round up when the target is a strict minimum.
This is the canvas size. Changing a file’s PPI metadata alone does not create these pixels.
Calculation details & inputs
| Print width | 297 |
|---|---|
| Print height | 420 |
| Size unit | Millimeters (mm) |
| Target resolution | 300 PPI |
| Pixel rounding | Nearest whole pixel |
| Required width (px) | 3,508 |
|---|---|
| Required height (px) | 4,961 |
| Exact width before rounding (px) | 3,507.874016 |
| Exact height before rounding (px) | 4,960.629921 |
| Effective width PPI | 300.010774 |
| Effective height PPI | 300.022381 |
About A3
A3 is twice A4: two A4 pages side by side. It is close to, but not the same as, US Tabloid (11 × 17 in): A3 is wider and shorter.
| Unit | Width × height |
|---|---|
| Millimeters | 297 × 420 |
| Centimeters | 29.7 × 42 |
| Inches | 11.693 × 16.535 |
Rounding the canvas
At 300 PPI the exact width is 3,507.874 pixels and the height 4,960.63 pixels, so a whole-pixel canvas must round. Nearest rounding gives 3508 × 4961; rounding up gives 3508 × 4961, which keeps both axes at or above 300 PPI.
The aspect ratio is 1 : 1.4141, the √2 proportion shared by every A size, so A sizes scale into each other without cropping. Bleed is not included: add your provider’s bleed to each edge before calculating the file size.
Questions about this conversion
What is A3 in pixels at 300 DPI?
3508 × 4961 pixels portrait, or 4961 × 3508 landscape, about 17.4 megapixels.
What is A3 in pixels at 72 or 96 DPI?
At 72 DPI: 842 × 1191 px. At 96 DPI: 1123 × 1587 px. These low densities suit on-screen previews and document templates rather than photo printing.
Does the page size include bleed or printer margins?
No. These are the nominal finished sheet dimensions. Bleed, safe areas and a printer’s unprintable margins are separate and depend on your provider and device.