18 × 24 inch poster size in pixels
18 × 24 inch poster is 18 × 24 in. In pixels that is 5400 × 7200 at 300 DPI for print and 1296 × 1728 at 72 DPI.
18 × 24 inches is a medium poster, common for event and art prints. It measures 18 × 24 in, or 457.2 × 609.6 mm.
| Resolution | Pixels (portrait) | With 0.125 in bleed | Megapixels | Uncompressed |
|---|---|---|---|---|
| 72 DPI | 1296 × 1728 | 1314 × 1746 | 2.2 | 6.4 MB |
| 96 DPI | 1728 × 2304 | 1752 × 2328 | 4 | 11 MB |
| 100 DPI | 1800 × 2400 | 1825 × 2425 | 4.3 | 12 MB |
| 150 DPI | 2700 × 3600 | 2738 × 3638 | 9.7 | 28 MB |
| 200 DPI | 3600 × 4800 | 3650 × 4850 | 17 | 49 MB |
| 240 DPI | 4320 × 5760 | 4380 × 5820 | 25 | 71 MB |
| 300 DPI | 5400 × 7200 | 5475 × 7275 | 39 | 111 MB |
| 400 DPI | 7200 × 9600 | 7300 × 9700 | 69 | 198 MB |
| 600 DPI | 10800 × 14400 | 10950 × 14550 | 156 | 445 MB |
| 1200 DPI | 21600 × 28800 | 21900 × 29100 | 622 | 1.74 GB |
Landscape is the same numbers the other way round. Pixels are rounded to the nearest whole pixel. The last column is 8-bit RGB before compression.
Which resolution to use for 18 × 24 inch poster
For print that will be held and read, use 300 DPI: 5400 × 7200 pixels, 39 megapixels. A sheet this large is usually seen from further back, so 150 DPI (2700 × 3600 pixels) is often enough and a quarter of the file. For a screen, the DPI number does nothing; only the pixel size matters.
Will a photo fill it?
- A 12 megapixel phone photo (4000 × 3000 pixels), cropped to fill 18 × 24 inch poster, prints at 167 DPI: fine from a step back, a little soft up close.
- A 24 megapixel camera photo (6000 × 4000 pixels), cropped to fill 18 × 24 inch poster, prints at 222 DPI: fine from a step back, a little soft up close.
- A 48 megapixel photo (8000 × 6000 pixels), cropped to fill 18 × 24 inch poster, prints at 333 DPI: sharp at any distance.