12 × 18 inch poster at 600 DPI is 7200 × 10800 pixels
12 × 18 inch poster (12 × 18 in) at 600 DPI is 7200 × 10800 pixels, which is 78 megapixels.
| Portrait | 7200 × 10800 pixels |
|---|---|
| Landscape | 10800 × 7200 pixels |
| With 0.125 in bleed | 7350 × 10950 pixels |
| Megapixels | 78 |
| Aspect ratio | 2:3 |
| File size | 222 MB as uncompressed 8-bit RGB; a JPEG or PNG is smaller |
| Paper size | 12 × 18 in (304.8 × 457.2 mm) |
The working
Pixels are inches multiplied by the resolution.
- Width: 12 in × 600 = 7,200, which rounds to 7200 pixels.
- Height: 18 in × 600 = 10,800, which rounds to 10800 pixels.
Bleed is extra image past the trim line, so that a cut that lands slightly off still leaves ink to the edge. Print shops usually ask for 0.125 in on every side of a US size, which makes the file 7350 × 10950 pixels.
Is your photo big enough?
To fill 12 × 18 inch poster at 600 DPI an image needs at least 7200 × 10800 pixels. Cropped to fill the sheet:
- A 12 megapixel phone photo (4000 × 3000) gives 222 DPI: short of 600, so it would be upscaled or printed softer.
- A 24 megapixel camera photo (6000 × 4000) gives 333 DPI: short of 600, so it would be upscaled or printed softer.
- A 48 megapixel photo (8000 × 6000) gives 444 DPI: short of 600, so it would be upscaled or printed softer.
At 600 DPI the pixels of a print blend together from about 5.7 inches (15 cm) away. 600 DPI is used for line art, small text and scans that will be enlarged. It is also the native resolution of many office laser printers.
12 × 18 inch poster at other resolutions
| Resolution | Pixels | With bleed | Megapixels | Uncompressed |
|---|---|---|---|---|
| 72 DPI | 864 × 1296 | 882 × 1314 | 1.1 | 3.2 MB |
| 96 DPI | 1152 × 1728 | 1176 × 1752 | 2 | 5.7 MB |
| 100 DPI | 1200 × 1800 | 1225 × 1825 | 2.2 | 6.2 MB |
| 150 DPI | 1800 × 2700 | 1838 × 2738 | 4.9 | 14 MB |
| 200 DPI | 2400 × 3600 | 2450 × 3650 | 8.6 | 25 MB |
| 240 DPI | 2880 × 4320 | 2940 × 4380 | 12 | 36 MB |
| 300 DPI | 3600 × 5400 | 3675 × 5475 | 19 | 56 MB |
| 400 DPI | 4800 × 7200 | 4900 × 7300 | 35 | 99 MB |
| 600 DPI | 7200 × 10800 | 7350 × 10950 | 78 | 222 MB |
| 1200 DPI | 14400 × 21600 | 14700 × 21900 | 311 | 890 MB |
Other sizes at 600 DPI
- A0
- A1
- A2
- A3
- A4
- A5
- A6
- A7
- Letter
- Legal
- Tabloid
- Half Letter
- 4 × 6 in
- 5 × 7 in
- 8 × 10 in
- 11 × 14 in
- 16 × 20 in
- 12 × 12 in
- 18 × 24 in
- 24 × 36 in
- Business card
12 × 18 inches is a small poster with the 2:3 shape of a camera frame, so a photo fills it without cropping. See 12 × 18 inch poster in pixels at every resolution or everything at 600 DPI.