18 x 24 Inches to Pixels
18 × 24 inches is 5,400 × 7,200 pixels at 300 DPI, 2,700 × 3,600 pixels at 150 DPI and 1,728 × 2,304 pixels at the 96 PPI screen standard.
Edit any field to convert a different size at the same resolution.
18 × 24 inches in pixels at every common resolution
The pixel count changes with the resolution you are working to — these are the values you are most likely to need.
| Resolution | Width × height in pixels | Typical use |
|---|---|---|
| 72 DPI | 1,296 × 1,728 | Legacy web |
| 96 DPI | 1,728 × 2,304 | Screen and CSS |
| 150 DPI | 2,700 × 3,600 | Posters and drafts |
| 300 DPI | 5,400 × 7,200 | Photo and magazine print |
| 600 DPI | 10,800 × 14,400 | Fine art and line work |
How the conversion works
Pixels are found by multiplying the length in inches by the pixel density: pixels = inches × DPI. For 18 × 24 inches at 300 DPI that is 18 × 300 = 5,400 and 24 × 300 = 7,200.
18 × 24 inches is a common poster size.
Hung and read from about a metre away, 150 to 200 DPI is indistinguishable from 300, so 2,700 × 3,600 pixels is usually all it needs rather than the 5,400 × 7,200 a 300 DPI file would carry.
That works out at 38.9 megapixels at 300 DPI, or 9.7 megapixels at 150 DPI. In metric the same size is 45.72 × 60.96 cm.
Frequently asked questions
How many pixels is 18 × 24 inches, a common poster size?
5,400 × 7,200 pixels at 300 DPI, 2,700 × 3,600 at 150 DPI and 1,728 × 2,304 at the 96 PPI screen standard. Multiply the inches by whichever density you are working to.
How many pixels is 18 × 24 inches at 300 DPI?
5,400 × 7,200 pixels. That is the standard density for photographic and magazine printing.
What is 18 × 24 inches in centimetres?
45.72 × 60.96 cm, because one inch is exactly 2.54 centimetres.
Does this size really need 300 DPI?
Usually not. Something this size is read from about a metre away, and at that distance 150 to 200 DPI is indistinguishable from 300. That is 2,700 × 3,600 pixels rather than 5,400 × 7,200 — a quarter of the file for no visible loss.
Is 18 × 24 a 3:4 ratio?
Yes. That is 3:4, which is not a standard print shape: the closest is a Letter page, and fitting it means losing about 3% along the long edge.
Why does the pixel count change with DPI?
A pixel has no fixed physical size. The DPI value says how many pixels fill one inch, so raising it raises the pixel count needed to cover the same physical space.