PrintPixel18×24 Photo Size in Pixels
An 18×24 inch print is a large poster-size frame with a native 3:4 ratio — the same as many phone cameras. Here's how many pixels a sharp 18×24 needs.
18×24 is 457.2 × 609.6 mm (45.7 × 61.0 cm, 18 × 24 in). At 300 PPI that's 5400 × 7200 pixels — roughly 38.9 megapixels.
| Resolution | Pixels |
|---|---|
| 300 PPI | 5400 × 7200 px |
| 240 PPI | 4320 × 5760 px |
| 200 PPI | 3600 × 4800 px |
| 150 PPI | 2700 × 3600 px |
Pixel dimensions are computed from the physical size of 18 × 24 in at each resolution.
18 × 24 in at common resolutions
| Resolution | Pixels | Physical size |
|---|---|---|
| 300 PPI | 5400 × 7200 px | 45.7 × 61.0 cm |
| 240 PPI | 4320 × 5760 px | 45.7 × 61.0 cm |
| 200 PPI | 3600 × 4800 px | 45.7 × 61.0 cm |
| 150 PPI | 2700 × 3600 px | 45.7 × 61.0 cm |
Pixel counts are computed from the real physical dimensions of 18 × 24 in at each resolution — they are not hard-coded. To get these values for any other print size, use the calculator above.
18×24 at common resolutions
The physical size of 18×24 is fixed — 457 × 610 mm — but the number of pixels needed to fill it depends on the resolution.
| Resolution | Pixels | Megapixels | Practical note |
|---|---|---|---|
| 600 PPI | 10800 × 14400 px | 155.5 MP | Exceeds most camera sensors; useful for heavy cropping or extreme enlargement |
| 300 PPI | 5400 × 7200 px | 38.9 MP | Standard for close-up photo prints |
| 240 PPI | 4320 × 5760 px | 24.9 MP | High-quality prints; sharp at normal viewing distance |
| 200 PPI | 3600 × 4800 px | 17.3 MP | Good quality for wall-mounted prints viewed from arm's length or more |
| 150 PPI | 2700 × 3600 px | 9.7 MP | Acceptable for large prints viewed from a distance |
| 72 PPI | 1296 × 1728 px | 2.2 MP | Screen resolution; not recommended for print |
PPI (pixels per inch) tells you how many pixels fit into one inch of print. 18×24 is exactly 18 inches wide × 24 inches tall. At 300 PPI that's 5400 × 7200 pixels; at 150 PPI it's 2700 × 3600 — half the pixels, covering the same 45.7 × 61.0 cm of paper.
The table above uses the real physical dimensions of 18×24 at each resolution. To get these values for any other print size, use the calculator above.
18×24 uses a 3:4 aspect ratio
18×24 is exactly 3:4 — a portrait-oriented 4:3 phone photo (width:height = 3:4) matches it exactly. Landscape photos, however, need substantial cropping to fit.
A landscape 3:2 photo (width:height = 3:2) printed portrait 18×24 loses 50% of its overall width — 25% from each side.
A landscape 4:3 photo (width:height = 4:3) printed portrait 18×24 loses roughly 44% of its overall width — about 22% from each side.
A 4:5 photo shot in landscape (width:height = 5:4) printed portrait 18×24 loses 40% of its overall width — 20% from each side.
If you'd rather not lose part of the image, the practical answer is usually to pick a print size whose ratio matches your photo. TheImage Print Size Calculator checks this for your exact file.
18×24 portrait vs landscape
In portrait orientation, 18×24 is 5400 × 7200 pixels at 300 PPI. Inlandscape it's 7200 × 5400 pixels — the same pixel count, just rotated. 18×24 works well in both orientations: portrait for single-subject displays, landscape for group photos and scenery.
Can my photo be printed at 18×24?
Compare your image's pixel dimensions to the values above. At least 5400 × 7200 pixels are needed to cover 18×24 at 300 PPI. If your image is smaller, the effective PPI drops — the print may still look fine from a normal viewing distance, but will appear softer up close.
The quickest check is tocheck your image with the Image Print Size Calculator. Upload your photo and it shows the exact resolution at 18×24, whether cropping is needed for the 3:4 ratio, and a practical quality verdict. Images are processed entirely in your browser and never uploaded.
Practical details
An 18×24 at 300 PPI needs 5400 × 7200 pixels — roughly 39 MP. Because 18×24 is 3:4, portrait-oriented 4:3 phone photos (width:height = 3:4) fit with no cropping at all, while landscape photos need substantial trimming on the long edges.
At 240 PPI, 4320 × 5760 pixels is enough for a crisp print at a normal viewing distance. If you plan to display an 18×24 on a wall viewed from a few feet away, 200 PPI (3600 × 4800 pixels) is often entirely acceptable too. At 150 PPI,2700 × 3600 pixels works for large prints viewed from a distance.
18×24 is a popular size for poster prints, gallery displays and large wall art. Its 3:4 ratio (0.75) is the portrait version of the 4:3 many phone cameras produce. But landscape photos need significant trimming: a landscape 3:2 photo printed portrait 18×24 loses 50% of its overall width — 25% from each side — and a landscape 4:3 photo loses about 44% overall (about 22% per side). A 4:5 photo shot in landscape (physically width:height = 5:4) loses 40% of its width overall. At this size, resolution matters more than usual — aim for at least 240 PPI if you'll view the print up close.
If 18×24 doesn't match your photo's ratio, 16×20 photo size in pixels is a slightly smaller frame at 4:5, and 11×14 photo size in pixels is an intermediate option at 11:14. To see how your camera's native ratio maps to an 18×24 frame, the aspect ratio calculator visualizes the crop lines. To see exactly what an 18×24 would do to your own image, the print quality checker shows the crop and the quality verdict instantly.