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18x24 Poster Size in Pixels at 300 DPI
An 18×24 poster at 300 DPI is 5400×7200 pixels. The ratio is 3:4, like 12×16 — not 2:3 and not 4:5. Crop to 3:4 before you resize.
Direct answer
An 18×24 inch poster at 300 DPI is 5400×7200 pixels in portrait, or 7200×5400 in landscape. 18÷24 = 3:4, the same family as 12×16 and 9×12. Crop to 3:4 around the subject from an original that still has 5400 pixels on the short side after crop. Do not stretch a 2:3 or 4:5 listing file.
18×24 is the American movie-poster size people recognize from theaters. On Etsy it collides with 16×20 and 18×24 digital downloads that were never 5400 pixels wide. The frame is unforgiving: 3:4 is boxier than 12×18 and taller than 16×20.
If your camera file cannot supply 5400 pixels after crop, sell 12×16 (same ratio, 3600×4800) instead of upscaling. Same composition, honest DPI.
- 1
Confirm 5400 px short side after crop
Otherwise offer 12×16.
- 2
Crop to 3:4
Not 2:3 or 4:5.
- 3
Resize to 5400×7200
7200×5400 for landscape 24×18.
- 4
Stamp 300 DPI
High-quality JPG, sRGB.
The 3:4 ladder
9×12 = 2700×3600. 12×16 = 3600×4800. 18×24 = 5400×7200. All 3:4. 16×24 is 2:3. 16×20 is 4:5. Three different windows.
ISO A4 is not 3:4 either. Do not stretch 18×24 to A2.
| Size | Portrait pixels |
|---|---|
| 9 × 12 in | 2700 × 3600 |
| 12 × 16 in | 3600 × 4800 |
| 18 × 24 in | 5400 × 7200 |
Crop and original size
A 6000×4000 landscape camera file is 3:2. To make 3:4 portrait you rotate usage, not the math: you need a portrait-oriented crop. Many landscape paintings cannot fill 18×24 portrait without losing the sides. List landscape 24×18 instead.
Pin the subject with the focal-point method. 3:4 keeps more of the short sides than 2:3 and less than 4:5.
Export 18×24
Open Studio, add 18 × 24 in, Export Artwork. Pair with 12×16 if both sell. Pro is $33 lifetime for batch ZIP.
Movie posters vs art prints
Theatrical one-sheets sometimes include extra billing-block space at the bottom. Your art print should not copy that empty band unless it is part of the painting. Crop to the art, not to a Hollywood template you found on Pinterest.
If a POD template lists exact pixels that are not 5400×7200, use the template. Pixels on the PDF beat a generic blog table.
FAQ: 18x24 poster size pixels 300 DPI
How many pixels is 18x24 at 300 DPI?+
5400×7200 pixels in portrait.
Is 18x24 the same as 16x20?+
No. 18×24 is 3:4. 16×20 is 4:5.
Is 18x24 the same as 12x16?+
Same ratio. 12×16 is smaller (3600×4800). Scaling 12×16 to 18×24 without a larger original is 200 DPI.
What about 18x24 at 150 DPI?+
2700×3600 pixels. Use only if the fabric or mural template says 150.
