Reference library
Poster Print Size
A popular poster size is 18 x 24 in, with 11 x 17 used for small posters and 24 x 36 used for larger event or retail displays.
Last checked: 2026-05-01
How we calculate this
Methodology and source handling
We convert physical sizes to inches, multiply by the selected DPI/PPI value, and round to whole pixels.
Quick answer
Copy-ready answer
Use 18 x 24 in for a versatile poster. At 150 DPI, trim artwork is 2700 x 3600 px; at 300 DPI it is 5400 x 7200 px.
Dimensions and specs
| Trim size | 18 x 24 in | |
|---|---|---|
| Metric trim | 457.2 x 609.6 mm | |
| Aspect ratio | 3:4 | |
| 150 DPI trim | 2700 x 3600 px | |
| Bleed canvas | 18.25 x 24.25 in (463.55 x 615.95 mm) | |
| 150 DPI with bleed | 2738 x 3638 px | |
| Popular variants | 11 x 17, 18 x 24, 24 x 36 in | |
| Best for | Indoor announcements, retail signs, event posters |
Pixels
Pixel dimensions by DPI
| DPI / PPI | Width | Height | Use |
|---|---|---|---|
| 72 DPI | 1296 px | 1728 px | Rough layout or very distant viewing |
| 96 DPI | 1728 px | 2304 px | Digital proofing and mockups |
| 150 DPI | 2700 px | 3600 px | Common large-format production target |
| 200 DPI | 3600 px | 4800 px | Closer indoor viewing distance |
| 300 DPI | 5400 px | 7200 px | High-detail large-format artwork |
Formula
How to calculate this size
457.2 mm x 150 PPI = 2,700 px wide.
Use this when the artwork stops at the finished edge.
Add 3.18 mm per side before calculating pixels when artwork reaches the edge.
Common mistakes
Avoid these print setup mistakes
If artwork reaches the edge, add bleed before export so small cutting shifts do not leave a white border.
Keep names, prices, QR codes, and calls to action inside the safe area, not directly on the trim line.
Close-viewed print usually needs 300 DPI; large signs and banners can use lower effective PPI when viewed from farther away.
Calculator
Calculate pixels and bleed
Enter any DPI to calculate the pixel dimensions for this physical size.
Compare
Compare Poster Print Size
Open a curated comparison or send both sizes into the compare tool with a fragment URL.
Use 11 x 17 in for small posters that can be printed or pinned easily, and 24 x 36 in when visibility from farther away is more important. Because posters are viewed from different distances, 150 DPI can be acceptable for many large-format jobs, while 300 DPI gives extra detail for close viewing.
Workflow
Use Poster Print Size in a finished file
Set the finished product size before adding bleed or safe margin.
Extend backgrounds past trim and keep text inside the safe area.
Export PDF or raster files at the requested PPI and check crop marks before handoff.
Related
Related pages and tools
Same branch
Nearby pages
FAQ
Common questions
What is a standard poster size?
Popular poster sizes include 11 x 17, 18 x 24 and 24 x 36 in. The 18 x 24 in size is a versatile indoor default.
What pixel size is an 18 x 24 poster?
At 150 DPI, an 18 x 24 in poster is 2700 x 3600 px. At 300 DPI, it is 5400 x 7200 px.
Is 150 DPI enough for posters?
Often yes for large-format posters viewed from a distance. Use 300 DPI when the poster will be inspected up close or includes fine detail.
How much bleed should a poster have?
Use the printer template. A common small-format bleed is 0.125 in per side, but some large-format printers request different bleed or no bleed depending on mounting and trimming.
Which poster size should I choose?
Use 11 x 17 for small indoor notices, 18 x 24 for general event posters and 24 x 36 for stronger visibility.
References
Sources and references
Commercial print dimensions are checked against reputable print-provider references. Bleed guidance follows Adobe and printer setup recommendations; final requirements should be confirmed with the printer.
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UPrinting: print sizing tips
Used as a commercial print reference for common flyer, brochure, rack card, booklet, banner, and catalog sizes.
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Adobe InDesign print bleed guidance
Used for bleed, crop-mark, and print setup guidance.
Last checked: 2026-05-01