Poster Sizes Explained: Standard Dimensions for Every Use
US standard poster sizes span from 11x17 inches (279x432 mm) up to 40x60 inches (1016x1524 mm), while ISO international sizes range from A3 (297x420 mm) to A0 (841x1189 mm). The most common poster size for general use is 24x36 inches (610x914 mm). Below is every standard dimension with exact measurements in inches, centimeters, millimeters, and the pixel counts required for 300 DPI printing.
US Standard Poster Sizes
| Size Name | Inches (W x H) | CM (W x H) | MM (W x H) | Pixels @ 300 DPI | Aspect Ratio |
|---|---|---|---|---|---|
| Tabloid / Ledger | 11 x 17 | 27.9 x 43.2 | 279 x 432 | 3300 x 5100 | 11:17 |
| Small Poster | 18 x 24 | 45.7 x 61.0 | 457 x 610 | 5400 x 7200 | 3:4 |
| Large Poster | 24 x 36 | 61.0 x 91.4 | 610 x 914 | 7200 x 10800 | 2:3 |
| Movie One-Sheet | 27 x 40 | 68.6 x 101.6 | 686 x 1016 | 8100 x 12000 | 27:40 |
| Conference / Display | 36 x 48 | 91.4 x 121.9 | 914 x 1219 | 10800 x 14400 | 3:4 |
| Large Format | 40 x 60 | 101.6 x 152.4 | 1016 x 1524 | 12000 x 18000 | 2:3 |
For the exact metric conversion of 24x36, see our dedicated 24x36 in cm reference page.
ISO Standard Poster Sizes
The A series paper sizes defined by ISO 216 are widely used for posters outside of North America. Each A size has an aspect ratio of 1:1.414 (1 to the square root of 2), and each step down is exactly half the area of the previous size.
| Size Name | MM (W x H) | CM (W x H) | Inches (W x H) | Pixels @ 300 DPI |
|---|---|---|---|---|
| A0 | 841 x 1189 | 84.1 x 118.9 | 33.1 x 46.8 | 9933 x 14043 |
| A1 | 594 x 841 | 59.4 x 84.1 | 23.4 x 33.1 | 7016 x 9933 |
| A2 | 420 x 594 | 42.0 x 59.4 | 16.5 x 23.4 | 4961 x 7016 |
| A3 | 297 x 420 | 29.7 x 42.0 | 11.7 x 16.5 | 3508 x 4961 |
A0 is the most common ISO size for large-format academic and architectural posters. A1 and A2 are used for event advertising and transit posters throughout Europe, Asia, and Latin America.
Movie Poster Sizes
The US theatrical movie poster standard is the one-sheet at 27x40 inches (686x1016 mm). This size replaced the older 27x41 format in the 1980s and remains the dominant format for cinema lobby displays, home theaters, and collectors.
Other Movie Poster Formats
| Format | Inches (W x H) | MM (W x H) | Notes |
|---|---|---|---|
| One-Sheet | 27 x 40 | 686 x 1016 | Current US theatrical standard |
| Mini Sheet | 18 x 24 | 457 x 610 | Promotional and home video releases |
| Bus Stop / Six-Sheet | 48 x 70 | 1219 x 1778 | Outdoor transit advertising |
| Subway / Two-Sheet | 41 x 54 | 1041 x 1372 | Subway station and large indoor displays |
| Insert | 14 x 36 | 356 x 914 | Narrow format for display cases |
| Half Sheet | 22 x 28 | 559 x 711 | Vintage format, rarely produced today |
International movie posters often use different dimensions. The UK quad poster measures 30x40 inches (762x1016 mm) in landscape orientation. Japanese B2 posters are 515x728 mm. When framing movie posters, these non-standard sizes frequently require custom frames.
Academic and Conference Poster Sizes
Academic poster presentations at scientific conferences follow specific size requirements. The three most common formats are:
Standard Conference Poster Sizes
| Format | Inches (W x H) | MM (W x H) | Orientation | Use Case |
|---|---|---|---|---|
| Standard | 36 x 48 | 914 x 1219 | Landscape | Most US/international conferences |
| Large | 42 x 60 | 1067 x 1524 | Landscape | Large-format conference halls |
| ISO A0 | 33.1 x 46.8 | 841 x 1189 | Portrait | European academic conferences |
| ISO A1 | 23.4 x 33.1 | 594 x 841 | Portrait | Smaller conference sessions |
Before designing your poster, always confirm the size with your conference organizers. Many conferences provide exact dimensions in their call for papers, and poster boards vary between venues.
Design Recommendations for Academic Posters
- Title font size: 72-96 pt, readable from 10+ feet.
- Body font size: 24-32 pt minimum, readable from 3-4 feet.
- Margins: At least 1 inch (25 mm) on all sides.
- File format: PDF is universally accepted by poster printing services. Save as PDF/X-1a for the most reliable color reproduction.
- Resolution: 200-300 DPI. At the typical 36x48 size, 200 DPI (7200x9600 pixels) is the practical minimum. Most academic poster content is text and vector graphics, so DPI primarily affects raster images and photographs embedded in the poster.
Advertising and Retail Poster Sizes
Retail and advertising posters follow both standard and industry-specific sizes depending on placement.
Common Retail Poster Sizes
| Use Case | Common Sizes (inches) | Notes |
|---|---|---|
| Window display | 24 x 36, 22 x 28 | Eye-level storefront posters |
| Point of purchase | 18 x 24, 14 x 22 | Placed near registers and product displays |
| In-store signage | 36 x 48, 40 x 60 | Department headers and promotional walls |
| Standee / Easel | 24 x 36, 27 x 40 | Self-standing floor displays |
| Banner stand | 33 x 80, 36 x 92 | Roll-up retractable banner displays |
For large-format banners and outdoor signage beyond standard poster sizes, see our banner and sign sizes guide.
Transit Advertising Sizes
Transit posters used in buses, subways, and shelters have their own standards:
| Format | Inches (W x H) | MM (W x H) |
|---|---|---|
| King (bus side) | 30 x 144 | 762 x 3658 |
| Queen (bus side) | 21 x 44 | 533 x 1118 |
| Bus shelter | 46 x 67 | 1168 x 1702 |
| Subway one-sheet | 46 x 60 | 1168 x 1524 |
| Subway two-sheet | 46 x 120 | 1168 x 3048 |
Resolution Requirements by Poster Size
The required image resolution depends on both the poster size and the typical viewing distance. Posters viewed close up (gallery prints, informational displays) need higher DPI than posters viewed from across a room or hallway.
| Poster Size | Viewing Distance | Recommended DPI | Minimum Pixels (W x H) |
|---|---|---|---|
| 11 x 17 | 1-2 feet | 300 | 3300 x 5100 |
| 18 x 24 | 2-3 feet | 300 | 5400 x 7200 |
| 24 x 36 | 3-5 feet | 200-300 | 4800 x 7200 to 7200 x 10800 |
| 27 x 40 | 3-5 feet | 200-300 | 5400 x 8000 to 8100 x 12000 |
| 36 x 48 | 4-6 feet | 150-200 | 5400 x 7200 to 10800 x 14400 |
| 40 x 60 | 5-10 feet | 150 | 6000 x 9000 |
Use our DPI calculator to determine whether your image file meets the resolution requirements for your specific poster size and intended viewing distance. For a complete explanation of how DPI, resolution, and print quality relate to each other, see our DPI guide.
Poster File Preparation Checklist
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Set your document to the exact print dimensions. Design at 100% scale in your layout software (InDesign, Illustrator, Canva, PowerPoint) to avoid scaling artifacts.
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Include bleed. Add 0.125 inches (3 mm) of bleed on all sides if your design extends to the edge. This accounts for cutting tolerances.
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Use CMYK color mode for offset printing. Most professional print shops expect CMYK files. Large-format inkjet printers may accept RGB, but confirm with your printer.
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Embed all fonts or convert text to outlines. Missing fonts are the most common cause of poster printing errors.
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Export as PDF/X-1a or high-quality PDF. This format flattens transparency, embeds fonts, and ensures consistent output across different RIP software.
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Verify image resolution before export. Check that all placed images meet the DPI threshold for your poster size using the resolution table above.
Choosing the Right Poster Size
For Home Decor
The 24x36 is the most versatile poster size for home walls. It fits standard poster frames and is large enough to serve as a focal point without overwhelming a room. For smaller spaces, 18x24 works well above desks and in hallways.
For Events and Promotions
18x24 and 24x36 are the most cost-effective sizes for event flyers and promotional posters. They are compatible with standard poster display hardware and are offered by virtually every print shop.
For Professional Presentations
36x48 in landscape orientation is the safest choice for academic and corporate poster presentations. It fits most standard poster boards and is large enough to be read from a few feet away.
For Retail and Commercial
Match the display hardware. Standard poster frames and lightbox displays are built around 24x36 and 22x28 sizes. For banner stands, check the specific retractable unit dimensions before designing.
Frequently Asked Questions
What is the standard movie poster size?
The standard movie poster size is 27x40 inches (686x1016 mm), known as a one-sheet. This has been the industry standard for theatrical release posters in the United States since the 1980s.
What size is a standard academic conference poster?
The most common academic conference poster size is 36x48 inches (914x1219 mm) in landscape orientation. Some conferences also accept 42x60 inches or the ISO A0 size (841x1189 mm). Always check your conference guidelines before printing.
What resolution do I need for a poster?
For posters viewed from 3 feet or closer, use 300 DPI. For larger posters viewed from further away (such as 36x48 and above), 150-200 DPI produces acceptable quality. A 24x36 poster at 300 DPI requires 7200x10800 pixels.
What is the difference between US poster sizes and ISO poster sizes?
US poster sizes use inch-based dimensions (e.g., 18x24, 24x36) and do not follow a mathematical scaling system. ISO poster sizes (A1, A2, A3) use the metric system and each size is exactly half the area of the next larger size, maintaining a consistent 1:1.414 aspect ratio.
What poster size should I use for a retail store display?
For retail window displays, 24x36 inches is the most common size. For in-store point-of-purchase displays, 18x24 or 22x28 inches are standard. For large-format retail signage, 36x48 or 40x60 inches are used.