When it comes to making an impact with visual content, choosing the right poster size is crucial. At 24 Billions, we believe in smart design backed by the right dimensions. Whether it’s for advertising, events, décor, or promotions, our guide will help you choose the ideal poster size for your needs.
Why Poster Size Matters?
The size of a poster influences how it’s viewed, where it’s placed, and how much content it can effectively display. A well-sized poster ensures better visibility, readability, and overall aesthetic appeal.
Common Poster Sizes (in inches & millimeters)
1. Small Posters
Ideal for indoor use or close-up viewing (e.g., notices, small ads, personal décor).
| Name | Inches | Millimeters |
| A5 | 5.8 x 8.3 | 148 x 210 |
| A4 | 8.3 x 11.7 | 210 x 297 |
| A3 | 11.7 x 16.5 | 297 x 420 |
2. Medium Posters
Great for indoor/outdoor events, medium-distance viewing.
| Name | Inches | Millimeters |
| A2 | 16.5 x 23.4 | 420 x 594 |
| 18 x 24 | 18 x 24 | 457 x 610 |
3. Large Posters
Perfect for outdoor advertising, concerts, movie promos, etc.
| Name | Inches | Millimeters |
| A1 | 23.4 x 33.1 | 594 x 841 |
| 24 x 36 | 24 x 36 | 610 x 914 |
4. Extra-Large Posters / Billboards
Best for high-impact marketing campaigns on roadsides or buildings.
| Name | Inches | Millimeters |
| A0 | 33.1 x 46.8 | 841 x 1189 |
| 40 x 60 | 40 x 60 | 1016 x 1524 |
Poster Orientation Options
- Portrait – Traditional and formal; great for informational posters.
- Landscape – Modern and wide layout; suitable for visuals and cinematic displays.
Where to Use Different Sizes?
| Size | Ideal Use Case |
| A5 | Flyers, handouts, small posters (ideal for personal invites or product info) |
| A4 / A3 | Office walls, indoor notices |
| A2 / 18×24 | Shop ads, college events |
| A1 / 24×36 | Event promos, indoor branding |
| A0 / 40×60 | Exhibitions, conferences, billboards |
Tips from 24 Billions Experts
- Always match the poster size to the viewing distance.
- Use high-resolution images to avoid pixelation.
- Include ample white space for a clean, readable look.
- Choose fonts and colors that stand out in the selected size.