Convert poster dimensions between mm, cm, inch, and pixels with accurate DPI calculations.
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Settings & Dimensions
Invalid width
Invalid height
Invalid DPI
Recommended for high-quality printing.
Live Results
210 mm
297 mm
Portrait
1 : 1.414
Pixels (@300 DPI)2480 × 3508 px
Millimeters210 × 297 mm
Centimeters21.0 × 29.7 cm
Inches8.27 × 11.69 in
Multi-DPI Pixel Calculation
DPI
Usage
Pixel Size
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How to Use Poster Size Converter
Choose a preset: Select a standard size from the dropdown (e.g., A4, 24x36 in) or choose "Custom Size".
Enter Dimensions: Input your specific width and height.
Select Unit: Choose between Millimeters (mm), Centimeters (cm), Inches (in), or Pixels (px).
Set DPI: Select the resolution for your project. 300 DPI is standard for print.
View Results: The tool instantly calculates the exact dimensions across all units and previews the aspect ratio.
Copy: Click "Copy Result" to easily paste dimensions into your design software (Photoshop, Illustrator, Canva).
Poster Size Guide
Understanding standard poster sizes can help you choose the right format for your printing needs:
A0 (841 x 1189 mm): Extremely large, used for technical drawings or large event promotions.
A1 (594 x 841 mm): Popular for architectural presentations and large shop displays.
A2 (420 x 594 mm): Medium-large, great for indoor notices and window displays.
A3 (297 x 420 mm): Double the size of A4, perfect for small indoor posters and charts.
A4 (210 x 297 mm): Standard printer paper size, used for flyers and small notices.
24 x 36 inches: The standard "Large Poster" size, commonly used for movie posters and retail displays.
11 x 17 inches: Also known as Ledger or Tabloid, excellent for smaller promotional prints.
Frequently Asked Questions (FAQ)
What is Poster Size Converter?
It is a free online tool to convert poster dimensions between physical units (mm, cm, inch) and digital units (pixels) based on your selected DPI. Everything is calculated instantly on your browser.
How do I convert poster size to pixels?
Simply enter your poster width and height, select the physical unit (like inches or mm), and choose your desired DPI (e.g., 300 for high-quality print). The tool will automatically calculate the pixel dimensions.
What DPI should I use for posters?
For standard high-quality print, 300 DPI is recommended. For larger posters viewed from a distance (like billboards), 150 DPI or even 96 DPI might be sufficient. Screen or web use requires 72 or 96 DPI.
What is A0, A1, and A2 poster size?
A0 is 841 × 1189 mm (33.1 × 46.8 in).
A1 is 594 × 841 mm (23.4 × 33.1 in).
A2 is 420 × 594 mm (16.5 × 23.4 in).
Can I convert mm or inches to pixels?
Yes! The tool automatically uses standard conversion formulas. For inches: pixels = inches × DPI. For millimeters: pixels = (mm / 25.4) × DPI.
What is the difference between physical size and pixel size?
Physical size relates to real-world measurements (mm, cm, inches) used for printing. Pixel size represents the digital resolution needed to achieve that physical size accurately at a specific DPI.