Poster Size Calculator
Find out how many pages you need to print a large poster
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Understanding Poster Sizes
Choosing the right poster size is the first step toward a great large-format print. Standard sizes like A0 (84.1 × 118.9 cm) and A1 (59.4 × 84.1 cm) are widely used for event banners and presentation displays, while North American sizes such as 24" × 36" are popular for movie posters and retail signage.
This calculator tells you exactly how many standard paper sheets you need to tile together to reach your desired poster dimensions. It accounts for the unprintable margin around the edge of each page and an optional overlap between adjacent sheets — so that when you trim and align them, there are no white gaps.
Once you know the page count, head over to the Block Poster tool to upload your image and generate a print-ready PDF in seconds. No software to install — everything runs directly in your browser, so your images stay private.
Tips for the Best Print Quality
- Use a high-resolution image.Aim for at least 150 DPI at the final poster size. For an A0 poster that means an image of roughly 4970 × 7020 px.
- Set overlap to 5–15 mm. This creates a bleed zone on each sheet so you can align pages precisely before trimming off the excess.
- Print on matte photo paper for richer colours and a professional finish, or plain paper for a quick proof.
- Use a craft knife and cutting mat to trim pages cleanly along the overlap lines for seamless assembly.