Poster-Größenrechner

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.

Example Page Counts

A small 2x2 poster on A4 or Letter paper is a good test project: it uses four sheets, is easy to trim, and shows whether your printer keeps scale accurately. A 3x3 or 3x4 layout works well for classroom signs, party posters, and photo walls. For A0-style wall prints, expect roughly 4x4 A4 pages after margins and overlap are removed from the printable area.

The calculator uses printable area rather than the full paper size. That matters because most home printers cannot print to the physical edge of the sheet. If you add a 10 mm overlap, each joined edge also gives up a small amount of visible width so the pages can sit on top of one another cleanly.

How to Choose a Practical Grid

Start with the wall space and the image resolution. A wide landscape photo often looks best at 3 or 4 pages wide, while a portrait poster may need more rows than columns. If the page count becomes very high, check the effective DPI in the main poster tool before printing. Large grids require more pixels and more assembly time.

If two grid options are close, choose the smaller one for photos and the larger one for bold graphics or event signs. Photos reveal blur more easily; signs with large text can tolerate lower detail because they are viewed from farther away.

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.

Common Calculator Mistakes

Do not calculate a poster from full paper dimensions and then print with normal printer margins; the final size will be smaller than expected. Do not switch from A4 to Letter after generating the PDF. And when printing, keep the PDF at 100% scale so the physical tile size matches the calculator result.