European Poster Sizes: A Complete Guide

Europe runs on ISO standards. If you’re printing for the EU market or comparing European formats to US sizes, here’s everything you need to know about A0, A1, A2, and the full series.

We run campaigns across the US every week. Street-level poster work in New York, Chicago, Los Angeles, Atlanta. But a chunk of our clients ship goods and run brand activations in Europe. When they ask about European poster sizes, they’re usually surprised by how different the system is from what they’re used to stateside.

The short version: Europe uses the ISO 216 standard. It’s a mathematical system built around a consistent ratio. Every size in the series folds exactly in half to produce the next size down. That makes production and distribution predictable in a way that the US system simply isn’t.

This guide covers all the major European poster sizes in millimeters, centimeters, and inches. We’ll explain how they stack up against American formats, where each size gets used in practice, and what you need to know before you print.

The ISO 216 Standard: Why European Sizes Work the Way They Do

The ISO 216 standard was adopted across most of Europe in the 1970s and 1980s. It’s based on a simple mathematical principle: every sheet has an aspect ratio of 1 to the square root of 2, which is approximately 1:1.414. This means when you cut a sheet in half along its longer side, the two halves each have exactly the same proportions as the original sheet.

The practical result is a nested set of sizes. A0 is the largest in the A-series. A1 is exactly half of A0. A2 is exactly half of A1. And so on down to A10, which is barely bigger than a postage stamp. For posters specifically, you’ll mostly deal with A0 through A3.

The system also includes B-series sizes, which fall in between the A-series sizes. B0 is bigger than A0. B1 sits between A0 and A1. The B-series gets used for posters and banners when the A-series sizes don’t quite fit the space.

Outside of the ISO standard, Europe also has some traditional national sizes that show up in certain industries. The French Colombier and Grand format, the German DIN sizes, and various advertising industry formats that predated the ISO standard all still appear in print and outdoor advertising contexts. We’ll cover the most common ones.

European Poster Sizes: Full A-Series Chart

Here are the ISO A-series sizes most relevant to poster production, in millimeters, centimeters, and inches:

A0 is the workhorse for large-format European poster campaigns. You’ll see A0 posters in London tube stations, Paris Metro corridors, Berlin U-Bahn platforms, and on hoardings across European cities. It’s roughly equivalent to a US 24×36, though not an exact match.

A1 is the most common size for retail window displays and event posters. If you walk past a pub or a cinema in the UK and see a promotional poster in the window, it’s almost certainly A1.

A2 gets used heavily in point-of-sale displays, pharmacy windows, and smaller retail environments. A3 is essentially the European equivalent of the US tabloid sheet, and it shows up everywhere from coffee shop menus to school notice boards.

European B-Series Poster Sizes

The B-series fills in the gaps between A-series sizes. B-series sheets are slightly larger than the corresponding A-series sheet. B1, for instance, sits between A0 and A1 in area. These sizes appear less often in everyday poster production but are common in specific outdoor advertising formats.

B1 in particular is worth knowing. A lot of European outdoor advertising is sized in B1 or multiples of B1. When you see posters stacked four-wide across a hoarding in Amsterdam or Madrid, each individual panel is often B1.

Key fact: A0 measures 841 x 1189 mm (about 33 x 47 inches). The US standard 24×36 measures 610 x 914 mm. An A0 poster is larger than a 24×36 in both dimensions. If you’re adapting artwork from US to European formats, plan for the size difference.

Traditional European Advertising Poster Sizes

Before the ISO standard took over, Europe had a patchwork of national and trade-specific poster sizes. Many of these still appear in outdoor advertising contracts and legacy print runs. Knowing them helps when you’re working with European partners or looking at older advertising spaces.

UK Quad and Double Crown

The British advertising industry developed its own set of poster sizes that predate ISO 216. The Double Crown measures 20 x 30 inches (508 x 762 mm). The Quad Crown doubles that to 40 x 30 inches (1016 x 762 mm). These sizes were standard for UK cinema and theater advertising through most of the twentieth century and are still used in some contexts today.

The UK 4-Sheet, 16-Sheet, and 48-Sheet

British outdoor advertising uses a sheet-counting system similar to the US. A 4-sheet poster is 40 x 60 inches (1016 x 1524 mm). A 16-sheet is 80 x 120 inches. A 48-sheet is the UK equivalent of a US billboard at 120 x 240 inches. These formats appear on bus shelters, rail station platforms, and roadside hoardings across the UK.

The French Grande Format and Colombier

French printing historically used the Colombier size at approximately 63 x 90 cm (24.8 x 35.4 inches), and the Grand Format at 55 x 73 cm. Paris Metro advertising originally developed around these legacy sizes. Modern Paris Metro advertising has largely moved to ISO formats, but you’ll still see references to these older dimensions in print trade contexts.

German DIN A and Campaign Formats

Germany adopted the DIN 476 standard in 1922, which later became ISO 216. DIN A sizes are identical to ISO A sizes. German outdoor advertising also uses the City Light format at 118.5 x 175 cm, which you’ll see in illuminated display cases at U-Bahn and S-Bahn stations across Frankfurt, Munich, Hamburg, and Berlin.

How European Sizes Compare to US Standard Poster Sizes

US posters don’t follow the ISO standard. American printing developed around different paper sizes, and US standard poster dimensions are measured in inches rather than millimeters. The closest matches aren’t exact, which matters when you’re adapting artwork.

The US 18×24 inch poster is the closest match to A2, but the dimensions don’t line up exactly. If you’re designing artwork intended for both US and European printing, you’ll need to account for the difference. Most designers add safe margins and set up separate print-ready files for each market.

Design tip: When adapting a US 24×36 design to European A1 (23.4 x 33.1 in), the A1 is narrower and shorter than a 24×36. Your artwork will need slight cropping or repositioning. Don’t just resize the whole image or you’ll change the proportions.

Where European Poster Sizes Show Up in Practice

We’ve placed posters across the US and worked with partners in European markets. Here’s where the different sizes actually appear in the wild.

Transit Advertising in Major European Cities

The London Underground uses a combination of 4-sheet (40×60 in) and 16-sheet (80×120 in) formats. Paris Metro uses primarily A0 and custom formats specific to their station infrastructure. Berlin U-Bahn uses the City Light format (118.5 x 175 cm) in its illuminated cases and A0 format for plain paste-up locations.

Retail Window Displays

A1 dominates European retail windows. Walk past any high street in London, Dublin, Copenhagen, or Amsterdam, and the window promotional displays are almost universally A1. Some retailers use A0 for flagship locations where they want more visual impact.

Music and Event Posters

European concert and event promotion uses A2 and A1 for most venue and street-level work. Fly posting in UK cities typically uses A1 sheets. Festival promotion in Germany and France often uses A0 for primary campaign materials. These are mounted on hoardings and building facades in high-footfall areas.

Exhibition and Gallery Work

Museum and gallery promotion across Europe uses A0, A1, and B1 extensively. Exhibition posters on the London Underground, Paris Metro, and Berlin S-Bahn systems are often A0 or close to it. Gallery window displays are typically A1 or A2.

Printing European Sizes in the US

If you’re based in the US and need to print European sizes, most large-format print shops can handle ISO dimensions without issue. The key is to set up your document at the correct millimeter dimensions from the start. Don’t design at US letter and then try to export to A4 size, because the proportions are different and your design will not lay out correctly.

For A0 and A1 printing in the US, you’ll need a large-format print vendor. Most sign shops and commercial print houses that handle wide-format work can print to ISO A-series dimensions. Give them the dimensions in millimeters to avoid any confusion with inch-based templates.

Paper stock is another consideration. ISO A-series sizes are designed around specific paper dimensions. If you’re printing A0 in the US using American paper stock, the printer may need to trim the sheet after printing. This is usually fine, but confirm the setup with your vendor before committing to a large run.

Resolution requirements are the same regardless of the measurement system. For large-format posters viewed from a distance of 3 feet or more, 150 DPI is usually sufficient. For close-viewing materials like A4 and A3, 300 DPI is standard. Set your document resolution before you start designing, not after.

Setting Up Files for European Poster Sizes: A Practical Guide

Getting the file setup right is where most European poster size errors happen. Here is the workflow that prevents the most common mistakes.

Always work in millimeters, not inches, when designing for ISO sizes. Most professional design applications let you set the ruler and document units independently. When working on an A1 poster, set your document units to millimeters and create the page at 594 by 841 millimeters. Working in millimeters eliminates the rounding errors that appear when you try to convert between systems mid-project.

Add bleed at the file creation stage. European print vendors typically specify 3mm bleed on all sides for most poster formats. Some specify 5mm for large format work. Confirm with your specific vendor before setting bleed. In InDesign and Illustrator, you can set document bleed when creating a new file. In Photoshop, create the document at bleed-included dimensions and mark the trim boundaries with guides.

Color profile matters for European printing. European print vendors commonly use ISO Coated v2 (ECI) as their standard CMYK color profile, rather than the US Sheetfed Coated or US Web Coated profiles more common in American workflows. If your work will be printed by a European vendor, convert your document to ISO Coated v2 before final export. This ensures the color output matches your design intent as closely as possible on European printing equipment.

Export as PDF/X-1a or PDF/X-4 with embedded fonts. Both European and American professional print vendors typically require PDF/X format with all fonts embedded and all colors set to CMYK or spot. PDF/X-1a is the safer choice for compatibility across older RIP systems. PDF/X-4 supports transparency and is required for designs that use transparency effects. Ask your vendor which they prefer before exporting.

Proofing is more important for transatlantic print jobs. If you are designing in the US and printing in Europe, or vice versa, request a printed proof before approving the full run. Color calibration differences between European and American printing equipment can produce visible color shifts, particularly in skin tones and complex color gradients. A proof confirms that the output matches the design before you commit to a full production run across an ocean.

FAQ: European Poster Sizes

By Livy Phillips, American Guerrilla Marketing. We run street-level poster campaigns across New York, Los Angeles, Chicago, and nationwide. Questions about print specs or campaign planning? We’re happy to talk through the details.

Frequently Asked Questions