---
title: 'Poster Sizes: How to Choose Between A2, A1, 18 × 24, 24 × 36 and the 27 × 40 Movie Poster｜Work Back from Viewing Distance'
url: https://joelin.cc/en/p/9742
source: https://joelin.cc/en/p/9742
lang: en
pubDate: '2026-10-19'
date_modified: '2026-10-19'
description: 'Posters have no single standard: A2 or 18 × 24 in indoors, A1, A0 or 24 × 36 in at events, 27 × 40 in movie one-sheets. Choose by viewing distance.'
author: joe
ai_role: ai_only
translation_of: /p/9742
mentions:
  - name: One-sheet (movie poster)
    sameAs:
      - https://www.wikidata.org/wiki/Q7093592
---

# Poster Sizes: How to Choose Between A2, A1, 18 × 24, 24 × 36 and the 27 × 40 Movie Poster｜Work Back from Viewing Distance

Most posters end up in one of two size bands: A2 or A1 where the ISO A series is used, and 18 × 24 in or 24 × 36 in in the US. But this question really should not start with the size.

Unlike business cards or postcards, posters have no international standard of their own. What gets called a poster borrows its size from one of three different places: the ISO A series of paper sizes (or, in the US, common inch sizes such as 11 × 17, 18 × 24, and 24 × 36 in), the film industry's own format, and the dimensions of display stands. So "what size is a poster" has no single answer. First decide which kind you mean.

The most common poster mistake is not choosing the wrong size. It is choosing a size first and only then thinking about where the viewer will stand. Do it in that order and the text ends up too small.

## The short answer: common situations and the sizes that fit

| What you are making | Recommended size | Why |
| --- | --- | --- |
| Indoor notices, club announcements, in-store signs | A2 ([specs](/en/p/9612)), or 18 × 24 in | Readable from a hallway, printable at any print shop with a large-format printer, lowest cost |
| Trade-show key visuals, event signage, lecture backdrops | A1 ([specs](/en/p/9611)) or A0 ([specs](/en/p/9614)), or 24 × 36 in | Viewers stand 3 m (about 10 ft) or more away, and A2 text is no longer big enough |
| Small notices, tabletop signs, elevator notices | A3 ([specs](/en/p/9609)), or 11 × 17 in | Read up close; anything larger just takes up space |
| Collecting or framing movie posters | 27 × 40 in | The film industry's own format, not part of the A series (see below) |
| Booth displays and stand-up banners | X-banner stand 60 × 160 or 80 × 180 cm | The stand sets the size, not a paper standard |

This table deliberately skips the full dimensions, because you would end up checking each size's page anyway. What matters is the mapping: A2 for indoor, close-range viewing; A1 or larger for distant viewing at events; movie posters are a separate system; and display stands are yet another. Before you look at any numbers, make sure you have picked the right system.

The US inch sizes line up roughly with the A series: 11 × 17 in (Tabloid, 27.9 × 43.2 cm) sits next to A3 (29.7 × 42 cm), 18 × 24 in (45.7 × 61 cm) is a little larger than A2 (42 × 59.4 cm), and 24 × 36 in (61 × 91.4 cm) is a little larger than A1 (59.4 × 84.1 cm). The closest US standard sheet sizes to A0 (84.1 × 118.9 cm) are ANSI E, 34 × 44 in (86.4 × 111.8 cm), and ARCH E, 36 × 48 in (91.4 × 121.9 cm). Because the shapes differ, an A-series design will not fill an inch-size sheet exactly, so pick the system before you start the layout.

![A poster session at an academic conference: portrait A0 posters pinned to display boards along an aisle, with attendees reading them from one or two meters away. The yellow tube on the floor is a poster tube for carrying an A0 poster.](https://image.joelin.cc/cdn-cgi/imagedelivery/0xu8EsaSar9n3zUKY5d7xw/joelin/2026-09/academic-poster-session-a0/hero)

Image source: Copyleft, [CC BY 3.0](https://creativecommons.org/licenses/by/3.0), via [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:2011_international_congress_intensive_care_medicine_paris_posters_science.jpg) (resized). Large academic conferences usually specify A0 for posters (smaller meetings sometimes use A1), and this photo shows why: they have to be read by people walking down an aisle one or two meters away. And the yellow tube on the floor is a poster tube. An A0 poster cannot be folded, only rolled.

## The real method: work back from how far away the viewer stands

The sign industry has a rule of thumb that has been in use for decades: each inch of letter height is readable from about 10 feet away. In metric terms, 1 cm of letter height is readable from about 1.2 m.

But that rule describes the limit of what is still legible, not what is comfortable to read. The sign industry's guidance for comfortable reading is that the comfortable distance is only about 30% to 50% of the maximum readable distance. In other words, for the same letter height, a viewer has to come at least half the distance closer to read it comfortably. A handy figure to remember is that 1 cm of letter height reads comfortably from about 0.5 m.

![Working back to poster letter size: 1 cm of letter height is readable from about 1.2 m. A headline viewed from 3 m away needs 2.5 cm to be barely legible and 5 to 8 cm to be comfortable to read, so A2 is the minimum for any spot viewed from 3 m or more.](https://image.joelin.cc/cdn-cgi/imagedelivery/0xu8EsaSar9n3zUKY5d7xw/joelin/2026-09/poster-size-viewing-distance/hero)

Let's run the numbers once. Suppose the poster hangs in a hallway and most viewers stand 3 m (about 10 ft) away:

- Barely legible: headline letters at least 2.5 cm (about 1 in) tall
- Comfortable to read: headline letters 5 to 8 cm (about 2 to 3 in) tall

Can an A2 poster hold a 6 cm headline? Yes, but once the headline takes up that much height, there is very little room left for body text. So for anything viewed from 3 m or more, A2 is usually the minimum rather than the first choice. That is why trade-show key visuals almost always start at A1.

Keep in mind that this is a rule of thumb, not a regulation. A busy background, poor lighting, and whether viewers approach head-on or pass at an angle all change the real result. Once you have set the letter sizes, the most reliable check is to print the design on A4 or Letter paper and look at it from a proportionally shorter distance.

## Movie posters are a completely different system

The most widely used movie poster format is the one-sheet, which originated in the US film industry and is generally followed in international releases: 27 × 40 in, about 68.6 × 101.6 cm. That has been the format since the mid-1980s. Older posters are more often 27 × 41 in, and you will see both on the collectors' market.

This has a very practical consequence: a one-sheet will not fit in an A1 frame. A1 is 59.4 × 84.1 cm, and a one-sheet is about 9 cm (3.6 in) wider and 17.5 cm (6.9 in) longer, so it does not fit in either direction. If you are framing an original movie poster, look for a dedicated 27 × 40 frame rather than making do with a generic poster frame.

On the other hand, if you are making your own movie-poster-style artwork rather than collecting originals, printing at A1 (or at 24 × 36 in) is usually easier: frames are easy to find and print shops know the size well. Whether to match the one-sheet format depends on whether the piece will one day hang next to real original posters.

## Display stand sizes are set by the stand, not the paper

With X-banner stands and roll-up banners, the stand's dimensions come first and the printed graphic is made to fit:

- X-banner stands: commonly 60 × 160 cm and 80 × 180 cm
- Roll-up (retractable) banners: commonly 80 to 120 cm wide and around 200 cm tall, with some telescoping models adjustable

Actual dimensions vary between manufacturers, and two models both labeled "large" can differ by several centimeters from one shop to another. Always get the manufacturer's template before ordering. Do not design to numbers you found online.

## Where printing it yourself stops: A3 or 11 × 17 in

Before deciding whether to go to a print shop, check whether you can print the poster yourself. The limit here is the physical size of the machine, not your budget:

| Where | Sizes | Maximum |
| --- | --- | --- |
| Office copiers and self-service copy machines | Letter, A4, up to A3 or 11 × 17 in | A3 / 11 × 17 in |
| Large-format print shops | A2 and larger, any size | No practical limit |

![Self-service printing stops at A3: four poster sizes overlaid at true proportions. A0 is 84.1 × 118.9 cm, A1 is 59.4 × 84.1 cm, A2 is 42 × 59.4 cm and A3 is 29.7 × 42 cm. A3 and smaller can be printed on a self-service copier the same day; A2 and larger need a large-format print shop.](https://image.joelin.cc/cdn-cgi/imagedelivery/0xu8EsaSar9n3zUKY5d7xw/joelin/2026-09/poster-size-convenience-store-limit/hero)

Sheet-fed office machines generally stop at A3 or its US neighbor, Tabloid (11 × 17 in). Up to that size, you can print today and have it in your hand within half an hour. From A2 or 18 × 24 in upward, you need a large-format print shop, and both turnaround time and price step up. You also have to choose a material first: the same A1 poster printed on synthetic PP paper, adhesive-backed PVC, or banner fabric differs in both price and where it works best.

![A roll-fed large-format printer of the kind used in print shops. A roll of photo paper hangs below the machine, and several rolls of different printing materials stand to the right. Because it prints from a roll, the length is not limited by standard paper sizes.](https://image.joelin.cc/cdn-cgi/imagedelivery/0xu8EsaSar9n3zUKY5d7xw/joelin/2026-09/large-format-printer-roll/hero)

Image source: Texas State Library and Archives Commission, [CC BY 2.0](https://creativecommons.org/licenses/by/2.0), via [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Large_Format_Printer_for_Public_%26_Staff_Use_%2837866519055%29.jpg) (resized). Large-format machines print from rolls, so the length is not tied to the A series at all; the real limit is the roll width. That is why sheet-fed office machines stop at A3, while large-format print shops can produce any size.

## Why print shops often quote only A1 and A2

Because paper is cut from large parent sheets. Print shops buy full-size parent sheets, and A1 and A2 fall where the cutting is efficient. Other sizes either waste paper or need a separate setup. Parent sheet sizes vary by market and do not always line up neatly with finished A sizes, which is the most common source of crossed wires when talking to a printer.

There is another fork in the road that people often miss. For small quantities, large-format (inkjet) printing has a fixed cost per sheet, so printing one costs about the same per copy as printing ten. Offset printing only makes sense in volume, because the plate-making cost has to be spread across many copies. The crossover point is usually somewhere in the tens of copies and varies between printers. Finding out which route your quantity belongs on matters more than picking the size first.

## How to set up the file

- Add 3 mm of bleed on all four sides (in the US, 1/8 in, about 3 mm, is the usual figure), and keep important text a further 3 to 5 mm inside the trim line as a safe area. Some printers ask for a larger 5 mm bleed on large-format pieces like posters, so follow the printer's file guidelines. For more on bleed, see [What Is Bleed in Printing?](/en/p/9893)
- Use CMYK for files you send to print and RGB for anything viewed on screen. Colors shift between the two, so proof important brand colors with the printer first.
- Resolution is not always 300 DPI. Ordinary print work uses 300 DPI, but because large-format prints are viewed from farther away, most printers accept lower resolutions. Follow the printer's requirements.

Here is how many pixels you actually need for the common sizes (rounded to the nearest pixel). The rule is simple: if nobody will stand within a meter (about 3 ft) and look closely, you do not need 300 DPI.

| Size | Pixels at 150 DPI | Pixels at 300 DPI |
| --- | --- | --- |
| A3 | 1,754 × 2,480 | 3,508 × 4,961 |
| A2 | 2,480 × 3,508 | 4,961 × 7,016 |
| A1 | 3,508 × 4,967 | 7,016 × 9,933 |
| A0 | 4,967 × 7,022 | 9,933 × 14,043 |
| 11 × 17 in | 1,650 × 2,550 | 3,300 × 5,100 |
| 18 × 24 in | 2,700 × 3,600 | 5,400 × 7,200 |
| 24 × 36 in | 3,600 × 5,400 | 7,200 × 10,800 |

For a poster on a wall viewed from two or three meters away, 150 DPI is plenty, and the file is only a quarter the size of a 300 DPI file. Only handouts that people hold and read up close need 300. The industry's recommended range is 100 to 300 DPI, depending on viewing distance and material.

One last thing: the finished piece will be slightly smaller than what you measured on the template. After printing, the bleed is trimmed off along with the strip the press grips the paper by, so you cannot design all the way to the edge of the full sheet. That is a physical limit shared by all printed pieces, not a printer cutting corners.

## Frequently asked questions

### What size is a poster usually?

Where the A series is used, A2 and A1 are the most common. Indoor notices and in-store signs are usually A2, trade-show key visuals and event signage are A1 or A0, and close-range notices like those in elevators or on tabletops only need A3. In the US, 11 × 17, 18 × 24, and 24 × 36 in are the common equivalents. Posters themselves have no international standard size; these numbers are borrowed from paper sizes.

### Should I choose an A1 or an A2 poster?

It depends on how far away the viewer stands. Within 3 m, A2 is usually enough; beyond 3 m, A2 is only the minimum, and starting at A1 is the safer choice. The headline has to grow with distance, and on an A2 sheet, a bigger headline leaves very little room for body text. Measure the distance from the wall to where viewers stand, then work out the headline size using "1 cm of letter height reads comfortably from about 0.5 m."

### Can I put a movie poster in an A1 frame?

No. The most widely used movie poster format, the one-sheet, is 27 × 40 in (about 68.6 × 101.6 cm), and A1 is 59.4 × 84.1 cm. A one-sheet is about 9 cm wider and 17.5 cm longer than A1, so it does not fit in either direction. To frame an original movie poster, you need a dedicated 27 × 40 frame.

### Are X-banner stands the same size as posters?

No. X-banner stands and roll-up banners have sizes set by the stand, commonly 60 × 160 and 80 × 180 cm, which do not line up with the A series. Actual dimensions also vary between manufacturers, and two models both labeled "large" can differ by several centimeters from one shop to another. Get the manufacturer's template before ordering.

### What resolution should a poster file be?

Not always 300 DPI. Ordinary print work uses 300 DPI, but because large-format prints are viewed from farther away, most printers accept lower resolutions; follow the printer's requirements. Before sending the file, add 3 mm of bleed on all four sides, keep important text a further 3 to 5 mm inside as a safe area, and use CMYK color mode.

### Can I print a poster myself? How big can I go?

Yes, but office copiers and self-service copy machines generally stop at A3 or 11 × 17 in. For A2 or 18 × 24 in and larger, you need a large-format print shop, and both turnaround time and price step up.

### Why is my finished poster slightly smaller than my layout?

Because of trimming. After printing, the bleed is cut off along with the strip the press grips the paper by, so the finished piece is always slightly smaller than the full sheet. This physical limit applies to all printed pieces, so do not design all the way to the edge of the full sheet; leave room for bleed.

Keywords: poster sizes, standard poster sizes, common poster sizes, A1 poster size, A2 poster size, 18 × 24 poster, 24 × 36 poster, movie poster size, one-sheet, X-banner stand size, roll-up banner size, poster bleed

Sources: Chinese original first published 2026-09-10; original last updated 2026-10-20. The letter-height and viewing-distance figures are a sign-industry rule of thumb, not a regulation. Banner stand and roll-up banner sizes vary by manufacturer. The US inch sizes are common print sizes, not a poster standard.