Poster Size Planner

What this tool does

Tell the planner how far away the audience will stand and how much content the poster carries. It recommends an ISO A-size (A0–A3), a maximum readable font size in points, and the headline size needed to be legible at that distance. Useful for events, classrooms, retail, and trade shows.

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Plan Poster Size, Font Size, and Tiled Printing at Any Viewing Distance

Work out the right ISO A-size, readable font size, and headline scale for a poster given the distance it will be viewed from and how much content it carries.

Enter a viewing distance in metres and a rough content density (sparse, medium, or dense) and the planner recommends a paper size from A0 to A3, a maximum readable body font size in points, and a suggested headline size. It also advises when tiled home-printer output is a reasonable alternative to a commercial wide-format print.

The planner is aimed at graphic designers producing event or trade-show posters, self-publishers putting together book-launch artwork, print-shop owners advising on readability, and home users who want a DIY poster that actually works across the room.

Why use a poster size planner?

Posters fail most often because they were designed at arm's length on a laptop and then hung on a wall three metres away. The body text becomes unreadable, the headline looks timid, and the whole composition feels empty. Use this planner for:

conference and academic posters
trade-show and exhibition stands
school and classroom displays
retail window graphics
event and gig promotion
book launch and cover reveal artwork
DIY tiled posters printed on A4 or US Letter

It helps you choose the right ISO A-size before you start the design, rather than scaling up a small artwork and hoping the text holds up.

What you can customise

The planner offers the settings needed to fit almost any display situation:

Viewing distance, in metres or feet
Content density: sparse headline, medium, or dense academic
Target audience: standing, seated, or passing
Preferred orientation: portrait or landscape
Paper size system: ISO A-series or US Arch/Engineering
Tiled-print mode: calculate the number of A4 or US Letter sheets needed for a larger poster

It returns a recommended A0, A1, A2, or A3 size, the body and headline font sizes in points, and the tile count for home-printer output.

Notes and limitations

Readability depends on font choice and weight as well as point size. Sans-serif fonts at a given size read slightly better at distance than serif fonts.
The planner assumes good lighting. Reduce the recommended distance for dim interiors and outdoor evening events.
Wide-format printers typically stop at A0 or B0. For anything larger, consider panel prints joined with a bleed strip.
Tiled-print mode produces visible seams; laminating the finished poster can hide them.
US equivalents — Tabloid (11 x 17 in), Arch B (12 x 18), Arch C (18 x 24), Arch D (24 x 36) — map approximately to A3, between A3 and A2, A2, and A1 respectively.

Who this planner is for

This tool supports anyone who needs to decide poster size and type scale before committing to a print run.

Graphic designers

Make size and type decisions defensible to clients with a clear readability calculation, rather than relying on eyeballed judgement.

Self-publishers

Produce shop-window posters, book launch artwork, and convention banners that actually pull the eye from distance.

Print-shop owners

Advise customers who arrive with an A4 design and expect it to work on an A1 print — walk them through a sensible upscale path.

Home users

Plan school-project posters, community notices, and party signage that remain readable across a hall or across a garden fence.

Size options and when to use them

A3 (297 x 420 mm)

Suitable for close-range reading at 1 to 1.5 metres — noticeboards, coffee shops, and small event listings. US equivalent is Tabloid.

A2 (420 x 594 mm)

The workhorse of academic and conference posters, viewed at 1.5 to 2.5 metres. Fits most portable display stands.

A1 (594 x 841 mm)

For 2 to 3 metre viewing — retail window displays, trade-show backdrops, and gig posters on busy streets.

A0 (841 x 1189 mm)

For 3 metre and longer sightlines — exhibition halls, auditoriums, and dense academic posters where reviewers may read several panels in sequence.

How to use the tool

Estimate the viewing distance for the space where the poster will hang.
Pick a content density that reflects how much text the poster carries.
Select a paper size system: ISO A-series or US Arch.
Choose portrait or landscape orientation.
Read the recommended size, body font size, and headline size.
If you want to print at home, switch on tiled-print mode to see how many A4 or US Letter sheets will be needed.
Design at the full size in your layout software and export as a PDF.

Worked example

Say you are producing a conference poster that will be read from about 2 metres by passing delegates, with dense academic content and multiple charts. The planner recommends A1 portrait with 28-point body text, 12-point caption text, and a 96-point headline. Two metres divided by the rough rule of two to three millimetres of cap height per metre of viewing distance gives around 5 to 6 mm of cap height — roughly 28 points in a typical sans-serif face.

For a shop window poster viewed from three metres, the planner shifts to A0 portrait with 48-point body text and a 144-point headline.

Methodology

The planner uses a readability rule of roughly 25 to 30 centimetres of poster height per metre of viewing distance for glance-readable layouts, adjusted one size up for dense content and one size down for sparse. Font size is derived from a 2 to 3 millimetre cap-height rule per metre of viewing distance, then translated to points. Tiled-print counts are derived from dividing the chosen poster size by the A4 or US Letter printable area, rounded up.

Helpful preset ideas

A3 at 1 m for noticeboards and A-frame signage
A2 at 2 m for academic conference posters
A1 at 2.5 m for retail and gig posters
A0 at 3 m+ for exhibition halls
Tiled A4 x 4 for a quick home-printed A2 mock-up

Best ways to design a readable poster

Set body text at the size the planner recommends, even if it looks oversized on a laptop.
Use a strong hierarchy — headline, subheads, body — with each step at roughly 1.5 to 2 times the size of the next.
Keep line length to about 40 to 60 characters for comfortable reading at distance.
Pick sans-serif fonts for outdoor and fast-glance posters; serif is fine for reading-length academic content.
Design in CMYK and export at 150 DPI for large-format — 300 DPI only matters at arm's length.

If in doubt, print a single A4 tile and tape it to the wall at the planned distance as a quick sanity check.

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FAQs

Quick answers

How is recommended poster size calculated?

Viewing distance drives readability: roughly 25–30 cm of poster height per metre of viewing distance keeps a glance-readable layout. Dense content also pushes the size up by one step.

What font size is readable on a poster?

A practical rule is 2–3 mm of cap height per metre of viewing distance for body text — about 24 pt at 1 m, 48 pt at 2 m, and so on. Headlines should be 3–4× that size.

When should I pick A0 over A1?

Choose A0 when the audience reads from 3 m or more, or when you have dense diagrams, charts, or multiple paragraphs. Single-headline event posters often work fine at A1.

Should I print in portrait or landscape?

Portrait is the default for ISO A sizes — most poster boards and easels are taller than they are wide. Switch to landscape for infographics or panoramic images.

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