The Complete Guide to Horizontal Poster Sizes
Every standard landscape size drawn to scale, the aspect ratio each one carries, the resolution your file needs, and the point where a wide paper poster should become a board instead.
The standard horizontal poster sizes are 11 x 8.5, 17 x 11, 24 x 18, 36 x 24 and 48 x 36 inches, with the width always written first. 36 x 24 is the everyday wall size, 48 x 36 the conference standard, and panoramic cuts like 36 x 12 handle over-door strips. Match your artwork ratio to the size family, 3:2 for camera photos and 4:3 for phone shots, and 4OVER4.COM prints any custom dimension beyond the chart.
Quick answer
Width first, then height, then the ratio family
A horizontal poster is described width first, so 48 x 36 lies down and 36 x 48 stands up. Five standard sizes cover the range from counter card to conference board: 11 x 8.5, 17 x 11, 24 x 18, 36 x 24 and 48 x 36 inches. The sizes split into ratio families, 3:2 sizes take uncropped camera photos and 4:3 sizes take phone shots, and picking inside the right family is what keeps your image from being cropped. Anything the chart misses prints as a custom size in large format.
What Counts as a Horizontal Poster, and When It Wins
A horizontal poster is any poster whose width is greater than its height, and in print sizing the width is always the first number. That convention does real work: 48 x 36 and 36 x 48 use the same sheet, but one is a landscape conference poster and the other is an upright movie-style one-sheet, and the press operator only knows which you meant from the order of the numbers.
Landscape earns its place when the content is wider than it is tall. Timelines, process flows, group photos, panoramas, menu boards read left to right, and a horizontal sheet lets them breathe instead of stacking. It also fits the spaces portrait posters cannot use: above a doorway, along a stair wall, behind a reception desk, across the back of a trade show table. Research posters went horizontal decades ago for a practical reason, three or four columns of figures side by side beat one long scrolling column when people read standing up.
Portrait still wins for a single standing subject, a full-length product shot, and any frame or holder built for upright sheets. If the choice is genuinely open, our landscape versus portrait guide walks the decision, and standard posters print either orientation from the same size list at the same price.
The Horizontal Poster Size Chart
These are the sizes that come up in real orders, with the ratio each one carries and the honest limit of each. Every size is width x height in inches.
| Size (in) | Ratio | Where it works | The limit |
|---|---|---|---|
| 11 x 8.5 | 1.29:1 | Counter cards, bulletin boards, back-of-door notices. | Reads as a flyer past six feet. Do not ask it to carry a wall. |
| 17 x 11 | 1.55:1 | Menu boards, shelf-level retail signs, small event posters. | Body text below 24 pt disappears at distance. |
| 18 x 12 | 3:2 | Uncropped camera photos, small gallery prints. | Same viewing-distance ceiling as 17 x 11. |
| 24 x 18 | 4:3 | Window displays, easels, countertop easel-backs. | Crops a 3:2 photo. Match the family first. |
| 36 x 24 | 3:2 | The wall workhorse: offices, retail, event photography. | Near the width where corner-taped paper starts to bow. |
| 48 x 36 | 4:3 | Conference and research posters, big promo walls. | Ships rolled in a tube; plan a flat board if it must travel often. |
| 36 x 12 | 3:1 | Panoramas, over-door strips, above shelving runs. | Only panoramic artwork fills it; normal photos crop hard. |
If none of these fit the space, measure the wall and order the exact dimension. Large format posters start at $25 and take any custom width and height, and the custom size poster guide shows the order flow step by step.
Aspect Ratios and the Resolution Math That Decides Your Size
Two numbers decide whether a landscape poster prints clean: the aspect ratio of your artwork and the pixel count behind it. Get those right and everything else is preference.
Ratio first. An uncropped photo from almost any interchangeable-lens camera is 3:2, which scales without cropping to 18 x 12, 24 x 16 and 36 x 24. Phone photos are usually 4:3, which maps to 16 x 12, 24 x 18 and 48 x 36. A 16:9 presentation slide is its own family: it fills 48 x 27, and forcing it onto a 48 x 36 sheet leaves either white bars or nine inches of your slide on the cutting room floor. Cross-family orders are the number one reason a proof comes back looking wrong.
Then resolution. The working floor is 150 pixels per inch at the final printed size for posters viewed at arm length, relaxing to about 100 ppi beyond six feet. In practice: a 24 megapixel file at 6000 x 4000 pixels carries 40 x 26.7 inches at 150 ppi, so it covers 36 x 24 with margin. A 1920-pixel-wide web image at 36 inches is 53 ppi and will print soft no matter what the press does. The poster resolution guide works the numbers for every standard size, and the blank template library gives you a correctly sized canvas with bleed already set.
Materials, Mounting and the Any-Size Escape Hatch
Size and material are one decision, not two, because width is what breaks paper. A 24 x 18 paper poster hangs flat with four adhesive strips. A 48 x 36 sheet of the same stock bows away from the wall within days and ripples in any room where the humidity moves.
The practical splits: paper standard posters from $108.75 per run for short-term campaigns and anything hung once. Laminated posters from $25 where hands or cleaning spray touch the print, menus, classrooms, workshop walls. Foam core posters from $49.99 and mounted posters from $39.99 for anything wide, reused between events, or leaned on an easel. Framed posters from $87.86 when the print is staying up for years. And nothing on this page belongs outside: rain and UV are vinyl banner work, from $79. The poster material breakdown compares all of them in one table.
The escape hatch is that none of the chart sizes are a boundary. The large format printing line at 4OVER4.COM prints any custom width and height, so a 60 x 18 strip above shelving or a 40 x 20 panorama gets entered directly into the configurator and priced live. Once it arrives, hang it without putting holes in the deposit, the damage-free hanging guide covers strips, putty and rails by poster weight.
Wally explains horizontal poster sizes
Width first, ratio family second, then the size takes care of itself
Wally reads a poster order the way the press does: the first number is the width, so 48 x 36 lies down and 36 x 48 stands up. Before he prints, he checks the ratio family, a 3:2 camera photo goes to 36 x 24 untouched, a 4:3 phone shot fills 48 x 36, and a 16:9 slide gets 48 x 27 so nothing is cropped away. Hand him a wall measurement the chart does not cover and he enters it as a custom size, because large format takes any width and height.
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Common Questions
Your horizontal poster size questions, answered
What are the standard horizontal poster sizes?
The standard horizontal sizes are 11 x 8.5, 17 x 11, 24 x 18, 36 x 24 and 48 x 36 inches, always width first. They are the familiar portrait poster sizes rotated so the long edge runs sideways. Beyond the core five, 18 x 12 and 24 x 16 matter because they share the 3:2 ratio of an uncropped camera photo, and panoramic cuts like 36 x 12 handle skyline shots and over-door displays.
What is the most common landscape poster size?
For walls, 36 x 24 inches. It is large enough to read across a room, small enough to ship affordably and hang with strips instead of hardware, and its 3:2 ratio matches most photography without cropping. For conference and research work, 48 x 36 is the default because it fills a standard presentation board with room for figures and text columns.
Is a horizontal poster just a vertical file rotated?
No. The artwork has to be designed at the landscape dimensions from the start, with the document page set to the final width and height plus bleed. Rotating a portrait layout sideways leaves the type running up the wall. When you order, enter the width as the first number; a 36 x 24 order and a 24 x 36 order are two different posters. Our guide to landscape versus portrait size covers when each orientation wins.
What resolution do I need for a large horizontal poster?
Aim for 150 pixels per inch at the printed size for anything viewed at arm length, which means a 36 x 24 poster wants roughly 5400 x 3600 pixels. From six feet or more, 100 ppi still looks clean, so the same file can go noticeably larger if it hangs high. What fails is stretching a small web image: a 1920 x 1080 screenshot at 36 inches wide works out to 53 ppi and prints visibly soft.
Can I order a horizontal poster in a custom size?
Yes. Large format printing at 4OVER4.COM runs any custom dimension, so a 40 x 20 gallery print or a 60 x 18 panorama above shelving is a normal order, not a special request. Enter the exact width and height in the configurator and price it live. Custom sizes cost more per square foot than the standard cuts, so if a standard size fits the space, it is the cheaper path.
Should a wide poster be paper, foam core or framed?
Paper is right for short-term display and anything shipped rolled to be hung once. Past about 36 inches wide, or anywhere the poster gets moved between events, foam core from $49.99 or a mounted poster from $39.99 stays flat and reusable. Laminated posters from $25 take fingerprints and cleaning sprays, which suits menus and classrooms. Framed posters from $87.86 are the pick when the print is permanent decor. Paper of any kind does not belong outdoors; that is vinyl banner territory.
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