September 12, 2026
The dimensions of a standard poster board in the United States are 22 x 28 inches. That is the size sold at mass retailers, office supply stores, and craft chains across the country. It is the default format for school science fairs, community presentations, and retail counter displays. This is the answer most people are looking for when they search this question.
But poster board is a category, not a single product. Foam core, cardboard, gatorboard, and other rigid substrates all fall under the “poster board” label and come in multiple standard dimensions. The 22 x 28 is the most common retail size, but it is not the only standard. Knowing the full range prevents the frustrating experience of ordering a poster board that does not fit your print or your display hardware.
This guide covers every standard poster board dimension, explains where each size applies, and explains the critical difference between poster board dimensions and standard printed poster dimensions. These are not the same thing, and mixing them up wastes print budget.
The 22 x 28 inch format is the standard poster board size in the US retail market. It is 1.83 feet wide by 2.33 feet tall. Here is why this specific dimension became standard:
The 22 x 28 format cuts efficiently from parent sheets in the paper and board manufacturing process. A 28 x 44 inch parent sheet yields exactly two 22 x 28 sheets with no waste. The size also aligns with standard retail display hardware that was designed around this format, creating a self-reinforcing cycle where the format stays standard because the infrastructure supports it.
For school projects, community presentations, and retail display applications, the 22 x 28 is the standard that display hardware, product shelving, and shipping packaging all accommodate. It is the default choice whenever you need a poster board without a specific technical requirement driving a different selection.
Key Distinction: The standard poster board size (22 x 28 inches) is different from the standard printed poster size (24 x 36 inches). These are not interchangeable. A 24 x 36 poster will not fit flat on a 22 x 28 board.
Less common but available at some retail channels. This size is used for small counter displays and point-of-sale applications. It is a vertical-oriented format that fits in narrow display spaces. Some fast food and retail counter display systems are built for this size.
The most common poster board dimension in the US. Available at virtually every mass retailer. This is the size for school projects, community events, and small business retail displays. Both foam core and cardboard versions are widely stocked. Comes in portrait (22 wide x 28 tall) and environment (28 wide x 22 tall) configurations. The portrait version is more common in retail packs.
The 20 x 30 format is a common art supply and professional presentation standard. It is larger than the retail 22 x 28 but similarly proportioned. Art supply stores stock foam core at this size in both 3/16 inch and 1/2 inch thicknesses. Trade show presenters, photographers, and designers commonly use this format for portfolio displays and presentation panels.
This is the foam core and gatorboard size that matches the primary standard printed poster size. If you want to mount a 24 x 36 inch printed poster on a rigid board, buy 24 x 36 foam core. The edges will be flush. Available at art supply stores and professional display vendors. Not commonly stocked at mass retailers. Expect to order this size from a specialty supplier or art supply chain.
Used for photography prints and gallery display applications. The 30 x 40 format fits many standard gallery frames and is used for large print display at art fairs, trade shows, and professional presentations. This size is above the retail standard and requires art supply or professional display vendor sourcing.
At three by four feet, this is the entry point for truly large format rigid board display. Used for trade show booth walls, event directional signage, and large retail installations. This format requires easels or custom mounting hardware. It is not typically stocked at retail channels. Professional display vendors and sign supply companies carry this format.
The 4 x 8 foot full sheet is the largest standard rigid substrate in the display and signage industry. This is the standard for trade show system panels, large exhibition installations, and architectural display applications. It comes in foam core, gatorboard, PVC foam, and aluminum composite materials. Not a retail product. Available through professional display vendors and sign supply distributors.
| Type / Size | Dimensions (in) | Dimensions (cm) | Where to Buy | Primary Use |
|---|---|---|---|---|
| Small Retail Board | 14 x 22 | 35.6 x 55.9 | Some mass retailers | Counter displays, small POS |
| Standard Retail Board | 22 x 28 | 55.9 x 71.1 | Walmart, Target, Staples, craft stores | School projects, community events, small retail |
| Professional Board | 20 x 30 | 50.8 x 76.2 | Art supply stores | Presentations, portfolio, trade shows |
| Poster-Match Board | 24 x 36 | 61 x 91.4 | Art supply, display vendors | Mounting 24×36 printed posters, displays |
| Gallery Board | 30 x 40 | 76.2 x 101.6 | Art supply, photo labs | Photography, gallery display |
| Large Format Board | 36 x 48 | 91.4 x 121.9 | Display vendors, sign supply | Trade shows, events, large retail |
| Full Sheet Substrate | 48 x 96 | 121.9 x 243.8 | Professional display suppliers | Exhibition walls, large installations |
That’s where most confusion originates. The standard printed poster size (24 x 36 inches) and the standard retail poster board size (22 x 28 inches) do not match. They have completely independent histories and supply chains.
Printed posters evolved from paper printing industry standards. The 24 x 36 format aligns with paper roll widths and printing press configurations in the commercial printing industry.
Poster board evolved from the office and school supply industry. The 22 x 28 format aligns with paper and board cutting efficiency and retail display hardware in the consumer products sector.
These two industries developed their standards independently. The result is two “standard” formats that do not align with each other. Anyone trying to mount a 24 x 36 printed poster on a 22 x 28 board will discover this the hard way.
The solution is simple: before printing or before buying boards, decide which dimension you need and order both the board and the print to match. If you need a 24 x 36 printed poster on a rigid board, order 24 x 36 foam core. If you need a 22 x 28 retail board for a hand-written or directly-printed display, do not order a 24 x 36 print to go with it.
Ordering Rule: Decide on the board size first. Then order the printed poster to match the board. Or decide on the print size first, then order the board to match the print. Never order one without knowing the other’s dimensions.
The trifold poster board is a specific format used primarily in school science fairs, trade shows, and community event displays. It consists of three connected panels that fold inward for storage and transport and open flat to create a freestanding display surface.
The standard trifold poster board opens to approximately 36 x 48 inches when fully extended. In its folded configuration, the center panel is 24 inches wide and the two side panels are 12 inches wide each, all at 48 inches tall. Some trifold formats use different panel proportions, but 36 x 48 (open) is the most common standard.
Trifold boards are available in cardboard at retail chains (Walmart, Target, Staples) and in foam core from art supply stores. The cardboard versions are inexpensive and disposable. Foam core trifolds are more durable and present a more professional appearance.
The right poster board dimension depends on the display hardware, the printed content, and the intended environment. Here is a quick decision guide:
School science fair: 22 x 28 single panel or 36 x 48 trifold. Check the school guidelines. Most specify one of these two formats. The trifold is more common for science fair presentations because it is freestanding and provides more display surface.
Retail point-of-sale display: Match the board to the display hardware. Measure the counter card holder or display frame before ordering. The most common retail display hardware accommodates 22 x 28. Confirm before ordering.
Trade show tabletop display: 20 x 30 or 24 x 36 on an easel, or a trifold for self-standing use. The 20 x 30 and 24 x 36 on single-panel foam core with an easel looks cleaner than a trifold for most professional presentations.
Event directional signage: 24 x 36 or 36 x 48, depending on the venue scale. Place on easels at key wayfinding points. Use heavier foam core (1/2 inch) for stability if the event is in a high-traffic or high-air-movement environment.
Indoor marketing campaign: Use 24 x 36 foam core as a backing for 24 x 36 printed posters for clean, professional presentations in premium retail or event environments. The rigid backing elevates the presentation compared to paper posters mounted with tape.
The right poster board dimensions depend heavily on the application. Here is how the major application types drive dimension decisions.
The 22×28 inch retail standard was running by the school project market. Science fair tri-fold boards (22×28 folded, which opens to approximately 22×84) are the most commonly purchased poster boards in the US by volume. This format is so associated with classroom use that asking for a standard poster board at a retail store will almost always produce a 22×28 in a retail pack. For educators and students, the 22×28 is the default and should remain so. It fits standard display hardware and storage solutions designed for educational settings.
Professional event signage uses foam core at 20×30, 24×36, or 30×40 depending on the display environment. These are not available at general retail stores. They come from art supply shops, professional sign companies, and online display vendors. A conference or trade show setting typically specifies easel card dimensions at 22×28 or 24×36. Always verify with the venue’s specification sheet before producing materials, as display hardware may be standardized to a specific size that does not accommodate alternatives without trimming.
For brand activation environments where rigid signage is needed, 24×36 foam core is the standard. It matches the dimensions of most printed large-format campaign materials. Brand activations using easel-back displays typically use 24×36 as the primary size. Counter-top A-frame displays use smaller formats, typically 8.5×11 or 11×17, which are available from standard office supply channels. Event environments with multiple signage placements typically use a hierarchy of sizes: 24×36 for primary informational signs, 11×17 for directional and supplemental signs.
Retail point-of-sale signage on rigid board uses the 18×24 or 22×28 dimension for floor stand and easel placements. Counter and shelf displays use 8.5×11 and 11×14 formats. The right dimension is determined by the specific display hardware in the retail environment. Most major retail chains standardize their POS display hardware to specific dimensions, and signage must be produced to match those dimensions exactly. Confirm the POS hardware specifications with your retail partner before producing materials.
The most common standard poster board dimension in US retail is 22 x 28 inches. Art supply stores also stock 20 x 30 and 24 x 36. Large format boards at 36 x 48 and full sheet 48 x 96 are available from professional display vendors. The right size depends on your specific application and any display hardware requirements.
The standard retail poster board is 22 x 28 inches. The standard printed marketing poster is 24 x 36 inches. These are different products in different size categories. For mounting a standard 24 x 36 printed poster on a rigid board, you need 24 x 36 foam core, not the retail 22 x 28 poster board.
Science fair poster boards are typically 22 x 28 inches for single flat panels, or approximately 36 x 48 inches when a trifold board is fully opened. Individual trifold panel widths are usually 12 inches for side panels and 24 inches for the center panel, at 48 inches tall. Check your school’s specific requirements before buying.
The 22 x 28 is the retail standard sold at mass market stores. The 24 x 36 is a larger board size available from art supply stores that matches the standard printed poster size. The 24 x 36 board has approximately 12 percent more surface area in width and 29 percent more in height than the 22 x 28. Use 24 x 36 board when you need to mount a standard printed poster on a rigid backing.
Yes. Both cardboard poster board and foam core can be cut with a sharp utility knife and a metal straightedge. Cardboard cuts easily. Foam core requires multiple scored passes with a fresh blade for clean edges. Cut on a self-healing mat or a large piece of cardboard to protect the surface beneath.
Standard cardboard poster board from retail stores is approximately 1.5 to 2 millimeters thick. Standard foam core at retail and art supply stores is 3/16 inch (approximately 4.76 mm) thick. Heavy-duty foam core is 1/2 inch thick. Gatorboard, a denser professional-grade substrate, also comes in 3/16 and 1/2 inch thicknesses and resists denting better than standard foam core.
For tabletop trade show presentations, 20 x 30 or 24 x 36 inch foam core on an easel works well. For larger booth wall installations, 36 x 48 panels mounted on a frame system or pipe and drape rig are standard. For full booth back walls, 48 x 96 full-sheet substrates printed with graphics and mounted on panel systems are the professional standard.
For more on this, explore our guerrilla marketing services.
For more on this, explore our experiential marketing.
No. Most international markets use ISO A-series paper and board sizes. The closest international equivalent to the US 22 x 28 retail board is the A2 at 420 x 594 mm (approximately 16.5 x 23.4 inches), which is smaller. The closest to the 24 x 36 board is A1 at 594 x 841 mm (approximately 23.4 x 33.1 inches), slightly smaller than the US 24 x 36. Always confirm board dimensions when working with international suppliers.
Ready to Run Your Campaign?
Call us or email us. We’ll tell you exactly what we can do in your market and what it costs.
American Guerrilla Marketing — Los Angeles
Street-level campaigns in Los Angeles and nationwide. Wheatpasting, LED trucks, street teams, and more.
(646) 776-2770
Related Services
Explore similar advertising solutions offered by American Guerrilla Marketing.
September 13, 2026
September 12, 2026
September 12, 2026
September 12, 2026
September 12, 2026
