What Are the Measurements of a Poster Board?

The standard poster board in the US is 22×28 inches. Here’s the full breakdown of every poster board measurement, what each size is used for, and how they relate to professional print campaigns.

The standard poster board in the US is 22×28 inches. Here’s the full breakdown of every poster board measurement, what each size is used for, and how they relate to professional print campaigns.

What are the measurements of a poster board? The most common answer in the United States is 22 inches wide by 28 inches tall. That’s the standard sold at office supply stores, craft stores, and school supply sections across the country.

But poster board comes in more than one size, and the term “poster board” covers a range of physical substrates from thin cardboard to stiff foam core. The measurements vary by brand, material, and intended use.

We work on the commercial poster side of this world. Our campaigns involve professionally printed posters on large-format equipment, not handmade poster boards. But clients ask about poster board measurements often enough, and the confusion between poster boards and printed campaign posters is real enough, that this guide covers both thoroughly.

Standard Poster Board Measurements: 22×28 Inches

The standard poster board in the United States is 22 inches wide by 28 inches tall. This is the dimension you’ll find at Staples, Office Depot, Target, Walmart, Michaels, and every other major retail chain that carries school or office supplies.

At 22×28, the board is 616 square inches, or roughly 4.28 square feet. It’s wide enough for a title and several sections of information. It’s tall enough to display charts, photos, or drawings at readable scale from 4 to 8 feet away.

The 22×28 dimension fits neatly on a standard school desk surface (typically 24×30 inches or larger). That functional fit is one of the reasons the size became standardized for school use. Students can work on the board directly at their desk during project preparation.

Standard Poster Board Measurements (US): 22 inches wide x 28 inches tall. Area: 616 square inches (4.28 sq ft). This is the size sold in most retail packs and used for school projects, science fairs, and basic office signage.

All Poster Board Measurements: Complete Size Chart

Beyond the standard 22×28, poster boards are available in several other measurements. Here’s the full range.

Poster Board Measurements by Material Type

The measurements of a poster board can vary slightly by material. Here’s how the most common types differ.

Cardboard Poster Board

Cardboard poster board is the thin, lightweight board sold in packs at retail. It’s 2 to 4 ply cardboard, typically 0.02 to 0.04 inches thick. The surface is smooth and white (or colored) on at least one side.

Standard measurements: 22×28 inches. Some retailers also carry 14×22 (smaller) and 24×36 (larger) in cardboard. The thin nature of cardboard board means it bends and warps easily if not handled carefully. It’s a short-term interior use product.

Foam Core Poster Board

Foam core has a rigid foam interior between two thin coated paper surfaces. Standard foam core thickness is 3/16 inch (approximately 5mm). Thicker 1/2-inch foam core is available for applications requiring more rigidity.

Standard foam core measurements: 20×30 inches (the most common consumer foam core size), 24×36, and 32×40. Full-sheet foam core at 48×96 inches (4×8 feet) is used by professionals and ordered through specialty suppliers.

Gatorboard

Gatorboard has a harder, more durable surface over a denser foam interior. It’s used for professional display applications. Measurements typically mirror foam core: 20×30, 24×36, 32×40. It’s heavier than standard foam core and resists moisture and impact better.

Corrugated Board

Corrugated poster board is similar to corrugated cardboard (like a shipping box) but with a smoother exterior surface. It’s rigid, lightweight, and often used for outdoor signage that needs to be weather-resistant for short periods. Measurements vary; 22×28 is a common size for corrugated retail display boards.

How Poster Board Measurements Compare to Printed Advertising Posters

The confusion between “poster board” and “printed poster” is widespread. Here’s a clear side-by-side comparison of measurements and purpose.

A 22×28 poster board and a 24×36 printed poster are close in area but completely different products. The poster board is bought blank and decorated by hand. The printed poster comes from a press or large-format printer with the design already on it. Different products, different uses, different costs.

Tri-Fold Poster Board Measurements

Tri-fold poster boards are popular for science fairs and professional table displays. They unfold to a larger display area than a flat board while remaining compact when closed for transport.

The most common tri-fold poster board measurements when fully open are 36×48 inches, 48×36 inches, or 36×72 inches. When folded, they’re approximately 12×48 inches or 12×36 inches, compact enough to fit in a standard backpack or carry case.

Tri-fold panels typically have a wide center section (usually 22 to 24 inches wide) with two narrower side panels (each 12 to 14 inches wide). The center section holds the main content; the side panels hold supporting sections like abstract, methods, or additional data.

For school science fairs, the 36×48 tri-fold open dimension is the most common requirement. Always check the event’s specified dimension limits before purchasing or building a tri-fold display.

Tri-Fold Note: Tri-fold poster boards are measured by their fully open dimensions, not their folded dimensions. A “36×48 tri-fold” is 36 inches tall by 48 inches wide when fully open and displayed. When shopping, verify whether the listed size is folded or unfolded.

How Poster Board Measurements Are Used in Commercial Settings

Even in professional commercial settings, poster board measurements matter. Here’s where our team encounters them.

Trade Shows

Trade show displays at venues like the Jacob K. Javits Center in New York or McCormick Place in Chicago often use rigid foam core panels as mounting surfaces for printed graphics. Standard trade show panel sizes typically run 24×36 or 24×48 inches, matching standard foam core and gatorboard dimensions.

For a 10×10-foot trade show booth, a typical panel configuration might use three to four 24×36 panels arranged side by side to create a 72 to 96-inch wide graphic wall. The panels are mounted to the booth structure using hardware sized to fit the standard foam core thickness (3/16 inch).

Retail Point-of-Sale Displays

Retail display hardware, the metal and plastic stands you see near the register or in store aisles, is often sized to hold standard poster board measurements. A 22×28 board insert fits standard display stands sold by retail supply companies. Knowing this standard measurement means you can produce insert boards that fit existing hardware without custom manufacturing.

Event Signage

For events at venues in neighborhoods like the Arts District in Los Angeles or Tribeca in New York, directional and informational signage is often produced on foam core boards in standard measurements: 22×28 for most signs, 24×36 for larger directional signs. These fit portable easels without custom cutting.

Frequently Asked Questions