Billboard Sizes & Types — Every Billboard Format Explained
Walk down any road and you’ll pass half a dozen different “billboards” without noticing they’re different formats. Each type has its own size, purpose, and best use. Understanding them is the first step to buying the right one.
The core formats
Bulletin. The classic highway billboard — 14 feet high by 48 feet wide, about 672 square feet of ad face (per OAAA standards). It’s the largest standard format, built for high-speed viewing, and the default choice for broad reach along highways and commuter routes.
Poster (30-sheet). A smaller roadside format, roughly 12 ft × 24 ft. Placed in urban and suburban areas where audiences move more slowly — good for local awareness with a lighter commitment.
Junior poster (8-sheet). About 6 ft × 12 ft. Street-level, often in pedestrian-heavy areas like shopping districts — designed to be read up close.
Spectacular. Oversized, high-impact displays in landmark locations — commonly 16 ft × 60 ft or 20 ft × 60 ft and up. These dominate their environment (think Times Square) and command premium pricing.
Digital formats
Digital LED billboard. A programmable screen that rotates multiple ads, runs video, and updates remotely. Available in the same size ranges as static boards, but bought by daily spend or per-impression since advertisers share the screen. Digital is the growth engine of the medium — on track to overtake static outdoor in 2026.
3D (anamorphic) billboard. A curved or corner-wrap LED screen using perspective-corrected content to make images appear to leap off the sign. Built for spectacle and social sharing — eye-tracking shows these hold attention for ~4.8 seconds versus ~1.2 seconds for flat ads.
Mobile formats
Mobile / truck billboards. Screens mounted on vehicles that drive through the city. Brings the billboard to your audience — flexible for events, launches, and targeted neighborhoods.
International sizes
Sizes vary by market. In the UK and much of Europe, the common large format is the 48-sheet (about 6.1 m × 3.05 m). Markets have their own standards, which matters when planning international campaigns.
How to choose
Match the format to your goal:
| Goal | Best format |
|---|---|
| Broad highway reach | Bulletin (14×48) |
| Local / urban awareness | Poster or junior poster |
| Landmark “moment” / prestige | Spectacular or 3D |
| Flexibility + measurement | Digital LED |
| Event / targeted presence | Mobile billboard |
Size matters for design
Your creative must be built for the format’s aspect ratio — a 14×48 bulletin is a wide horizontal canvas, a digital screen may be vertical or square. And regardless of size, letter height follows viewing distance: roughly an inch of type for every ten feet of viewing distance, so highway boards need letters several feet tall.
Getting the right format and size
Choosing between a highway bulletin and a city-center spectacular isn’t just about size — it’s about audience, budget, and the message. A good partner matches the format to your goal.
That’s what Globalstars does. We operate billboard inventory across formats — highway LED screens, street-level digital, 3D spectaculars, and world-landmark displays. We help you pick the format and size that fits your campaign, design the creative for it, and handle the placement.
From a regional 14×48 to a Times Square spectacular, [Globalstars has the right billboard for you](https://www.globalstarscn.com/AdvertisingFormats/dooh/).
Data sources: Out of Home Advertising Association of America; industry format guides; eye-tracking research on 3D screens.
