Billboard Sizes, and the Scale Artwork Is Drawn At

A 14 × 48 bulletin is not designed at 48 feet. It is drawn at 24 × 7 inches and enlarged. Roadside artwork is supplied at a fraction of finished size — the traditional half-inch-to-the-foot layout — and the printer scales it up on press. That single fact is what most billboard size questions are really asking about, and it is the one most size guides skip.

If you want to see a design on a board rather than in a spec table, the billboard mockup generator warps your artwork onto a real roadside bulletin in perspective.

The standard formats

Finished size is what you buy. Artwork size is what you send. They are not the same number, and the ratio between them changes with the format — the larger the face, the smaller the scale it is drawn at.

Pixel sizes are the artwork size at 300 dpi — the file a printer asks for, not the finished face.

Why artwork is drawn small

At full size a 14 × 48 bulletin is 576 × 168 inches. A 300 dpi file at those dimensions would be about 172,800 pixels wide, which no design application will open and no printer wants. So the trade builds at scale: half an inch on the layout stands for a foot on the board, the file comes out at 24 × 7 inches, and the press enlarges it.

Enlargement is also why effective resolution on a billboard is far lower than it sounds. Nobody is reading a bulletin from two feet away, so the pixels can be enormous by the time they are on the vinyl. Designing at scale keeps the file workable and matches how the whole supply chain talks about the job.

The four inches you lose on every edge

Vinyl is hemmed over the frame, and that takes roughly four inches on each edge of the finished face. Artwork must run into that margin — it bleeds — but nothing that matters may sit there. A logo tucked neatly into the corner of the layout is a logo folded around the back of the board.

At half-inch-to-the-foot scale, four inches of finished size is about a sixth of an inch on your layout. It is small enough to ignore, which is exactly why people do.

Roughly seven words

A bulletin is read at speed, from hundreds of feet, by someone doing something else. The working rule in the trade is about seven words — not a law, but a good check on a layout that has started to fill up. If a headline needs a second clause, the board is the wrong place for it.

The smaller formats invert this. A junior poster is neighborhood-scale and usually at eye level, read from a few feet rather than a few hundred, so it can carry real detail. A bus shelter panel is read by someone standing still, sometimes for several minutes, and rewards detail in a way a roadside board never does.

Confirm with the operator before you send

These are the standard formats, and standard is not universal. Face sizes vary by market, digital resolutions change whenever an operator swaps hardware, and some sites are simply non-standard. Every vendor publishes a spec sheet for the specific board you have bought, and that sheet beats any general guide including this one.

What does not vary much is the shape. A bulletin is roughly 3.4 times as wide as it is tall whatever the face size, which is why a layout that works on a 14 × 48 usually survives being placed on a 10 × 40.

Seeing it in place

A billboard layout looks different at scale, in perspective, next to a road, than it does flat on a screen at 100%. That is the argument for putting it on a board before anyone signs off on it — the billboard mockup generator does that in the browser, and Instagram post sizes covers the same question for the much smaller surface most campaigns also need.