What Is 13×19 Paper Size Called? | Super B And A3+ Explained

13×19 paper is most commonly called Super B in North America and A3+ internationally, and it is not an ISO-standard A3 size.

If you’ve shopped for large-format paper, you’ve likely seen this size listed under several different names and wondered whether they’re all the same thing. Whether you’re printing posters, proofing photographs, or preparing presentation boards, knowing the correct name matters — picking the wrong label in a printer driver can crop your image or force an unwanted scale. The terminology varies by region and vendor, but the three names you’ll encounter most often are Super B, A3+, and the straightforward “13×19.”

Why Does 13×19 Paper Have So Many Names?

13×19 paper sits in an odd spot in the paper-size world. It’s not part of the ISO 216 A-series, which governs standard A3, A4, and related sizes. Sources note explicitly that A3+ and Super A3 are not ISO 216 sizes, which is why you won’t find a single universal label for it on every system.

In North American print and design circles, the term Super B is common. Internationally, A3+ is more widely used. Many office-supply vendors in the U.S. simply list it as 13″ × 19″ copy or printer paper and note that it’s also referred to as Super B. Depending on the software or vendor you’re dealing with, you might also see B+, Tabloid+, or the metric equivalent 330 × 483 mm.

The takeaway: whatever you call it, it’s the same physical sheet. The name just depends on where you are and who’s selling it.

How Does 13×19 Compare To Other Paper Sizes?

One of the most common mix-ups is confusing 13×19 with standard A3. They are not the same size. A3 measures 297 × 420 mm, which is roughly 11.69 × 16.54 inches. That means 13×19 is noticeably larger than A3 in both dimensions — roughly 45% more surface area.

Another frequent point of confusion involves Tabloid paper, also called ANSI B. Tabloid is 11 × 17 inches — a full two inches shorter and two inches narrower than 13×19. If you buy Tabloid expecting 13×19, your print job won’t fit.

Metric conversions of 13×19 vary slightly across sources because vendors round differently. Some list the width as 330 mm, others use 329 mm, and some go to 330.2 mm. All of these refer to the same physical paper; the difference is rounding, not a different product.

Here’s a quick reference for the sizes most often compared with 13×19:

Where Is 13×19 Paper Used And What Printers Support It?

This size is built for work that needs room to breathe. Large-format printing, posters, photographs, presentation boards, engineering drawings, and print proofing are the primary uses. It’s also a favorite for creative print work where standard letter or A4 paper feels too small.

Not every printer can handle 13×19 media. The size is associated with wide-format inkjet and laser printers, plus prosumer desktop models that specifically list 13×19 or A3+ support. Before buying a ream, check your printer’s specifications or media list — if the printer doesn’t accept the size, no driver setting will make it work.

When your printer does support it, look for a paper size setting that explicitly matches “13 × 19,” “A3+,” or “Super B” in the print dialog or driver. Canon’s paper-size guide, for instance, lists A3+ as 329 × 483 mm, confirming the equivalence used by many printer drivers. Selecting the matching setting prevents scaling or clipping, especially for borderless or bleed-heavy layouts.

Because 13×19 is a non-ISO size, some software lists it under custom paper sizes or vendor-specific names rather than one universal label. If your application doesn’t show a direct match, check the custom-size options. For a dependable, tested selection of photo papers that handle this size well, see our roundup of the best 13×19 photo paper options.

What Mistakes Should You Avoid With 13×19 Paper?

The biggest errors are the ones born from name confusion. Users often assume A3+ is an ISO standard, but it isn’t. They mix 13×19 with Tabloid, which is two inches shorter on each side. And some treat the metric conversion as exact to the last millimeter, then panic when a vendor lists 329 mm instead of 330 mm — it’s the same sheet, just rounded differently.

There’s also the compatibility trap. Even if a printer technically supports wide-format paper, paper feed and borderless printing settings can differ by model and region. There is no single universal setting path across all devices, so check your model’s documentation if a print job isn’t coming out as expected.