11.7 x 16.5 inches is the rounded imperial equivalent of A3, an international paper size that measures exactly 297 x 420 mm (11.69 x 16.54 inches), commonly used for posters, prints, and wall art.
A listing that reads “11.7 x 16.5” is almost always pointing at A3 — the international paper standard that sits between US Letter and Tabloid in scale. That matters because A3 isn’t a US size at all, and the difference between a frame’s outer dimensions and the space your artwork actually fills is where most buyers get tripped up.
This guide covers the exact numbers, the orientation swaps sellers use, and how to measure your print so the frame you order actually fits.
What Is 11.7 x 16.5 In Millimeters And Inches?
A3 measures exactly 297 x 420 mm, which converts to 11.69 x 16.54 inches — the figure sellers round to 11.7 x 16.5 for convenience.
The half-inch rounding is harmless on a spec sheet but worth knowing when you’re matching a frame to a print. The table below lays out the conversions side by side.
| Measurement | Exact Value | Common Listing Form |
|---|---|---|
| Metric (mm) | 297 x 420 mm | 297 x 420 mm |
| Imperial (exact) | 11.69 x 16.54 in | 11.69 x 16.54 in |
| Imperial (rounded) | 11.7 x 16.5 in | 11.7 x 16.5 in |
| Portrait orientation | 11.7 wide x 16.5 tall | 11.7 x 16.5 |
| Landscape orientation | 16.5 wide x 11.7 tall | 16.5 x 11.7 |
| US equivalent | Between Letter and Tabloid | Not a US standard |
| Typical insert use | Posters and wall art | A3 print |
One note on that last row: A3 is an international standard, not a US Letter, legal, or tabloid size. If you’re printing at home, check your printer’s supported paper list before assuming A3 will feed through it.
Why The Orientation Swap Confuses Buyers
Sellers list A3 as either 11.7 x 16.5 or 16.5 x 11.7 depending on which way the frame hangs, and both describe the same frame — just rotated.
Portrait prints use 11.7 wide by 16.5 tall. Landscape prints flip those numbers. The physical frame is identical either way; only the listing order changes. If a product page says “16.5 x 11.7,” read the product photos before assuming it won’t fit your vertical poster.
Frame Opening vs. Artwork Size: The Measurement That Matters
Most frame complaints trace back to one mistake — measuring the outer frame instead of the visible image area. The moulding and any mat reduce the space your artwork actually occupies.
Before ordering, work through these checks:
- Measure the visible artwork, not the outer paper edge, if your print has a border you plan to cover.
- Confirm whether the listing describes the frame opening or the insert size — some list “A3” as the intended insert, others list outer frame dimensions.
- Check the mat opening if you’re buying a matted frame. Mat openings are cut slightly smaller than the image so the print sits securely.
- Trim unwanted borders first, then measure again before you buy.
For wall placement, leave visible wall space around the frame on all sides rather than butting it against a corner or trim. A framed A3 anchors a gallery wall well when it has breathing room.
If you’re ready to skip the guesswork, our tested roundup of the best 11.7×16.5 frames for A3 prints covers which listings match their stated dimensions.
What 11.7 x 16.5 Looks Like Next To Common US Sizes
A3 is roughly 68% of a US Tabloid sheet and considerably larger than Letter, which is why US buyers often mistake A3 prints for oversized posters.
US Letter measures 8.5 x 11 inches and Tabloid measures 11 x 17 inches. Tabloid sits close to A3 but isn’t identical — an 11 x 17 frame will leave a small gap around a true A3 print, and an A3 frame will crowd a Tabloid sheet. The A3 spec is published by Papersizes.org’s A3 reference, and the format’s background and standard uses are described by Adobe’s A3 format overview.
This mismatch is the single most common cause of a “doesn’t fit” return. Verify the size you have against these numbers before ordering.
The Bottom Line On This Frame Size
If your print is a true A3, buy an A3 frame and you’re done. The 11.7 x 16.5 figure you’ll see in listings is that same size with the decimal rounded, and orientation is the only variable — flip the numbers and the frame is unchanged.
Measure the visible image area before you order, confirm the listing refers to the insert size rather than the outer frame, and account for any mat. Get those three right and the frame fits the print the first time.
FAQs
Is 11.7 x 16.5 the same as A3?
Yes, but not to the decimal. A3 measures exactly 297 x 420 mm, or 11.69 x 16.54 inches. The 11.7 x 16.5 figure is a rounded version used by sellers for simplicity. A frame described either way is intended for an A3 insert.
Will an 11.7 x 16.5 frame hold a US Tabloid print?
No, not cleanly. Tabloid measures 11 x 17 inches, while A3 is 11.7 x 16.5 inches. The widths and heights differ enough that a Tabloid print won’t fit an A3 frame without trimming, and an A3 print will sit loose inside a Tabloid frame.
Should I measure my artwork or the paper it’s printed on?
Measure the visible image area if any border will be hidden by the frame or mat. That visible area is what has to match the frame opening, not the outer paper edge. If the borders should stay visible, measure the full sheet instead and size up accordingly.
References & Sources
- Papersizes.org. “A3 Size” Confirms the exact A3 dimensions of 297 x 420 mm.
- Adobe. “A3 Format” Describes A3 as an international paper size used for posters and prints.
