How to Measure for an 18 x 22 Picture Frame: Sizing Guide?

For the full breakdown, see our best 18 X 22 Picture Frame guide.

A print that looks like it should fit often doesn’t, and the reason is almost always the same: the tape measure ran over the white margin instead of the picture. That single mistake is why so many frames get returned.

Measuring for an 18 x 22 picture frame comes down to three numbers — the artwork itself, the mat opening, and the frame’s inside edge — and getting them in the right order takes about two minutes. Below is the measuring order that works, what changes when you add a mat, and which ready-made sizes actually fit.

Measure The Artwork First, Not The Paper

Measure the printed image edge to edge, ignoring any white border, then write both numbers down as width first, height second. Frame sellers label sizes that same way, so 18 x 22 means 18 inches across and 22 inches tall.

Most photo papers and poster prints carry a white margin — sometimes a quarter inch, sometimes an inch or more. Measure to the outside of that margin and your piece reads as several inches larger than the image actually is, which sends you shopping in the wrong size range entirely.

• Lay the artwork flat on a table and press it smooth; a curled corner shortens the reading.
• Measure at the midpoint of each edge, not the corners, where paper often flares.
• Note portrait or landscape before you order or cut anything.

That last point matters more than it sounds. An 18 x 22 piece shown in landscape needs a frame built for a 22-inch horizontal span, and mat openings are cut to match the orientation you choose.

What Size Frame Do You Need With A Mat?

Adding a mat means buying a larger frame, because the mat itself takes up space between the artwork and the frame’s inside edge. Frame Destination’s sizing guide lays the sequence out plainly: artwork size, then mat opening, then inner frame opening, then outer frame size — each step building on the one before it.

The mat opening is cut slightly smaller than the print so the artwork sits behind it and stays put. That overlap is deliberate: it holds the piece flat and hides the edge.

Then you decide mat width. Wider mats push it further. This is where the math usually goes sideways, so work backward from the frame you like rather than forward from the print.

Common Frame Sizes Near 18 x 22

An 18 x 22 is a less-common size in US ready-made frames, so availability shifts by seller and many pieces end up in a custom frame. Frame USA’s size chart lists 18 x 24 and 22 x 28 among standard dimensions, which makes both useful when you’re building a matted presentation around an 18 x 22 print.

If you’d rather skip the guesswork on fit and finish, this roundup of tested 18 x 22 picture frame options covers the models that handle these dimensions cleanly.

Does The Molding Width Change The Number?

Yes, and it’s the variable most people forget. Frame width — the visible face of the molding — changes the outer footprint but never the inside opening, so a chunky 1.5-inch frame and a thin half-inch frame both hold the same artwork while looking completely different on the wall.

There’s also a rabbet to account for: the small lip on the back of the frame that the artwork rests against. Frame Destination describes rabbet overlap as one of the main variables in the final calculation, because the artwork tucks behind it by a fraction of an inch. That overlap is normal and expected — plan the mat opening with it in mind rather than fighting it.

Before You Order, Check These Three Things

Three quick checks catch nearly every sizing error before the frame ships. Run them in order and you won’t need to measure twice.

1. Confirm the artwork measures 18 x 22 with the border excluded, and note whether it presents portrait or landscape.
2. Decide mat or no mat. IKEA’s framing guidance makes the same point: the frame you need depends on whether the picture sits flush or sits behind a mat, and how much of the image you want visible through the opening.
3. Match the frame’s stated inside dimensions to your final number, not the outer size. Retailers list the artwork size a frame holds — a frame labeled 18 x 22 is built for an 18 x 22 print with no trimming.

One retailer’s stated difference of 1/8 inch versus 1/4 inch on mat overlap won’t change which frame you buy, but it does explain why a print sometimes slips slightly in a pre-cut mat. If a piece is valuable or irreplaceable, have the mat cut to your actual measurement rather than trusting a stock opening.