Standard picture frame sizes

How to read this frame-size chart

A frame’s size is the size of the picture it holds — not the size of the frame itself. An 8×10 frame fits an 8×10 print; the outside of the moulding is larger and varies by style. So a shop listing a “16×20 frame” means the opening (the rabbet) measures about 16 by 20 inches.

That’s also why a frame can hold a smaller print. Drop an 8×10 photo into an 11×14 frame and add a mat — the border that fills the gap — and it looks deliberate rather than lost. The aspect-ratio column helps you judge this: a print and frame that share a ratio (say 4:5) crop cleanly, while mismatched shapes leave uneven margins.

Sizes are written width × height, but they’re interchangeable by orientation: an 8×10 frame is the same as a 10×8, just turned. Ready-made frames come in exactly these sizes; anything in between is a custom (or “non-standard”) frame and costs more.

Worked example: matting an 8×10 in an 11×14 frame

Say you have an 8×10 print and an 11×14 frame. To mat it, you cut a window ¼ inch smaller than the print on every side, so the mat overlaps the edges and the photo can’t slip through. That gives a 7½ × 9½ inch opening.

The borders are what’s left between the opening and the frame: 1¾ inches on the left and right, and 2¼ inches top and bottom. Many framers add the extra at the bottom on purpose — “bottom-weighting” — so the picture sits optically centered. Run your own numbers in the mat border calculator, or test any pairing with will it fit.

Common mistakes

• Confusing frame size with outside size. The listed size is the picture opening; the moulding adds an inch or more all around. Measure your wall space against the outside, not the frame size.
• Assuming 8×10 equals A4. They’re close but not equal — A4 is 8.27 × 11.69 inches, a taller shape. See the international frame sizes chart for the metric equivalents.
• Buying a frame the exact size of your print when you want a mat. If you’d like a border, buy a larger frame (or a pre-cut mat) — an 11×14 frame is the usual choice for an 8×10 photo.

The most popular sizes

For photos, 4×6 covers everyday snapshots, 5×7 suits small portraits and cards, and 8×10 is the classic portrait and certificate size. Step up to 11×14 and 16×20 for art prints and gallery walls.

Posters cluster at 18×24, 24×36 and the 22×28 one-sheet. Square frames — 8×8, 10×10 and 12×12 — fit album art, scrapbook pages and social-media prints. If you’re matting any of these, the standard mat sizes chart shows the matching openings.

What if your print isn’t a standard size?

Plenty of prints fall between the sizes in the chart — a 12×18 enlargement, a 13×19 inkjet print, a cropped phone photo. No shop stocks a frame for those, but you don’t need one: buy the next standard size up and let a custom-cut mat bridge the gap.

Take a 12×18 print. The smallest standard frame it fits inside is a 16×20. Cut the mat window ¼″ smaller than the print on each side — an 11½ × 17½″ opening — and the borders land at 2¼″ on the sides and 1¼″ top and bottom. Want a fuller, even border instead? Step up to an 18×24 and the same print gets a generous 3¼″ all the way around.

Test any pairing first with will it fit, then size the bridging mat in the mat border calculator. The same trick rescues a print that’s smaller than every frame — a wide mat makes it look deliberate, and a ready-made pre-cut mat often saves you cutting one.