Reference · Updated June 2026

Standard Picture Frame Sizes: The Complete Chart

Every standard US frame size, the standard pre-cut mat combinations, and the ISO A-series paper sizes converted to inches — in three tables you can reference before you buy a frame, print, or mat.

By the Austin Gallery editors · June 13, 2026

The most common US frame sizes are 4×6, 5×7, 8×10, 11×14, 16×20, and 24×36 inches — and the single most useful rule is that a mat lets a smaller print fit a larger standard frame, so you can frame an 8×10 in an 11×14 frame with a 2-inch mat. That one trick is why standard sizes go so far: you rarely need a frame cut to your exact artwork. Below are the three tables that answer almost every framing question — US sizes, standard mat openings, and the international A-series in inches.

Standard US frame sizes

These are the off-the-shelf sizes you'll find at any framing aisle or online retailer in the United States, listed in inches with the use each size is built around. Width is given first, then height, the way frames are conventionally labeled — though every one of these is sold in both portrait and landscape.

Standard US framing sizes. Sizes are nominal frame dimensions (the artwork opening), expressed width × height in inches. 8.5×11 matches US letter paper; 27×40 is the standard US movie-poster “one-sheet.”

Buy a standard frame size whenever you can — custom framing costs several times more than a ready-made standard frame, which is why printing or trimming your art to land on one of the sizes above is the cheapest framing decision you can make. We break down the actual numbers in our custom framing cost guide.

Why matting matters — and the standard combinations

A mat is the bordered card that sits between your print and the frame, with a window cut to reveal the artwork. Its quiet superpower is sizing: because the mat fills the gap, a smaller print fits cleanly inside a larger standard frame. A mat lets a smaller print fit a larger standard frame — an 8×10 print sits perfectly in an 11×14 frame with a 2-inch mat. These are the standard pre-cut mat combinations sold alongside the frames above.

Standard pre-cut mat combinations. Mat openings are cut slightly smaller than the print (usually about 0.25 in on each side) so the mat overlaps and holds the edges — so an 11×14 mat opening for an 8×10 print shows roughly a 7.5×9.5 in window. Borders are approximate and vary by manufacturer.

US frame sizes are not proportional to each other, so “scaling up” a photo usually means re-matting, not just a bigger frame. A 4×6 is a 2:3 ratio, an 8×10 is 4:5, and an 11×14 is closer to 4:5 again — none of them is a clean multiple of the last. That mismatch is exactly what the mat absorbs: you choose a frame for the wall, then pick the mat opening that fits the print.

Gear we'd reach for

Standard frames and mats that fit the sizes above. Affiliate links — we may earn a commission, at no cost to you.

upsimples 18×24 Picture Frame with 16×20 MatA standard 18×24 frame with the pre-cut 16×20 mat already in it — the matting trick, ready to go.View on Amazon →Golden State Art Acid-Free Pre-Cut 8×10 Mat (25-Pack)Pre-cut 8×10 mats that drop an 8×10 frame down to a clean 5×7 opening.View on Amazon →USTARAIL DIY Solid Wood Canvas Frame Kit (16×20)A standard-size 16×20 DIY kit for finishing a print without paying for custom framing.View on Amazon →

Photo vs art vs poster sizes

The sizes split into three families. Photo sizes — 4×6, 5×7, 8×10 — descend from old print-lab standards and are the smallest. Art and gallery sizes — 11×14, 16×20, 18×24, 20×24 — are where most prints and original work land. Then there are posters, which follow their own conventions entirely. Poster and movie-poster sizes (24×36 and 27×40) are their own standards — don't assume art-print frames fit them. The 24×36 is the dominant commercial poster size; 27×40 is the US theatrical one-sheet, and a frame built for one will not fit the other.

ISO A-series (international) in inches

Prints from outside the US — and most home printers' “A4” setting — use the ISO 216 A-series, defined in millimeters. Each step down the series is exactly half the area of the one above, which is elegant on paper and inconvenient at a US frame counter. Here are the common A-sizes with their exact millimeter definitions and the inch equivalents (millimeters divided by 25.4).

ISO 216 A-series. Millimeter figures are the official ISO definitions; inch values are converted (mm ÷ 25.4) and rounded to one decimal place. Note A4 (8.3×11.7) is close to — but not the same as — US letter (8.5×11).

A-series paper sizes (A4, A3, A2) are common for prints from outside the US and rarely match US frames — measure before buying. An A4 print is slightly narrower and taller than US letter, so it won't sit right in an 8.5×11 frame; the clean fix is to mat the A-size print into the next US frame up rather than hunting for an A-size frame in an American store.

How to choose a size that's cheap to frame

The whole game is landing on a standard size before you spend on framing. If you're printing your own work, set the print to one of the US sizes in the first table — 8×10, 11×14, and 16×20 have the widest, cheapest selection of ready-made frames and pre-cut mats. If your art is an odd size, don't order a custom frame first; buy the next standard frame up and let a standard mat bridge the gap. For sizing art to a specific wall rather than a specific frame, our guide to what size art to hang on a wall covers the proportions, and a quality DIY framing kit turns a standard size into a finished piece for a fraction of custom-shop pricing.

Common mistakes

The expensive mistake is buying or commissioning art in a nonstandard size — a 13×19, a 9×12, an A3 — and only thinking about the frame afterward. There's no off-the-shelf frame for it, so you're pushed into custom framing at several times the cost. The second mistake is assuming a bigger frame is just a scaled-up version of a smaller one; it isn't, because the standard sizes have different aspect ratios. And the third is forgetting the mat math: a mat opening is cut a hair smaller than the print so it can hold the edges, so always size the opening to the print, not the print to the opening.

The bottom line

Memorize six numbers — 4×6, 5×7, 8×10, 11×14, 16×20, 24×36 — and you can frame almost anything off the shelf; a mat handles the rest. The cheapest frame is the one you don't have to have made: print to a standard size, let a standard mat bridge any gap, and save the custom-framing budget for the one piece that truly earns it.

Frame dimensions reflect standard US framing sizes; A-series figures follow the ISO 216 international paper standard, converted to inches (mm ÷ 25.4) and rounded to one decimal place. Mat combinations are the conventional pre-cut sizes; exact mat borders vary by manufacturer. Compiled by the Austin Gallery editors, June 2026. Austin Gallery may earn a commission from links on this page at no cost to you.