How Big Is 16 x 20 Frame? | Dimensions That Matter

A 16 × 20 frame is designed for artwork or photos measuring 16 inches wide by 20 inches tall — in metric, that is 406 × 508 mm or roughly 40.6 × 50.8 cm.

If you are staring down a 16 × 20 frame product page and wondering whether it will actually fit your print, you have come to the right place. The label “16 × 20” sounds straightforward, but it carries a few caveats that can turn a quick purchase into a return. The short version: this is a standard US picture frame size, and the 16 × 20 measurement almost always refers to the image opening or supported print size — not the outer dimensions of the frame itself.

The Actual Numbers For A 16 × 20 Frame

A 16 × 20 frame opening measures exactly 16 inches (40.64 cm) across by 20 inches (50.8 cm) tall. That opening is the space where your artwork sits, whether it fills the frame directly or rests behind a mat.

The aspect ratio is 4:5 (or 1.25), so any print or photo you plan to use should match that proportion — otherwise you will end up cropping part of the image or leaving awkward gaps behind the mat.

What “16 × 20” Actually Means On The Product Label

Here is the detail that catches most buyers off guard: the outside measurements of a 16 × 20 frame vary by brand, molding width, and frame style. One wood frame might measure 18.5 × 22.5 inches overall, while a metal frame from a different manufacturer could be 20.5 × 16.5 inches. The number on the box is the image size, not the shelf size.

On top of that, the visible display area can be slightly smaller than the opening. The rabbet — the lip that holds the glass and artwork in place — eats into the viewing space. One sizing guide notes that the actual visible area ends up around 15.5 × 19.5 inches. If your print runs right to the edges, that lip will crop a thin border out of your image.

Using A Mat With A 16 × 20 Frame

Frames this size commonly ship with a mat that accommodates a smaller print. Standard pairings from major retailers include:

• 11 × 14 print: This is the most common mat opening for a 16 × 20 frame. The mat opening is typically 10.5 × 13.5 inches, leaving a generous border around the artwork.
• 12 × 16 print: Some frames use a mat opening of 11.5 × 15.5 inches for a 12 × 16 image.

If you are buying the frame specifically for a 16 × 20 print, confirm whether the product includes a mat at all and whether that mat actually opens to 16 × 20. Many 16 × 20 frames sold at retailers like Target and Amazon ship with a mat cut for 11 × 14, intended for the framed-with-mat look. If you want the full 16 × 20 display, you may need to order a version that comes “no mat” or remove the included mat yourself.

Before You Buy: Three Quick Checks

Measure your artwork first. If it is exactly 16 × 20, you need a frame labeled for that size without a mat or with a mat that opens fully. If your print is smaller, the frame’s included mat should match it — an 11 × 14 print needs a mat opening close to 10.5 × 13.5, and a 12 × 16 print needs roughly 11.5 × 15.5.

Check the depth listed on the product page if you are framing something thicker than a standard poster — canvas, foam board, or layered artwork.

If you are ready to pick one up, our roundup of the best 16 × 20 black frames covers the top options with their actual outer dimensions and mat configurations, so you know exactly what you are getting before checkout.