What Size Frame Do You Need for a 16×20 Picture? | Frame Math That Fits

A 16×20 picture fits a 16×20 frame with no mat, but if you want matting, buy a 20×24 frame instead because the mat needs extra border space.

A 16×20 print is a standard size in inches, and the frame opening matches it at 16 x 20 inches when displayed without matting. The catch most buyers hit after checkout: the visible image is smaller than that. Frame lips overlap the print edges by roughly a quarter inch per side, so a 16×20 print in a 16×20 frame actually shows about 15.5 x 19.5 inches of artwork. Knowing this before you order saves you a return.

Does a 16×20 Print Fit a 16×20 Frame?

Yes, a 16×20 print fits a 16×20 frame directly with no mat, and this is the standard pairing. The frame opening is built to accept the full sheet, and the print sits behind the frame lip with the backing board holding it flat.

The visible area, though, shrinks by the overlap. That lip covers a narrow strip on all four sides. One framing guide estimates the visible area lands near 15.5 x 19.5 inches. If your artwork has critical detail running to the edge, plan for that strip to disappear.

Two things to check before ordering a 16×20 frame in this category:

• Print actual dimensions. A “16×20” print sometimes measures 15.75 x 19.75 or has a white border meant to be covered.
• Frame profile depth. A deep frame lip covers more of the image than a shallow gallery profile, and exact fit varies by manufacturer.

What Size Frame Do You Need With a Mat?

With a mat, you need a 20×24 frame — not a 16×20. The mat adds border around the print, and that border has to fit inside the frame too, so the outer frame grows by the mat width on every side.

A 16×20 print matted into a 20×24 frame is the standard combination framers recommend. The mat opening itself stays at 16×20 (or slightly smaller, which holds the print in place), and the extra 2 inches per side carries the mat border.

Mats are not just decoration. They keep the print off the glass, which prevents moisture buildup and ink transfer over time.

That 20×24 figure matters more than people expect. Frame Destination’s dimension guide treats 20×24 as the standard outer frame for a 16×20 print with matting, and 24×30 as the common pick when the mat border runs wide. If you are choosing between white and natural profiles for this look, this tested roundup of 16×20 white frames covers what holds up in person.

The Measurement Mistakes That Cause Returns

Almost every wrong frame purchase traces back to one of two mix-ups: confusing print size with outer frame size, or assuming the visible image equals the print dimensions.

Print size is the paper. Outer frame size is the paper plus mat plus frame molding on all four sides. A 16×20 print needs a 16×20 frame bare, and a 20×24 frame matted — those are different products on the shelf.

Frame Destination’s frame and mat dimensions guide and Shotkit’s picture frame sizes reference both treat 16×20 with no mat as a direct fit, and list 20×24 or 24×30 as the framed sizes once matting enters the picture. That agreement across guides is the pattern to trust.

Measure before you buy:

1. Lay the print flat and measure width and height in inches at the paper edge.
2. Decide mat or no mat. This single choice decides your frame size.
3. For matting, add twice the mat border to each dimension. A 2-inch border turns 16×20 into 20×24.
4. Check the frame listing’s stated opening, not just its nominal size, since profiles differ by maker.

Which Frame Size Should You Buy?

Buy a 16×20 frame for a bare 16×20 print, a 20×24 frame for a matted one, and accept that the visible image runs about a half inch smaller than the paper in each direction.

Run one quick check on the frame listing before checkout:

• Bare display: frame size 16×20, mat opening none, expect ~15.5 x 19.5 inches visible.
• Matted display: frame size 20×24, mat opening 16×20, full print visible inside the mat.
• Wide mat border: frame size 24×30, mat opening 16×20, more wall presence.
• Small print in a big frame: 11×14 print, 16×20 frame, mat opening near 10.5 x 13.5 inches.

Skipping that measurement step is the mistake that fills the returns bin. Measure the print, pick the display style, then order the frame those two answers dictate.