How to Measure for a 14 x 16 Picture Frame: Sizing and Matting Guide?

A 14 x 16 frame uses a mat opening cut about 1/8 inch smaller than the artwork on every side, then an outer mat sized to the frame’s actual inside rabbet.

Frame labels lie. A 14 x 16 frame is the outside measurement; the usable opening behind the lip is always smaller — which is why mats come back too big, too small, or off-center. The math below comes from standard U.S. framing practice: measure the artwork, subtract the overlap, add the border, and check it against the rabbet before you buy or cut anything.

Start With The Rabbet, Not The Frame Label

The rabbet is the recessed ledge inside the frame that holds the glass, mat, and backing — and it constrains your mat. Measure it with the frame face down and a ruler along the inside edge of that ledge.

A 14 x 16 label describes the outer footprint. The rabbet runs smaller, often by a quarter inch or more per side depending on the molding profile. Size your mat to 14 x 16 while the rabbet measures 13.5 x 15.5 and it will not seat — it will bow, or not fit at all. Measure twice here; every downstream number depends on it.

What Mat Opening Size Does Your Art Need?

Size the mat opening to the image, not the sheet. An unprinted white margin is not part of the artwork, and measuring it throws the opening off by the full width of the border.

The overlap rule protects the edges: the mat should cover at least 1/8 inch of the artwork on all four sides, so the art does not slip through the opening or show a sliver of raw edge. Mat opening = artwork size minus 2 × overlap — a 1/4 inch total reduction in each dimension at the standard 1/8 inch overlap.

• 8 x 10 art, 1/8 inch overlap: opening of 7.75 x 9.75 inches.
• 11 x 14 art, 2 inch border: outer mat lands near 14.5 x 17.5 inches.
• 11 x 14 art, 10.5 x 13.5 opening: the 1/4 inch total reduction in action.

Never cut the opening equal to the artwork size — an exact-size opening lets the piece fall through and exposes every edge.

How Wide Should The Mat Border Be?

There is no single correct border width. Two to two and a half inches is the common starting point, and the wider cited range runs from 1.5 to 3 inches. Border width fills the gap between art and frame, so it scales with the piece: a small print with a 3 inch border can look swallowed, a large one with a 1 inch border looks cramped. Adding 3 to 5 inches to the outside dimension of the photo is a quick way to land on the nearest standard frame size.

The outer mat size is the opening plus the border on each side. Compare that to your measured rabbet — if the mat is larger, take the border down until it fits.

Logan Graphic Products publishes a full guide to measuring mats and sizing frames that walks through the same opening math step by step.

Three Mistakes That Ruin A Mat

• Measuring the paper, not the image. A wide unprinted margin produces an opening far larger than the visible art.
• Cutting the opening to the exact artwork size. Without overlap, the piece slips through or shows its edges.
• Ignoring the rabbet. A mat that is too large will not sit flat, no matter how good the math looked on paper.

Border proportions are a judgment call — art size, visual balance, and frame depth all pull on the final number. Treat the ranges as starting points. One more note: a 14 x 16 frame is sized for a 14 x 16 piece with little room for matting, so if your art is already 14 x 16, a mat means either a very thin border or a larger frame. If you are still choosing, this roundup of tested 14 x 16 picture frames covers which moldings leave enough rabbet depth for a mat plus backing.