Measure the full width and height of the paper, edge to edge, to choose a frame for an unmatted picture. If the picture is already in a mat you want to keep, measure the outside of that mat instead. The size of the printed image, the opening in a mat, and the outside of a decorative frame are different measurements.
That distinction solves the most common framing mix-up: an 8 × 10 print can sit inside an 11 × 14 mat, which then fits an 11 × 14 nominal frame. The finished frame will be larger on the wall than either of those measurements.
What should you measure first?
Place an ordinary loose print on a clean, flat surface. Use a ruler with a clear zero mark and measure horizontally across the full paper, then vertically from top to bottom. Keep the ruler straight rather than measuring diagonally. Do not force a brittle or tightly curled original flat.
Write the result as width × height, followed by the unit. For example, “8 inches wide × 10 inches high, portrait” is clearer than a bare “8 × 10.” Record the actual measurement before rounding anything to a familiar frame size.
Include white paper borders in the physical paper measurement. A print advertised by its image size may arrive on a larger sheet. Level Frames’ measurement instructions make this paper-edge-to-paper-edge distinction and explain that the frame maker then makes its own fitting adjustments.
What size frame do you need without a mat?
For a conventional ready-made frame, look for the size of picture it is designed to hold. An 8 × 10 frame generally describes the insert size, not an exterior that measures exactly 8 × 10. Check the listing, because product descriptions can show both.
Do not add an arbitrary allowance to your picture measurement when ordering a custom frame. Follow that maker’s instructions about precision and fitting clearance. Also check how much the frame’s front lip will cover: fitting the whole sheet inside does not mean every millimeter of its edge will remain visible.
What changes when you use a mat?
A mat has two important sizes: its outer dimensions, which fit inside the frame, and its window opening, which reveals the picture. If you are keeping an existing mat, its outer size is the starting point for the frame order. Frames By Mail’s measuring guide distinguishes an already-matted picture from a loose one.
Suppose your paper measures 8 × 10 inches and the mat’s outside measures 11 × 14 inches. You would look for a frame designed to accept the 11 × 14 mat. You would not choose an 8 × 10 frame simply because that is the size of the hidden paper.
The mat window usually overlaps the paper slightly. As an illustration, an overlap of ⅛ inch on each edge reduces both full dimensions by ¼ inch. An 8 × 10 sheet would then have a 7¾ × 9¾ visible window. That is example arithmetic, not a universal cutting specification.
Should you subtract the overlap before ordering?
Only if the order form tells you to. Some frame designers ask for the actual artwork dimensions and calculate the overlap automatically. Others ask for the finished mat-window dimensions. Confusing those fields can make the opening smaller than intended.
For example, American Frame’s measuring guide describes automatic mat overlap in its designer. If you subtract first and the designer subtracts again, you have counted the overlap twice. Read the final window dimensions in the order summary before paying.
Keep separate notes labeled “paper size,” “mat outer size,” and “desired visible window.” If a signature, edition number, or important detail is close to an edge, say exactly what must stay visible rather than assuming the standard window will show it.
What if you already own the frame?
Start with its label or product information. If it can be opened safely, compare the insert or backing dimensions with your picture or mat. The decorative outside edge and the smaller opening visible from the front are not reliable substitutes for the insert size.
Check depth as well as width and height. A frame that fits one thin print may not accommodate a thicker combination of glazing, mat, artwork, and backing. Do not force the retaining clips closed on an overfilled frame. Ask the maker or a framer about its usable depth.
For wall planning, use the frame’s exterior dimensions. Those depend on the molding and chosen configuration. American Frame’s exterior-size help page shows why the completed configuration has a separate overall measurement.
How do you avoid hiding borders or damaging an original?
Before buying, mark the desired visible area on a separate sketch or a copy of the picture. Do not draw measuring lines on the original. A paper border may be intentional, and cropping a signature to suit a standard frame can be an expensive mistake.
For an irreplaceable photograph, fit is only one part of framing. The Library of Congress recommends keeping the photograph away from the glazing using a mat or spacers and choosing contact materials that pass the photographic activity test. It also suggests displaying a copy of valuable photographs, since even UV-filtering glazing does not eliminate light damage.
Stretched canvas, textiles, and float-mounted artwork need different depth and mounting decisions. Treat this guide as a starting point for flat paper pictures, and ask a qualified framer before altering a valuable or fragile piece.
A quick check before you order
Confirm the actual paper size, whether a mat is included, the mat’s outer size and finished window, and the frame’s usable depth. Check the units and orientation, then reread what each measurement box is asking for.
The simplest rule is to measure what must fit inside the frame, then separately check what will remain visible. Keeping those two questions apart prevents most avoidable sizing mistakes.
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