What Size Is a 5×7 Frame? | The Opening, Not the Outside

A 5×7 frame is sized to hold a 5-inch by 7-inch print, with the dimensions referring to the inside opening rather than the outer edge.

That distinction matters more than it seems. When a frame is labeled 5×7, the measurement almost always describes the space where the photo sits—not the finished size of the frame itself. The moulding, matting, and backing all add inches around that opening. So a 5×7 frame can look much larger on your wall than the photo inside it.

Knowing this one detail settles most buying confusion: measure your print first, then match the frame’s opening to that size. For a true 5×7 print, you want a frame with a 5×7 opening. Many listings, however, advertise the overall dimensions, which can make a smaller frame look bigger than it is.

What the 5×7 Measurement Actually Means

In U.S. framing, the stated size refers to the inside dimensions of the frame—the opening where the photo rests. Frame size guides from sources like Frame Destination and Frameology confirm this convention: a “5×7” frame holds a 5×7 print. The metric equivalent for that opening is 12.7 × 17.8 cm, or 127 × 178 mm.

The aspect ratio is 5:7 in portrait orientation, or 7:5 when you turn it landscape. Either way, the physical opening stays the same; only the photo’s orientation changes.

Why the Outside Size Differs So Much

Retail listings show dramatic variation in finished dimensions for the same nominal 5×7 opening. The moulding—the decorative border around the frame—accounts for most of the difference. A thin metal frame might measure 6.5 by 8.5 inches overall, while a chunky solid-wood frame runs closer to 7.5 by 9.5 inches.

Some real-world examples make this concrete:

• Frameamo lists a 5×7 frame with outer dimensions of 7.5″ x 9.5″ and a 1.5″ border.
• Bed Bath & Beyond shows a 5×7 solid-wood frame at 6.75 x 8.75 inches overall, with a 1.75-inch moulding width.
• Target sells a marble tabletop 5×7 frame whose overall footprint is 9.49 by 7.41 inches.
• Amazon listings commonly cite finished sizes like 6.25″ x 8.25″ or 6.5″ x 8.5″ for 5×7 frames.

The lesson: if a listing only shows outer dimensions, that number tells you nothing about whether your print fits. Look for the “image size” or “opening” specification, not the overall measurement.

Matting Changes the Visible Area

If you plan to use a mat, the visible portion of your photo shrinks. A mat is the cardboard border that sits between the print and the glass, and its opening is smaller than the frame’s to hold the photo in place.

The mat overlaps the print edges slightly to keep it secure.

If the full 5×7 image must remain visible edge-to-edge, check the frame’s stated display area or rabbet overlap before buying. Most frames cover a thin margin of the print by design.

Common Mistakes to Avoid

Three errors trip up most buyers:

• Confusing frame size with outer size. A 5×7 frame is not 5 inches by 7 inches on the outside—that’s the opening. The finished frame is always larger.
• Buying a matted 5×7 frame for a 4×6 print. Matted frames often hold a smaller photo than the frame’s nominal size.
• Mixing up 5×7 and 7×5. These are the same physical size, just different orientations. In common usage, 5×7 means portrait and 7×5 means landscape—but the opening is identical.

Frame the step simply: measure your print’s height and width in inches, then match that to the frame’s opening size. When the print is exactly 5 by 7 inches, a 5×7 frame is what you need. If a quality 5×7 frame for your print is what you’re after, compare options that state their opening dimensions plainly before you buy.