Picture Frame Sizes Explained | Choosing The Right Fit

A frame labeled 8×10 holds an 8-inch by 10-inch image or mat opening, not the outer edge of the frame itself.

For the full breakdown, see our best 6X6 Picture Frame guide.

In the U.S., frame sizes always refer to the inside dimensions — the opening your picture or mat fits into. The outer frame will be larger by an inch or more depending on molding width. Here is how to measure, match, and avoid common mistakes.

What The Listed Size Actually Means

A 5×7 frame holds a 5-inch by 7-inch image. Outer dimensions are larger by about one to two inches, depending on molding thickness. This is the most common confusion: buyers measure the outside and think the product is mislabeled. It is not. Always match the frame’s stated size to the image or mat opening. If framing a print with a white border, measure only the visible image area. The inner lip overlaps roughly 1/4 inch on each side — a small margin is normal.

Standard U.S. Picture Frame Sizes

Most U.S. frames follow standard sizes aligned with common photo print ratios like 2:3 and 4:5. Sticking to a standard size saves money and widens options. Common sizes and typical uses:

• 4×6 inches (10×15 cm) — Standard snapshot, perfect for tabletop frames or gallery walls.
• 5×7 inches (13×18 cm) — Common for single portraits or larger snapshots.
• 8×10 inches (20×25 cm) — Most versatile for wall and tabletop; works for certificates and art prints.
• 11×14 inches — Frequently used to mat an 8×10 print for a professional look.
• 16×20 inches — Common for larger art prints, posters, and matted displays.
• 24×36 inches — Standard poster size, suited for movie posters and large wall art.

Pre-made frames in these sizes avoid custom-order expense. For square prints, a 6×6 frame works well for Instagram-style prints.

How To Measure For A Frame

1. Lay the print on a flat surface. Use a ruler or tape measure.
2. Measure the width of the image at its widest point, excluding any white border you don’t want visible behind glass.
3. Measure the height at its tallest point.
4. If using a mat, measure the outside edge of the mat after cutting to your desired opening — that outer measurement tells you the frame size.
5. Match to the nearest standard size. If your size doesn’t exist, buy the next size up and use a mat to center artwork.

A mat adapts a smaller print to a larger standard frame. For example, an 8×10 print fits into an 11×14 frame with a 2-inch mat border on each side — a classic affordable method.

Common Mistakes To Avoid

• Measuring the molding instead of the opening. Outer frame width doesn’t help. Always check the stated inside measurement.
• Forgetting the mat changes the frame size. A 4×6 print in a mat needs a frame fitting the mat’s outer edge, not the print.
• Ignoring inner lip overlap. About 1/4 inch of the image edge is hidden. If text or detail is at the edge, allow extra space with a mat.
• Assuming metric and inch sizes are interchangeable. An 8×10 inch frame is 20×25 cm; a 10×15 cm frame is 4×6 inches. Always buy in your image’s measurement system.

For most home displays, standard sizes keep costs low. For unusual dimensions, a custom frame shop can cut to any size, but expect a higher price and longer wait.