Choosing the right size frame for a 16×20 picture depends on whether you plan to display it with or without a mat — no mat means a 16×20 frame, while a mat typically requires a 20×24 frame to fit the artwork plus the border.
A 16×20 print is a standard U.S. size, but the frame you need hinges on one decision: do you want the image to fill the entire frame opening, or do you want a mat border? Measuring correctly and understanding how frame sizes are labeled prevents buying the wrong size. Most framing mistakes come from measuring the wrong thing or assuming the mat adds nothing to the dimensions.
Are You Framing With or Without a Mat?
The mat is the biggest factor in your frame choice, so decide before buying.
No mat (full-bleed) — The artwork fills the entire frame opening. A 16×20-inch frame is the correct match, holding the print edge to edge with the full image visible.
With a mat — The mat adds a border — typically 2 to 3 inches per side. A 16×20 print with standard matting needs a larger opening, and 20×24 inches is the most commonly recommended size, providing room for the mat border while keeping proportions balanced.
Already have a mat? Measure the outer edges of the mat itself, not the artwork. The frame must match those outer dimensions — if your mat measures 20×24, buy a 20×24 frame.
How to Measure Your Artwork Correctly
The most common error is measuring the outer frame or white border on a print instead of the image. Use a rigid ruler and record the width and height of the visible artwork only — from edge to edge, ignoring any printed margins, backing, or mounting board unless they will be visible inside the frame.
For a 16×20 print with white borders, decide whether those borders will show. If not, measure only the image area. If yes, include them. Once you have the correct dimension, apply the mat-or-no-mat rule above.
For canvases, measure at multiple points as stretcher bars can be slightly irregular. Use the largest measurement to avoid a tight fit, and confirm the frame’s rabbet depth — the groove holding the canvas — is deeper than the canvas stretcher bars; otherwise the artwork may not seat properly.
Common Mistakes That Waste Time and Money
- Buying a 16×20 frame for a matted print. A mat adds size, so a matted 16×20 needs a larger frame — usually 20×24.
- Measuring the outer frame opening instead of the artwork or mat. Frame size labels like “16×20” often describe the artwork or mat that fits inside, not the frame’s outer dimensions.
- Assuming “16×20” means the same thing everywhere. Some listings describe the inside fit, others the artwork size — read carefully and check product details.
- Forgetting that prints can have irregular edges or visible borders. Measure the part you want to show, not the paper edge.
If you are ready to buy, browse our top-rated 16×20 gold frame picks to see tested options that hold the correct opening size.
Does the Frame Size Change for Canvas or Poster?
Canvas — The same basic rule applies with two extra checks. First, measure at multiple points and use the largest figure. Second, verify the rabbet depth is deeper than the stretcher bar depth — most standard frames are built for paper prints and may be too shallow for stretched canvas. Look for frames explicitly labeled for canvas or deep rabbet compatibility.
Poster or photo — Standard prints follow the same 16×20 or 20×24 rule. Posters often come with white borders; the paper edge may be 16×20 but the actual image smaller. Measure the image you want visible and choose accordingly.
FAQs
Can I use a 16×20 frame with a pre-matted 16×20 print?
No — a pre-matted print already has a border, so the mat’s outer dimensions are larger than 16×20. You need a frame matching the mat’s outer size, typically 20×24. Forcing a matted print into a 16×20 frame will bend the artwork or mat.
What if I want to crop part of the image? How does that affect frame size?
If you only want part of the image visible, frame size must account for the crop and any mat window. Measure the portion you intend to show, then decide whether a mat will border it — a larger frame with a cut mat creates the visible window. Without a mat, the frame opening must match the cropped area directly.
Is a 16×20 frame the same as 16×20 inches actual outside measurement?
Not always. Many frame size labels refer to the artwork size that fits inside, not the frame’s outer dimensions. A frame sold as “16×20” typically means its inside or mat opening is 16×20 inches; the actual outside dimensions are larger. Always read the product specifications to confirm.
References & Sources
- Dick Blick. “Art & Picture Frame Buying Guide.” Standard framing recommendations including mat opening sizes and measurement practices.
- Adobe Express. “What Size Picture Frame Do I Need?” Guidance on matching frame size to print dimensions with or without matting.
- Adobe Express. “How to Measure a Photo Frame.” Instructions for accurate measurement of artwork and frame openings.
