An 18×24 picture frame fits artwork and photos measuring 18 by 24 inches, a standard 3:4 aspect ratio print size.
For the full breakdown, see our best 18 X 27 Frame guide.
Whether you are framing a poster, a photo print, or a piece of art, an 18×24 frame is a common and versatile choice. The key to getting the right one is understanding how the listed size translates to the actual frame dimensions and what your artwork needs to fit securely.
Understanding 18×24 Frame Dimensions
The most important detail is whether a listing refers to the image size or the outer size. An 18×24 frame is typically sized for an 18×24 inch image, but the finished outer dimensions are almost always larger due to the frame’s border.
Here are the real-world measurements you might encounter:
- Image size: 18 x 24 inches is the standard fit for an 18×24 frame, creating a 3:4 aspect ratio.
- Outer size: Retail listings show finished dimensions like 20.5 x 26.5 x 1 inches or 20 x 26 inches, which include the frame’s width.
- Visible area: Without a mat, the visible area is often about 17.5 x 23.5 inches because the frame’s lip overlaps the artwork edge.
- Metric equivalent: Many sellers also list this size as 46 x 61 cm.
How to Choose the Right Frame for Your Print
Before buying, measure your artwork exactly. If your print is a true 18×24, you need a frame with an 18×24 image opening. If you plan to use a mat, the frame’s opening must be larger than your print to accommodate the mat border.
If you are working with a different print size that you want to mat inside an 18×24 frame, common mat openings are 15.5 x 19.5 inches for a 16×20 print and 11.5 x 17.5 inches for a 12×18 print. If you’re considering a different size for your wall, our roundup of the best 18 x 27 frame options might be a better fit for larger artwork.
Critical Fit Checks: Depth, Glass, and Hardware
Not all 18×24 frames are the same. To avoid a return, verify these three things before you buy.
Check the Rabbet Depth for Thick Artwork
The rabbet is the recessed lip where the artwork sits. Standard paper prints fit fine, but canvas, mounted prints, or layered pieces need more room. Measure your art’s thickness to confirm a match.
Confirm the Glazing and Materials
Listings vary between glass, acrylic, and UV acrylic. Some premium frames use tempered glass or UV acrylic with foam board backing, which offers better protection against fading. Check the product details so you know what you’re getting, as not all frames include glass.
Verify Hanging Hardware is Included
Some 18×24 frames come with hanging hardware for landscape or portrait orientation. Others omit it entirely. If you’re wall-mounting, confirm the hardware is included or plan to purchase it separately.
Common Sizing Mistakes to Avoid
Mistakes happen when the “size” isn’t clarified. A frame sold as “18×24” may have a larger outer dimension, which matters if you’re placing it in a specific spot. Ignoring the mat effect is another error—a mat reduces the visible area and changes the needed frame size. And assuming all frames include glass or hardware leads to disappointment
For a quick reference on the key specs, use this guide:
| Measurement | Typical Dimension |
|---|---|
| Image Size | 18 x 24 inches (3:4 ratio) |
| Visible Area (no mat) | ~17.5 x 23.5 inches |
| Outer Frame Size | Up to 20.5 x 26.5 inches |
| Mat Opening for 16×20 | 15.5 x 19.5 inches |
| Mat Opening for 12×18 | 11.5 x 17.5 inches |
Meanwhile, ArtToFrames sells an Off White on Ash Wood 18×24 frame at Target, and
FAQs
What does 18×24 mean for a picture frame?
An 18×24 frame is designed to hold a picture or print that measures 18 inches by 24 inches. This is the image size, or the inner opening where the artwork sits. The frame’s total outer size will be larger due to its border.
What is the aspect ratio of an 18×24 frame?
The 18×24 dimension corresponds to a 3:4 aspect ratio. This is a standard ratio for many photographic prints, which makes it a versatile size for displaying a wide variety of images and posters.
Will a 16×20 print fit in an 18×24 frame?
Yes, a 16×20 print fits in an 18×24 frame, but you will need a mat with an opening of about 15.5 x 19.5 inches to fill the extra space and hold the print in place securely.
References & Sources
- IKEA. “RÖDALM Frame for 9 pictures.” Shows a multi-picture variant with a 4 x 6-inch image size and 3 1/2 x 5 1/2-inch mat opening.
- Target. “ArtToFrames 18×24 Inch Off White on Ash Wood Picture Frame.” Provides an example of an 18×24 frame with specific outer dimensions and materials.
- Americanflat. “18×24 Frames Collection.” Lists a variety of 18×24 frames with a starting price of $15.99.