This guide will walk you through everything you need to know to make choosing your mat size a breeze.
Contents
-
1 Outer Size
-
2 Opening Size
- 3 How Wide Should a Picture mat Be?
- 4 Should you Bottom-Weight Your Mat Board?
- 5 Save Money Framing
Outer Size
The outer size of your mat board are the dimensions measuring the outside of the mat board.Choosing Your Outer Size
- This is the same as your frame size. (a 11x14 mat will fit perfectly in a 11x14 frame)
- If you don’t have your frame in hand and have only your artwork, your outer size depends on how wide you’d like your mat board to be. (this guide will go over pros and cons of different widths further on)

Opening Size
The opening size of the mat board is the inner measurement of the mat board.Choosing Your Opening Size
- If you’d like the edges of your artwork to be covered by the mat board, the opening size should be ¼” - ½” smaller than your artwork size. How much smaller depends on how much you’d like your artwork to be covered.
- (An opening size that is ¼” smaller will cover ⅛” of your artwork on all sides. ½” smaller will cover ¼” of your artwork.)
How Wide Should a Picture Mat Be?





Should You Bottom-Weight Your Mat Board?
Bottom-weighting is when the bottom mat border is wider than the top and side borders.
- If art is high on the wall, bottom-weighting will “even out” the effect of looking up at your art. This way your artwork will look centered even when looking up at it.
- If you’re familiar with graphic design, you’ve probably heard of the “visual center.” It’s a point slightly above the geometric center. This is considered to be the true center as the eye/brain feels the weight of gravity and the bottom mat border will feel narrower without it.
- Stylistic reasons. In these cases, the bottom mat border is made substantially wider than the top and side borders.
- Square prints generally look better without being bottom-weighted
- If your print features a signature over some white space at the bottom, it is already bottom-weighted. Additional bottom-weight is up to you.
Standard Mat Board Sizes
To save money framing, one thing you could do is figure out the mat border you’d like and then find the closest standard size frame that’ll give you what you like. Here are a list of common print sizes and mat board outer sizes we suggest (for frame width = 1”):
Artwork/Print Size |
Suggested Outer Size |
Mat Board Width (centered) |
4x6 |
8x10 |
top/bottom: 2” right/left: 2” |
5x7 |
11x14 |
top/bottom: 3” right/left: 3.5” |
8x10 |
12x16 |
top/bottom: 2” right/left: 3” |
11x14 |
16x20 |
top/bottom: 2.5” right/left: 3” |
11x17 |
18x24 |
top/bottom: 3.5” right/left: 3.5” |
12x16 |
18x24 |
top/bottom: 3” right/left: 4” |
13x19 |
18x24 |
top/bottom: 2.5” right/left: 2.5” |
16x20 |
22x28 |
top/bottom: 3” right/left: 4” |
Link: 11x14 Economy Pre-Cut Mat Board Link: 16x20 Economy Pre-Cut Mat Board
Conclusion
Matting is an art. And in any art, there aren't any hard rules. Instead, think of these as guidelines or a good starting point to creating an aesthetic finish. Some key points to remember: - Outer size is your frame size - Opening size should be slightly smaller (1/4" - 1/2") than your artwork size to cover the edges - mat border of ~2-3" for small to medium artworks and 4"+ for larger artwork is a good rule of thumb - mat border should be larger than frame width - bottom-weighting is ultimately up to personal taste - save money by using standard sizes Thanks for reading!
Leave a comment