Dealers About Contact link to Logan on Facebook link to Logan on Twitter link to Logan on Instagram link to Logan on YouTube
Logan's Complete Guide to Picture Framing
Measuring and Sizing Picture Frame Mats - Mat Mathematics
Guide Navigation
Introduction to Picture Framing & Matting
Designing Your Picture Frames and Mats
Measuring and Sizing Picture Frames and Mats
Costs of Picture Framing
DIY Picture Frames
Mat Cutting
Mat Cutter Choices
Mat Cutting Help, Troubleshooting and FAQs
Mounting Your Artwork
Glazing with Glass and Plastic
Securing or Fitting your Artwork in a Picture Frame
Finishing Your Artwork


To determine the opening of the mat, measure the artwork. The mat must cover at least 1/8" of the artwork on all sides, in order to prevent the edges from peeking through or actually falling through the mat opening. More of the edges of the artwork may be covered if desired, but the very minimum is 1/8".

Consequently, if a photograph measures 8" x 10", the opening will be 7-3/4" x 9-3/4", or perhaps 7-1/2" x 9- 1/2". Always check the exact image size and where the opening will be positioned on the artwork. After the proper opening is established, add the amount of matting desired.

1. Add the amount of both side borders to the horizontal opening measurement.

2. Add the amount of both the top and bottom borders to the vertical opening measurement.

It is often useful to add extra matting to the border size so the measurements become round numbers which are easier to work with. For example:

An 8" x 10" photograph has an actual opening of 7-3/4" x 9-3/4". With a 2" mat border on all four sides, the outside mat edge will be 11-3/4" x 13-3/4".

By adding 1/8" to each border (now 2-1/8"), the result is a 12" x 14" mat, which will also be the size of the frame and glass.

learning center