I had purchased a 22 3/8" square coffee table and wanted to protect the top. Somehow came across ExactMats and it looked like a quality site. And it is! My particular square mat arrived with 22 3/8" x 22 1/2" dimensions, so 1/8" overhang. I called for 1) suggestions on how to trim it and 2) to see what they thought. I was told they have an 1/8" tolerance wriggle room.....so there you go.....within tolerance. Haha.....as it turns out, my coffee table unfolds to make a larger rectangular table when lifted. This 40mil mat is for that rare time I will expand my table. So, it actually is sitting underneath the everyday table top. So, I can live with the 22 1/2" length and not even bother to trim it, as I will most likely screw it up. So, all good!