The number of squares on the square side is 22 x 25.
Hexes are 21/22 x 28. The width alternates between 21 and 22 hexes, so no play space is wasted.
"I bought this and a Crystal Caste 48"x36" battlemat. This is a very good quality mat, easy to use and move about. Its smaller size makes battles kind of small and limiting but I wont let that tarnish the score as it states its size clearly. I did not thoroughly test how long the wet erase markers can stay on without staining. I tested one corner and wiped off all four lines from a Staedtler 4 color wet-erase marker set 24 hours after I set them and they came off just fine. Only thing I recommend is getting a bigger one, this small mat works fine for building or cave encounters and the like, but if you want to do a field battle look elsewhere."