Not too much to draw out really, figure those squares in the 9-patch type units are 1" finished. There are 40 of them (15 on the smaller/left and 25 on the larger right -- notice that the rows as designed start and end with Light/dark/Light units), +(2) 1", inner borders, +(2) .5" borders, and then the outer borders are 5" finished for the measurement.