OK, don't hold me to this, but I think I need 192 string blocks to make my twin size quilt. The blocks will finish 5.5 inches. According to a chart I have, a twin size quilt measures 63 x 87. So 12 blocks across and 16 blocks down. Guess I need to make a few more blocks before I start putting this quilt together. I may even want it to be a little bigger than what the chart calls for, we'll see. And I have another two blocks done.