Handy Calculators & Charts Ever wondered how to work out the yardage of a ball? Or how to substitute yarn? We've created a whole host of calculators that will aid you with your knitting maths questions: http://www.loveknitting.com/knitting-calculators Have more questions? Send us a message Comments Denise Thompson 14 January 2017 13:29 What are the rules when knitting a tension square. Have Aran wool and knitting moss stitch , 20 stitches does make 4cm but 24 rows didn't make 4cm a few more rows needed to be added ( I'm a loose knitter) will this make a difference to the jumper I'm making?