Just input the wrist size for the bracelet you want to make, press "Calculate", and this app will tell you everything you need to know! The "Material Cost" field is calculated by adding the average cost of buckles, $0. 51 for bracelets/$0. 61 for 4 Strand Round Braid or $1. 10 for LightBanz bracelets + cost of cord used, usually about $0. 10/ft.