"This is a free (for non-commercial use) and easy-to-use calculator that will calculate a complete string set for you. It works for any acoustic or electric plucked instrument that can be strung with guitar strings, from baritone guitars to piccolo mandolins. All you have to do is enter the type of strings (electric, nylon, acoustic steel string), the scale length (for multiscale instruments, two scale lengths), and the note for each string, and the calculator will perform the calculations and email you the specifications for your string set, composed of D'Addario single guitar strings. It will also include specs for an additional higher tension string set and an additional lower tension string set. And if one or more of the strings in the set could be either a plain or a wound string, the calculator will provide specs for both, so you can choose which one you want."