Sphere pattern calculator!

After wanting to make a sphere out of foam for a cosplay prop and struggling to find a guide on how to do so (and not wanting to buy a pattern or print things) i decided to embark on the long journey of making a little calculator to help make em :)! My first time using text inputs and canvas, sadly it is all javascript dependent as it is programmed in plain ol js :p

The only equipment needed is paper, a pencil, and scissors

(and a way to get right angles would be useful) You put in all the info of the pattern and it gives back all the measurements you need to draw out the pattern with a little diagram! (sadly i dont know how to get it to actually draw it). it is a mostly mobile friendly site!

Im hoping my maths all works out, i havent actually tried out making a sphere yet.. >_>" but theoretically i think its right :) (feel free to inspect element and look at the code) The maths isnt too complicated, and if anyones curious I can try explain whats going on ^_^