Aj, how much string you need depends on how often you tie off, and sometimes even the thickness/stretchiness of the string can affect it. There's not a formula for calculating the length. The best thing to do (in my opinion) is to use a piece that's as long as you're comfortable working with, then tie on more if you need it.

dude this is rad Im going to make this for my friend DJPRS thx

This is so radd. :3

that means you did it wrong you should always keep referring back to the pattern after each row, to make sure it's correct.

@ TheRainbowNinja, you're not the first person to say that. I wish the site had one too. but unfortunately I am one person and I barely have time to maintain the site, let alone make applications. I would have to save up and pay someone to make the apps for me.