Edit (9/9/2013)
Hey! Just letting you all know that every-now-and-xen made a tutorial for using this Calculator! So if you're having troubles with my wording for it, please check out her tutorial at this [link]! In addition, she also provided a site and a how to for finding the actual color at the end, so please do have a good look there too!
Edit (11/17/12)
OKAY GUYS, HERE'S THE DEAL WITH CONTACTING ME ON TUMBLR, don't send me an ask there about this calculator unless you honestly can't figure something out. Also, if you have a question, check the second link below (which has answers to questions) to see if someone else asked something sim