Cabled Afghan Square

I am making this http://http://www.diynetwork.com/diy/na_knitting/article/0,2025,DIY_14141_3502276,00.html

I want to include a couple of different cabled squares, but am having trouble figuring out how much to increase for different cables.

Go here and scroll down for answer
http://www.dummies.com/WileyCDA/DummiesArticle/id-879.html