Figuring gage

I saw a book by jackie fee and sweaters that had a calculation page in it for refiguring the gage of anything that you are working on, its more like you are making a new garment, i was wondering since i dont have the book, if anyone has that formula it is alot of figurering but we want to knit a sweater and are really worried about gageing if anyone can help out there that would be great

thanks
suzi55

Do any of these help you?

http://www.yarnforward.com/tension.html

http://www.theknittersbag.com/knitting-sweaters.htm

Although that one has pages for other clothing items as well:
http://www.theknittersbag.com/yarn-requirements.htm