An online calculator to determine yield

Many may have seen this, for those that haven't here is the link. I know there are a lot of variables that go into yield, however this should give you a rough of yield, it also shows you how often you need to grow in order to yield enough for your consumption. Anyway thought I would share.

http://www.angelfire.com/cantina/fourtwenty/yor/yieldcalc.htm

If that's accurate, I need to step up my game to be totally self-sufficient.

It's too bad nobody has made one of these for CFLs.