Mr
Zainasheff's online calculator which helps homebrewers calculate an
optimal amount of yeast to add to wort when making homebrew beer.The application lets you specify if you are brewing an ale or a lager,
what your original gravity will be. Then based on the the source of
your yeast, will help you decide how much yeast to pitch, and how big
of a yeast starter to make, when appropriate.Find more great homebrew information from Jamil on http://www.mrmalty.com