Grain Bill Calculation

[DawgBrewer]

Does anyone know of a good/free online homebrewing calculator that I can plug in the percentage of each grain in my bill to calculate for a 5 or 6 gallon batch? I'm trying to use Kaiser's Altbier recipe for a 6 gallon batch with a boil volume of 7.9 gallons. Any insight would be greatly appreciated.

 

[GilSwillBasementBrews]

http://hbd.org/recipator/
Beer recipator might help