Sparge Pal is the all-grain beer home brewers best friend.
Based on the Mash & Sparge Calculator at
http://www.brew365.com/mash_sparge_water_calculator.php
This calculator will provide you with the correct volume and temperature at which to mash and sparge your grains for optimum starch conversion.
Please see Brew Pal (http://www.brewpal.info) for a much more fully featured brewing calculator.
RDWHAHB!