beerbeer95648
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Using your post boil volume corrected for cooling shrinkage (boil volume X 0.96) and the post boil gravity you use the following: Post boil volume X end of boil SG (last 2 digits only) / desired dilute SG (last 2 digits only) = total volume into the fermenter. Back out the known wort volume and you have the water needed. 14 gal post boil X 1.056 post boil (56) divided by 1.045 (45) equals a total volume of 17.42 gallons. 17.42 minus 14 gallons equals 3.42 gallons dilution water. (14X56)/45 = 17.42, 17.42-14 = 3.42.