Batch sparge

This calculation is presented in John Palmer’s How to Brew for scaling up a regular-sized all-grain recipe to the size needed for the batch sparging technique he presents. Normally, recipes assume an extract potential of about 36 ppg for all-grain brewing, but the batch sparge technique instead yields 28 ppg; this calculation will tell you what your scaled-up grain bill for the recipe should be, as well as how much water you’ll need for the mash.

Enter your inputs
Enter the target gravity (OG):
Recipe’s total grain bill (pounds):
Recipe batch size (gallons):
Recipe boil volume (gallons):

Water-retention coefficient:

Batch sparge water volume (quarts):
Batch sparge mash ratio (quarts/pound):
Scale-up factor:
Grain bill (total pounds):
Volume of water for mash (quarts):
Boil gravity:
Gravity of 1st runnings:
Gravity of 2nd runnings:
Total volume of mash (quarts):