Sparge Volume Calculator
Calculate sparge water volume based on grain absorption, mash volume and target pre-boil volume.
Final volume into fermenter
Total grain bill weight
Litres of mash water per kg of grain
Duration of the boil
Your sparging technique
How We Calculate This
Water Calculation
Mash water = Grain weight x Water-to-grain ratio
Pre-boil target = Batch size + Boil-off + Trub loss
Sparge water = Pre-boil target - (Mash water - Grain absorption - Dead space)
Total water = Mash water + Sparge water
Frequently Asked Questions
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Last updated: March 2026
All calculations are estimates. Always verify values and adjust based on your equipment and ingredients.