Efficiency Calculator
Calculate brewhouse efficiency from actual vs potential extract.
Total weight of grain in your recipe
Weighted average — Maris Otter ~37
Volume of wort in the kettle
Gravity of the wort during the boil
Volume into fermenter
Gravity reading before fermentation
How We Calculate This
Potential Extract
Potential extract is the maximum sugar available from your grain: Potential Points = Grain (kg) x PPG x 8.345. PPG (Points per Pound per Gallon) is a standard measure of extract potential — Maris Otter is ~37, Pale Malt ~36, Munich ~34.
Mash Efficiency
Mash Efficiency = (Pre-Boil Gravity Points x Pre-Boil Volume) / Potential Points x 100. This tells you how effectively you extracted sugar during the mash and lauter.
Brewhouse Efficiency
Brewhouse Efficiency = (Post-Boil Gravity Points x Post-Boil Volume) / Potential Points x 100. This accounts for all losses and is the number to use when designing future recipes.
Frequently Asked Questions
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Last updated: 2025-02-20
All calculations are estimates. Always verify values and adjust based on your equipment and ingredients.