Brewhouse Efficiency Calculator

Written By brynn keenan

Brewhouse efficiency measures how much of the sugar available in your grain actually ends up in your wort. Low brewhouse efficiency usually means extract is being lost due to equipment limitations, process issues, or both.

What’s normal?

  • Small craft breweries: 75–85%

  • Production craft breweries: 85–90%

  • Large regional / macro systems: 90–95%

How this calculator works

On brew day, your measured volume and gravity determine how much extract you actually collected.

  • Use pre-boil volume and gravity to calculate mash efficiency

  • Use post-transfer volume and gravity to calculate brewhouse efficiency

This calculator includes default CGAS (Coarse Grind, As-Is) extract values as estimates. For the most accurate results, you should replace these values with the coarse grind, as-is numbers from your malt COA.

If you’d like to calculate it yourself or learn more about improving brewhouse efficiency, check out our webinar on brewhouse efficiency.

brynn keenan
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Yeast Management and Pitching Calculations