Mash Efficiency Calculator

How It Works

Brewhouse efficiency measures what percentage of potential grain sugars actually end up in your fermenter. It combines mash efficiency (how well enzymes convert starch to sugar), lauter efficiency (how completely you rinse sugars from the grain), and losses from transfers and trub. Typical values: extract brewing 100% (pre-dissolved), BIAB 70-80%, traditional 3-vessel all-grain 65-75%, commercial systems 85-95%. Consistency matters more than hitting a high number — once you know your efficiency, you can adjust grain amounts to hit any target gravity. To improve efficiency: mill grain finer, mash longer, sparge slower, and improve lauter tun geometry.