Efficiency is a figure used to describe how much of the potential sugars that are available from your grains have actually been extracted, typically given as a percentage.

• Mash efficiency only takes into account how much of this sugar was extracted during the mash.
• Brewhouse efficiency takes into account losses such as; boil off, trub and transfer losses, all of which affect your final gravity.

In this way, Brewhouse efficiency is a measure of the overall efficiency of your system.