Mash Efficiency Calculator

See how much sugar you pulled from the grain by comparing your measured gravity to the grain's potential. Enter your gravity, volume and grain bill.

How to calculate mash efficiency

Five gallon all grain batch

OG 1.050, 5 gal, 10 lb, 37 PPG

250 of 370 points, 67.6% efficiency

How is mash efficiency calculated?

Efficiency = actual points / potential points x 100. Actual points are (OG - 1) x 1000 x gallons, and potential points are grain pounds x PPG.

What is a gravity point?

A gravity point is the part of specific gravity after the decimal x 1000. A gravity of 1.050 is 50 points, and points scale with batch volume.

What PPG should I use?

Base malts yield about 37 points per pound per gallon, the default here. Adjust the PPG for a different grain bill or a weighted average.

What is a good efficiency?

Many home systems land near 65 to 75 percent. Finer crush, a longer mash and good sparging push it higher; channeling drags it lower.

Is this mash or brewhouse efficiency?

It depends on where you measure gravity and volume. Use pre-boil numbers for mash efficiency, or into-fermenter numbers for brewhouse efficiency.