Skip to main content
Calcimator

Mash Efficiency Calculator

Measure your actual mash efficiency by comparing extracted gravity points to the maximum potential from your grain bill.

Inputs

points
gallons
lbs
PPG

Results

Mash Efficiency

66.8%

Actual Points Extracted247
Maximum Possible Points370
Points Per Pound24.7 PPG
How to Use This Calculator
  1. Take a pre-boil gravity reading and enter it along with pre-boil volume in gallons.
  2. Enter total grain weight in lbs and the max potential points for your grain bill.
  3. Review Mash Efficiency (%), Actual Points Extracted, and Points Per Pound.
  4. Use the efficiency reading to adjust your next recipe's water-to-grist ratio or crush gap.

How the result changes with Grain Weight

Grain WeightMash Efficiency
1160.7%
3618.5%
6510.3%
907.4%

What each input means

Pre-Boil Gravity
Gravity reading before the boil in points (e.g., 38 means 1.038). Take a sample and correct for temperature.
Pre-Boil Volume
Volume of wort in the kettle before boiling begins. Measure after all runnings are collected.
Grain Weight
Total weight of all grains in the mash in pounds.
Max Potential Points
Maximum gravity points per pound per gallon for your base malt. 2-Row is 37, Pilsner is 36, Wheat is 38.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Pre-Boil Gravity = 38, Pre-Boil Volume = 6.5, Grain Weight = 10, Max Potential Points = 37 = 4 input(s) provided
  2. Calculate Mash Efficiency
    66.8 = 66.8%
  3. Calculate Actual Points Extracted
    Actual Points Extracted
    247 = 247
  4. Calculate Maximum Possible Points
    Maximum Possible Points
    370 = 370

Related Calculators

The questions that sit next to this one — chosen by subject, including calculators filed under a different category.

Brewing

All-Grain Recipe Calculator

Calculate grain weight and water volumes for all-grain brewing based on batch size, target gravity, and mash efficiency.

Brewing

Strike Water Calculator

Calculate the correct strike water temperature and volume for your mash based on grain weight, target mash temperature, and grain temperature.

Distilling

Mash Bill Calculator

Calculate individual grain weights for your distilling mash bill based on total grain weight and percentage of each grain type.

Brewing

Sparge Water Calculator

Calculate the volume and temperature of sparge water needed based on grain weight, mash water volume, grain absorption, and target pre-boil volume.

More in Cooking, Food & Beverage.