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Calcimator

Mash Bill Calculator

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

Inputs

lbs
%
%
%
%

Results

Corn

39.2 lbs

≈ 9 bags of sugar

Rye5.6 lbs
Malted Barley8.4 lbs
Wheat2.8 lbs
Total Percentage100%
Water Needed (approx)5.09 gallons
Potential Alcohol (approx)3.36 gallons
How to Use This Calculator
  1. Enter total grain weight in lbs for your batch.
  2. Set percentages for corn, rye, malted barley, and wheat (must total 100%).
  3. The calculator shows weight of each grain in lbs, total percentage check, approximate water needed, and potential alcohol in gallons.
  4. Use these grain weights to weigh and mill each component before mashing.
  5. Bourbon requires at least 51% corn; rye whiskey requires at least 51% rye—verify your percentages meet legal definitions.

How the result changes with Total Grain Weight

Total Grain WeightCorn
10170.7 lbs
351245.7 lbs
650455 lbs
900630 lbs

What each input means

Total Grain Weight
Total weight of all grains combined. One bushel of corn is 56 lbs, a common starting point.
Corn
Percentage of corn in the mash. Bourbon requires at least 51% corn by law.
Rye
Percentage of rye. Adds spicy character. Rye whiskey requires at least 51% rye.
Malted Barley
Percentage of malted barley. Provides enzymes for starch conversion. Typically 10-15%.
Wheat
Percentage of wheat. Adds a softer, sweeter character. Wheated bourbon uses 15-20%.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Total Grain Weight = 56, Corn = 70, Rye = 10, Malted Barley = 15 = 5 input(s) provided
  2. Calculate Corn
    Corn
    39.2 = 39.2
  3. Calculate Rye
    Rye
    5.6 = 5.6
  4. Calculate Malted Barley
    Malted Barley
    8.4 = 8.4

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