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Calcimator

All-Grain Recipe Calculator

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

Inputs

gallons
points
%

Results

Grain Weight

9.38 lbs

≈ 2 bags of sugar

Total Water Needed

7.17 gallons

≈ 7 milk jugs

Mash Water3.12 gallons
Sparge Water4.05 gallons
Target OG1.05
How to Use This Calculator
  1. Enter your target batch size in gallons and target OG points.
  2. Set mash efficiency (%) — typically 70–80% for most systems.
  3. Select your primary grain type (2-Row, Pilsner, or Wheat).
  4. Review Grain Weight, Total Water Needed, Mash Water, Sparge Water, and Target OG.

How the result changes with Mash Efficiency

Mash EfficiencyGrain WeightTotal Water Needed
5512.29 lbs7.54 gallons
6610.24 lbs7.28 gallons
798.55 lbs7.07 gallons
917.43 lbs6.93 gallons

What each input means

Batch Size
Final volume of beer into the fermenter in gallons. Typical homebrew batch is 5 gallons.
Target OG Points
Target original gravity in points (e.g., 50 means OG 1.050). A pale ale is typically 45-55.
Mash Efficiency
Expected brewhouse efficiency. New brewers typically see 65-72%, experienced brewers 75-85%.
Primary Grain Type
Base malt type: 1 = 2-Row (37 PPG), 2 = Pilsner (36 PPG), 3 = Wheat (38 PPG).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Batch Size = 5, Target OG Points = 50, Mash Efficiency = 72, Primary Grain Type = 1 = 4 input(s) provided
  2. Calculate Grain Weight
    Grain Weight
    9.38 = 9.38
  3. Calculate Total Water Needed
    Total Water Needed
    7.17 = 7.17
  4. Calculate Mash Water
    Mash Water
    3.12 = 3.12
  5. Calculate Sparge Water
    Sparge Water
    4.05 = 4.05

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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