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Brew Mates Brewery - Brew Days: Get Involved

Wort and Beer


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Water: calculate water required for your mash



General instructions

  1. The first thing you should do is use the calculator in part 1 to work out how much water in total you should aim for in your mash.
  2. Then for a single-step infusion mash use part 2 and if you require more than one mash step you will need to use all steps.
  3. Calculations provided by John Palmer (How to Brew).


1. Calculate total mash water required

Grain (kg):   
Total mash water required (L):   

1. Instructions

  1. Enter the total quantity of grain that is specified in the recipe and press the calculate button. The result is based on Graham Sander's calculations.
  2. Sparge with the same amount of fresh water.


2. Calculate mash strike temperature

T1 (°C):   
T2 (°C):   
r (ratio):     Total mash water required (L):     Grain (kg):   
Tw (°C):   

2. Instructions

  1. Enter the following values.
  2. T1: the initial temperature of the mash (i.e temperature of the grain).
  3. T2: the target temperature of the mash.
  4. r: ratio of water to grain. Change this by modifying "mash water required".
  5. Tw: the temperature of the infusion water that you want.


3. Calculate mash water required for each step

T1 (°C):   
T2 (°C):   
G (kg):   
Wm (L):   
Tw (°C):   
Wa (L):   

3. Instructions

  1. Enter the following values.
  2. T1: initial temperature of the mash (i.e temperature of the grain).
  3. T2: target temperature of the mash.
  4. G: total amount of grain in the mash.
  5. Wm: total amount of water in the mash (before adding additional water).
  6. Tw: the temperature of infusion water. This should be at least 77°C and can be boiling. The former will require more water to be added to the mash.
  7. Wa: the amount of boiling water that you want to add.
  8. If you want to add another mash step then remember to keep adding up the total volume of water.



Calculate your mash efficiency



1. Calculate the mash efficiency for your brew

Expected OG:   
Actual OG:   
Mash efficiency (%):   

1. Instructions

  1. Enter the OG numbers in brewer's degrees, eg: 1.050 is "50".


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