Enter the weight of the grain and the absorption rate into the calculator to determine the grain absorption (the volume of water absorbed by the grain). This calculator can also evaluate any of the variables given the others are known.
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Grain Absorption Formula
The following formula is used to calculate the volume of water absorbed by grain during mashing (grain absorption).
GA = W \times A
Variables:
- GA is the grain absorption (volume of water absorbed by the grain) (liters)
- W is the weight of the grain (kg)
- A is the absorption rate (liters/kg)
To calculate the grain absorption (volume absorbed), multiply the weight of the grain by the absorption rate. The result is the amount of water retained by the grain and typically not recovered as runoff/wort.
What is Grain Absorption?
Grain absorption refers to the process in brewing where grains absorb water during the mashing process. This is a crucial step in brewing as it affects the amount of water needed for the process and the concentration of the final product. The absorbed water is not recoverable, meaning it does not contribute to the volume of wort collected from the mash, which is why brewers need to account for grain absorption when calculating their water needs.
How to Calculate Grain Absorption?
The following steps outline how to calculate the Grain Absorption using the formula GA = W × A.
- First, determine the weight of the grain (W) in kilograms.
- Next, determine the absorption rate (A) in liters per kilogram.
- Next, use the formula GA = W × A to calculate the grain absorption.
- Then, multiply W by A to find GA (the volume of water absorbed) in liters.
- If you need to solve for a different variable, rearrange the formula (for example, A = GA / W or W = GA / A).
Example Problem:
Use the following variables as an example problem to test your knowledge.
Weight of the grain (W) = 10 kg
Absorption rate (A) = 0.5 liters/kg
Grain absorption (GA) = 10 × 0.5 = 5 liters
