Hop Storage Index Calculator

Formula

The formula to calculate the Hop Storage Index is:

\[ HSI = \frac{T \cdot H \cdot A}{D \cdot M} \]

Where:

\(HSI\) is the Hop Storage Index (%)
\(T\) is the temperature of storage (°C)
\(H\) is the humidity level (%)
\(A\) is the age of the hops (months)
\(D\) is the dry matter content (%)
\(M\) is the moisture content (%)

What is Hop Storage Index?

A Hop Storage Index (HSI) is a measurement used in brewing to determine the rate at which hops lose their alpha acids, the compounds responsible for the bitterness in beer. The HSI is expressed as a percentage, with higher percentages indicating a faster loss of alpha acids. This index helps brewers understand how long they can store hops without significant loss of flavor and bitterness. Factors such as temperature, packaging, and the specific variety of hop can all influence the HSI.

Example Calculation 1

Let's assume the following values:

Temperature of Storage (T) = 5 °C
Humidity Level (H) = 60 %
Age of the Hops (A) = 12 months
Dry Matter Content (D) = 80 %
Moisture Content (M) = 10 %

Using the formula:

\[ HSI = \frac{5 \cdot 60 \cdot 12}{80 \cdot 10} = \frac{3600}{800} = 4.50 \% \]

The Hop Storage Index is 4.50 %.

Example Calculation 2

Let's assume the following values:

Temperature of Storage (T) = 2 °C
Humidity Level (H) = 50 %
Age of the Hops (A) = 6 months
Dry Matter Content (D) = 75 %
Moisture Content (M) = 12 %

Using the formula:

\[ HSI = \frac{2 \cdot 50 \cdot 6}{75 \cdot 12} = \frac{600}{900} = 0.67 \% \]

The Hop Storage Index is 0.67 %.