Brewing Tools
Hop Freshness Calculator
Estimate how much alpha acid your hops have lost based on storage time, temperature, packaging type, and the hop variety's Hop Storage Index (HSI) stability rating.
Current alpha acid9.53%
Alpha lost4.7%
Freshness factor0.953
Use this much more4.9%
Oxidized alpha / beta0.47% / 0.14%
Hop storage index0.285
Estimate current alpha acids
Hop alpha acids decline as hops oxidize. Storage temperature and oxygen exposure drive most of the loss, so freezer storage and sealed packaging preserve bitterness potential.
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