Beer Fermentation Timeline
without the guesswork.
Homebrew Beer Fermentation Schedule — Use next-day gravity stability, recipe target, yeast temperature and batch condition before scheduling packaging. Includes a practical guide and embedded calculator. Inputs stay in your browser.
American Homebrewers Association guidance uses matching hydrometer readings on consecutive days—not airlock activity or a fixed fermentation day—to judge whether fermentation appears complete.
Context matters.
- Airlock bubbling can stop before fermentation is complete and can continue after fermentation from temperature or pressure changes.
- For bottles, use a recipe-specific priming calculation and sound pressure-rated bottles; excess fermentable sugar or incomplete fermentation can create dangerous pressure.
- Suspected contamination, abnormal film, rope, mold, vessel overpressure or package swelling needs experienced brewing-safety evaluation rather than tasting or waiting.
Sources & scope
This page shows the source trail, jurisdiction and review date alongside the result. Always confirm time-sensitive rules with the linked authority.
What to know before using the result.
How does CalcSpan decide fermentation appears complete?
It follows AHA hydrometer guidance: matching specific-gravity readings taken on consecutive days, plus the entered recipe target and yeast-temperature history.
Why is airlock activity not an input?
Bubbles can stop while fermentation continues or appear from temperature and pressure changes after fermentation. Gravity readings are the useful decision signal.
Does the packaging checkpoint calculate priming sugar?
No. Bottlers must use the recipe's priming guidance and sound pressure-rated bottles; incomplete fermentation or excess sugar can create dangerous pressure.