How to Use the Home Brew Fermentation Timer
Fermentation time depends heavily on yeast type, temperature, and sugar content. Select your beverage type, fermentation temperature range, and original gravity to get an estimated primary and secondary fermentation timeline. These are estimates — always confirm completion with a hydrometer. Two identical FG readings taken two days apart is the gold standard for fermentation complete.
Typical Fermentation Times by Style (at 68°F / 20°C)
| Beverage | Primary | Secondary |
|---|---|---|
| Ale | 7–14 days | 5–10 days |
| Lager | 14–28 days | 14–28 days cold |
| Wine | 10–21 days | 10–21 days |
| Hard Cider | 7–14 days | 5–10 days |
Frequently Asked Questions
Not necessarily. CO₂ production can stop before all sugars are fermented, especially in warm conditions. Always confirm with two consecutive identical hydrometer readings.
Yes — rapid swings stress the yeast and can produce off-flavors (fusel alcohols, acetaldehyde). Keep fermentation in a stable-temperature environment: a basement, cooler, or fermentation chamber.