Fermentation Time Calculator

Estimate fermentation time for sauerkraut, kimchi, kombucha, or yogurt based on temperature and salt concentration.

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Minimum Fermentation Time

14.7 days

Ideal Fermentation Time21.0 days
Maximum Fermentation Time31.5 days
View formula & how it works →

How Fermentation Time Is Estimated

Key Factors

  • Temperature: Warmer environments speed up fermentation. 65-75°F is ideal for most lacto-fermentation.
  • Salt: Higher salt slows fermentation. Standard sauerkraut uses 2-3% salt by weight.
  • Ferment type: Each type has a different base timeline.

    • Base Times (at 70°F, 2.5% salt)

  • Sauerkraut/Kimchi: 14-28 days
  • Kombucha: 7-14 days
  • Yogurt: 8-12 hours
  • Sourdough starter: 5-10 days to establish

    • Example Calculation

    Estimate sauerkraut fermentation time at 70°F with 2.5% salt.

    1. 01Base time for sauerkraut = 21 days.
    2. 02Temp factor = 70 / 70 = 1.
    3. 03Salt factor = 1 + (2.5 - 2.5) x 0.2 = 1.
    4. 04Ideal time = 21 x 1 x 1 = 21 days.
    5. 05Minimum = 21 x 0.7 = 14.7 days.
    6. 06Maximum = 21 x 1.5 = 31.5 days.

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