Fermentation time with bread yeast

    Same must at 15C and 25C - the difference is not days, it is weeks. Enter your wine type, Brix, temperature and yeast to get estimated primary and secondary fermentation time plus a day-by-day monitoring schedule.

    Set to bread yeast, the calculator applies a rule the neighbouring options do not. Alcohol tolerance is the real difference: bread yeast gives up well before a wine strain does, and wild yeast is unpredictable in both directions. This page opens the calculator with bread yeast already selected, so only the remaining fields are left to fill in. Swap in your own figures and the arithmetic is rebuilt from them.

    Parameters

    Enter data for calculations

    The base fruit or honey determines baseline fermentation duration.

    Measured with a refractometer or hydrometer before pitching yeast.

    Room or fermentor temperature in Celsius.

    Yeast type affects speed and quality of fermentation.

    Form progress0 / 4 fields

    💡 Fill in all required fields to unlock the calculate button

    Same must at 15 C and 25 C - the difference is not days, it is weeks

    Temperature shifts fermentation speed dramatically. A grape must at 22 Brix finishes primary fermentation in about 7 days at 20 C with wine yeast. Drop the temperature to 15 C and that number climbs to 8-9 days. Push it down to 12 C and you might wait 13+ days - if fermentation starts at all. This calculator takes your wine type, sugar content, temperature and yeast, then estimates how long primary and secondary fermentation will take. It also builds a day-by-day monitoring schedule so you know when to check gravity, when to rack, and when to bottle.

    How to estimate fermentation time - step by step

    1. Select your wine type - grape, apple, plum, cherry, mead or other. Each fruit has a different baseline fermentation speed.
    2. Enter the Brix reading - measure your must with a refractometer or hydrometer before pitching yeast. Higher Brix means more sugar and longer fermentation.
    3. Enter the temperature - the room or fermentor temperature in Celsius. This is the single biggest variable after yeast type.
    4. Choose your yeast - wine yeast (fastest, cleanest), bread yeast (slower, lower alcohol tolerance) or wild (unpredictable).
    5. Read your results - primary days, secondary days, total time, potential ABV and a monitoring schedule.

    Before and after - how each variable changes fermentation time

    The table below shows the same white grape wine (22 Brix, wine yeast) under different conditions. The "before" column uses baseline parameters; the "after" column changes one variable at a time.

    Variable changed Before (baseline) After (changed) Time difference
    Temperature 20 C vs 14 C 35 days 50 days +15 days
    Brix 22 vs 28 35 days 45 days +10 days
    Wine yeast vs bread yeast 35 days 45 days +10 days
    Wine yeast vs wild yeast 35 days 63 days +28 days
    Temperature 20 C vs 25 C 35 days 30 days -5 days

    Baseline fermentation times by wine type

    These numbers assume 20 C, wine yeast and a Brix typical for each style. Your calculator result adjusts these baselines for your actual conditions.

    Wine type Typical Brix Primary (days) Secondary (days) Total
    White grape 20-24 5-10 21-35 4-6 weeks
    Red grape 22-26 7-14 28-42 5-8 weeks
    Apple wine / cider 10-16 5-10 14-28 3-5 weeks
    Plum wine 18-24 8-14 28-42 5-8 weeks
    Cherry / currant 18-22 10-18 35-56 6-10 weeks
    Mead (hydromel) 24-32 14-30 60-120 3-5 months

    Practical examples

    Example 1: White grape wine, 22 Brix, 20 C, wine yeast (Lalvin QA23)
    Result: primary 7 days, secondary 25 days, total 32 days (~4.6 weeks). Potential ABV: 13.0%
    Example 2: Apple cider, 12 Brix, 18 C, wine yeast
    Result: primary 5 days, secondary 14 days, total 19 days (~2.7 weeks). Potential ABV: 7.1%
    Example 3: Cherry wine, 20 Brix, 22 C, wine yeast
    Result: primary 11 days, secondary 36 days, total 47 days (~6.7 weeks). Potential ABV: 11.8%
    Example 4: Mead (semi-sweet), 28 Brix, 20 C, wine yeast (71B)
    Result: primary 23 days, secondary 97 days, total 120 days (~4 months). Potential ABV: 16.5%
    Example 5: Red grape wine, 24 Brix, 14 C, bread yeast
    Result: primary 19 days, secondary 65 days, total 84 days (~12 weeks). Bread yeast may stall at 8-10% ABV with 14.2% potential.

    FAQ - Frequently asked questions

    How do I know when primary fermentation is over?
    Airlock activity slows to one bubble every 30-60 seconds or less. Take a hydrometer reading - if SG has dropped significantly from the original (typically to 1.010-1.020 for wines) and the rate of change is slowing, primary is ending. Two identical readings 24 hours apart confirm it.
    My wine stopped fermenting early. What should I do?
    A stuck fermentation can be caused by: low temperature (warm it to 20-22 C), nutrient deficiency (add DAP or Fermaid-K), high alcohol (yeast hit its tolerance limit) or pH too low (below 3.0). Try gently swirling the carboy to resuspend yeast. If nothing works, pitch a fresh starter of a high-tolerance strain like EC-1118.
    When should I rack (transfer) wine off the sediment?
    First racking: 1-2 weeks after primary fermentation ends, when heavy sediment (gross lees) has settled. Second racking: 4-6 weeks later, when fine lees have settled. Leaving wine on gross lees too long (more than 3-4 weeks) risks off-flavors from autolysis (yeast cell breakdown).
    Does higher temperature always mean faster fermentation?
    Yes, up to a point. Yeast activity roughly doubles for every 10 C increase. But above 28-30 C, yeast stress produces fusel alcohols (harsh, solvent-like) and volatile acids. White wines benefit from cooler fermentation (15-18 C) which preserves delicate aromas. Red wines handle 22-25 C well for color and tannin extraction.
    Can I use bread yeast for wine?
    You can, but results are inferior. Bread yeast tolerates only 8-10% ABV (wine yeast reaches 14-18%), produces more off-flavors, and foams excessively. It also lacks the enzymatic activity that wine yeast uses to develop varietal character. For best results, use a dedicated wine strain: Lalvin EC-1118 (versatile, high tolerance), 71B (fruity, good for berry wines) or K1-V1116 (competitive, fast start).
    Why does mead take so much longer than fruit wine?
    Honey is almost pure sugar with no nitrogen, vitamins or minerals that yeast needs to reproduce. Without nutrient supplements (DAP, Fermaid-O), yeast multiplies slowly and fermentation can stall. High Brix (24-32 for traditional mead) also means more sugar to process. Adding yeast nutrients in staggered doses (day 0, day 2, day 5) can cut mead fermentation time by 30-40%.

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    See also

    10 Brix Wine - How Long to Ferment?12 Brix Wine - How Long to Ferment?14 Brix Wine - How Long to Ferment?16 Brix Wine - How Long to Ferment?18 Brix Wine - How Long to Ferment?20 Brix Wine - How Long to Ferment?22 Brix Wine - How Long to Ferment?24 Brix Wine - How Long to Ferment?26 Brix Wine - How Long to Ferment?28 Brix Wine - How Long to Ferment?

    Calculator verified by the LiczGrupa.pl team

    Content, formulas and results have been reviewed for accuracy and relevance by our team of specialists.

    Natalia Skrzek

    Reviewed by: Natalia Skrzek

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