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Fermentation Time Calculator

Estimate fermentation time for sourdough, kombucha, kraut and more using the Q10 rule.

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Open Fermentation Time Calculator and you get an answer straight away, with no account to create. It sits under Cooking & baking in our catalogue, alongside Marinade Time Calculator and Turkey Cooking Time Calculator.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What does Fermentation Time Calculator do?

Estimate fermentation time for sourdough, kombucha, kraut and more using the Q10 rule.

When would I actually use this?

Cooking from a recipe that does not match your kitchen: scaling for a different number of people, converting cups to grams, and substituting what you do not have.

What is the most common mistake?

Converting a cup as if it were a volume of weight. A cup of flour and a cup of sugar differ by nearly a third in mass, so a single conversion factor gets one of them badly wrong.

How is Fermentation Time Calculator different from Marinade Time Calculator?

They sit next to each other but answer different questions: Marinade Time Calculator is the one to open when you need it to find the right marinating window for any cut, adjusted for thickness and marinade acidity. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Turkey Cooking Time Calculator is the closest one after this: Work out the cooking time, resting time and when to start so the turkey lands right on serving time.

What else is worth having open alongside it?

Meat cooking time calculator and Turkey thawing time calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

Volume-to-weight factors are per ingredient, because density is. Cooking times assume a conventional oven at the stated temperature; fan ovens run hotter and need roughly twenty degrees less.

Further reading

All guides →
GuideYeast Conversion Chart: Fresh, Active Dry and Instant, With the Actual FactorsMultiply fresh yeast by 0.4 for active dry and by 0.33 for instant. Those two numbers are the whole chart, they are King Arthur's professional figures, and they are approximate — here is how far, and what else changes when you swap.GuideThe Sourdough Timeline: An Hour-by-Hour Schedule That Fits a Real DayA full schedule from feeding the starter to slicing the loaf, and the one variable that moves every time on it. Five hours of bulk at 75 °F becomes about seven and a quarter at 68 °F.How-toHow Long to Thaw a Turkey (Safely, Every Time)Fridge thawing needs about 24 hours per 4 to 5 lb; the cold-water method is faster. Follow food-safety rules to avoid bacteria.How-toHow to Brine Meat: The Two Methods, and Why a "6 % Brine" Is an Ambiguous InstructionA conventional wet brine is 5 to 6 percent salt by weight of the water and you pull the meat out on a timer. An equilibrium brine is 1 to 2 percent by weight of the meat and water together, and it cannot over-salt. Those are different numbers doing different jobs.ExplainerBaker's Percentage Explained: One Formula, Any Batch SizeFlour is 100 percent and everything else is measured against it. That one convention lets the same recipe scale from a single loaf to a bakery batch without a single new calculation — and yes, the percentages are supposed to add up to more than 100.How-toHow to Convert Any Oven Recipe for an Air FryerDrop 25 °F and cut the time by about a fifth — then adjust for what the food is and how full the basket is, because those two change the answer more than the rule does.