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Quick answer
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Live Ferment Timer
Dough temp — how warm your mixed dough feels (use a probe thermometer for accuracy). Inoculation — starter weight divided by flour weight × 100 (e.g. 100g starter in 500g flour = 20%). The timer updates as you type and shows a ±25% window because every kitchen is different. Open Start time, starter, cold retard to: set when you begin bulk fermentation and get a "ready at" clock; adjust for whether your starter is freshly fed, at peak, or hungry; or model a cold retard in the fridge. DoughRise Coach subscribers can record actual bulk times — after 3 bakes the predictions are calibrated to your kitchen, starter, and flour.
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Start time, starter, cold retard
Start time
Hours since fed
After (h)
Retard temp (°C)
Duration (h)
h
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The fermentation calculator
for precise bulk rise timing
Quick answer
Bulk fermentation time roughly halves for every 10°C rise in dough temperature, and scales inversely with yeast percentage. At the baseline of 0.2% yeast and 20°C, bulk takes about 12 hours; at a warmer 24°C it drops to roughly 9 hours.
The dough fermentation calculator takes your flour weight, hydration, yeast percentage, salt percentage, and room temperature, then outputs a bulk fermentation window and a proofing estimate adjusted for your exact conditions. No guessing, no generic ranges.
Fermentation is where most bread goes wrong. Too short and the dough lacks structure and flavour. Too long and the gluten degrades, leaving you with a slack, sticky mess that won't hold its shape. The difference between the two is often just an hour or two, and that window shifts every time the temperature changes. For the full science of what happens as your dough rises, our dough rise guide covers times, temperature and troubleshooting.
The calculator uses the Q10 rule, a standard biochemistry principle that describes how enzyme and yeast activity changes with temperature. For every 10°C rise in temperature, fermentation speed roughly doubles. This means a dough at 26°C ferments in about half the time it would at 16°C. Enter your numbers and the calculator does the maths.
The calculator adjusts precisely for your own yeast percentage and hydration.
Q10
Temperature rule applied
5
Variables per calculation
0.05%
Minimum yeast percentage
How It Works
How the fermentation calculator actually predicts your timing
Behind the numbers, the calculator runs on two levers stacked on top of a fixed baseline. That baseline is 12 hours of bulk fermentation at 0.2% yeast and 20°C, roughly what a lot of UK kitchens sit at through spring and autumn. Change the temperature and it applies the Q10 rule: fermentation speed roughly doubles for every 10°C you go up, and halves for every 10°C you drop. Change the yeast percentage and the relationship is a straight inverse: double the yeast and you halve the time; halve the yeast and you double it. Both effects stack, so a warm kitchen and a heavier yeast dose compound quickly, sometimes turning a planned overnight bulk into something ready before you’ve finished your coffee.
Proofing time is calculated as a fraction of bulk, not a fixed number, because the dough’s already partly developed by the time it’s shaped. Below 24°C the calculator uses 25% of your bulk time as the proof window; above that it drops to 20%, since warmer dough proofs proportionally faster once it’s had a head start from a warm bulk. There’s also a floor of 30 minutes on both bulk and proof, so even an aggressive combination of high yeast and high heat won’t hand you an unrealistic four-minute rise. None of this replaces watching the dough itself. Treat the clock as your starting point and the poke test as your final word, because two kitchens at the same thermostat reading rarely ferment identically.
Worked example: an evening bulk from a Tuesday-night mix
Say you’re mixing dough after work, 500g flour, 70% hydration, 0.3% yeast, 2% salt, kitchen sitting at a fairly ordinary 21°C.
- Water: 500g × 70% = 350g
- Yeast: 500g × 0.3% = 1.5g. Salt: 500g × 2% = 10g
- Total dough weight: 500g + 350g + 1.5g + 10g = 861.5g
- Bulk fermentation: the 12-hour baseline adjusted for 0.3% yeast and 21°C works out to roughly 7.5 hours
- Proof (21°C is under the 24°C cutoff, so 25% of bulk): roughly 1.9 hours
- Total from mix to bake: roughly 9 hours 20 minutes
Mix at 7pm and you’re shaping around half past two in the morning, ready to bake by half four, which only really works if you’re after dough for a weekend lunch bake rather than dinner that night. Nudge the yeast to 0.5% instead and the whole thing compresses to under six hours, ready comfortably before bed.
Common fermentation mistakes
Treating room temperature as dough temperature
The calculator asks for room temperature, but what actually drives fermentation speed is the dough’s own temperature, which is often 2 to 4°C warmer than the room straight after mixing thanks to friction from kneading or stand-mixer work. Measure the dough itself with a probe thermometer once it’s mixed, not the kitchen. Over a nine-hour bulk, a few degrees of difference compounds into finishing an hour or more earlier than the calculator suggested.
Underestimating how much a small yeast change moves the clock
Because yeast and time are inversely related, nudging your yeast up from 0.2% to 0.4% doesn’t shave a bit off your schedule, it halves your bulk time outright. A ‘pinch more’ yeast when you’re in a rush changes your schedule more than most bakers expect. Adjust in small steps and re-check the calculator rather than guessing.
Confusing the end of bulk with a finished dough
Bulk fermentation and proofing are two separate stages with two separate numbers on this calculator, and skipping straight from bulk to the oven misses the shaped proof entirely. Shape your dough once bulk is done, then give it the calculator’s proof window before baking. Rush that second stage and the loaf springs unevenly in the oven, or worse, collapses because the yeast hadn’t finished building structure in its final shape.
Frequently Asked
Questions about
dough fermentation
How long does bulk fermentation take?
Bulk fermentation typically takes 4 to 12 hours depending on three factors: yeast percentage, room temperature, and hydration. At 0.2% instant yeast and 22°C, expect 8 to 10 hours. At 1% yeast and 24°C the same dough might be ready in 2 hours. The fermentation calculator uses the Q10 rule (fermentation rate roughly doubles every 10°C) to give you a precise estimate for your specific inputs rather than a generic range.
How does temperature affect fermentation speed?
Temperature is the single biggest lever in fermentation speed. Yeast activity roughly doubles for every 10°C increase in temperature. A dough fermenting at 26°C will be ready in about half the time it would take at 16°C. This is why cold retarding in the fridge (3 to 5°C) can extend bulk fermentation to 16 or even 24 hours, giving you flavour development without over-proofing.
What yeast percentage should I use for sourdough bread?
Commercial yeast levels in bread recipes range from 0.1% to 1% of flour weight. Use 0.1 to 0.3% for long, slow fermentations with more flavour development (10 to 16 hours). Use 0.5 to 1% when you need results in 2 to 4 hours. Many recipes use sourdough starter as the leavening instead, in which case 15 to 20% starter (relative to flour) is a common starting point, giving a 6 to 10 hour bulk at room temperature.
How do I know when bulk fermentation is actually finished?
The calculator gives you a time estimate, but the dough itself is the final word. Look for a 30 to 75% increase in volume depending on your recipe, a slightly domed and jiggly surface, and visible bubbles at the edges of the container. The poke test is the most reliable check: press a floured finger about a centimetre into the dough. If it springs back slowly and leaves a slight indent, it’s ready. If it springs back instantly, give it more time; if it doesn’t spring back at all, it’s overproofed.
Can I slow fermentation overnight in the fridge?
Yes, this is called cold retarding and it’s one of the most useful tricks in home baking. Dropping dough to fridge temperature (3 to 5°C) extends bulk fermentation to 16 to 24 hours, which develops more flavour without the risk of over-proofing on the counter. Mix your dough in the evening, pop it straight in the fridge, and shape the next day when it suits you rather than the clock.
Why did my dough over-ferment even though I followed the calculator’s time?
The calculator works from your room temperature reading, but real kitchens have hot spots: near an oven that’s been on, on a sunny windowsill, or above a fridge motor can all run several degrees warmer than the rest of the room. A few degrees over a long bulk compounds fast under the Q10 rule. If this keeps happening, DoughRise Coach lets you log your actual bulk times, and after a few bakes it calibrates predictions to your specific kitchen, starter and flour rather than a generic estimate.
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