You already have a bread recipe you love. Maybe it’s your grandmother’s sandwich loaf, the focaccia you make every Friday, or a cinnamon roll dough that never fails. The only problem? It leans on a packet of commercial yeast, and your sourdough starter is sitting right there, bubbling away, wanting a job.
Good news: you can almost always rebuild a yeasted recipe on your starter. You don’t need a new recipe or a chemistry degree – you need one swap and two numbers. Here’s exactly how to do it without the guesswork that leaves you with a brick.
The one swap that does the heavy lifting
At its core, converting a recipe means replacing the commercial yeast with a measured amount of active sourdough starter. The starter is just flour and water carrying wild yeast and bacteria, so when you add it, you’re not only swapping the leavening – you’re adding extra flour and water to the dough. That’s the part most people miss, and it’s why conversions go wrong.
A reliable starting point: for a standard loaf (roughly 500g of flour), use 100g of active, recently fed starter and remove the yeast entirely. That 100g is made of about 50g flour and 50g water, so you’ll adjust the rest of the recipe to account for it. More on that in a second.
If your recipe is bigger or smaller, scale the starter to about 20% of the flour weight. It’s a forgiving range – 15% gives a slower, tangier rise; 25% speeds things up a little. You’re not aiming for perfection on the first bake, just a sensible target.
Why you have to weigh, not measure in cups
Here’s the honest truth: cup measurements will fight you on a conversion. Starter is a wet, living thing, and when you add 100g of it, you’re adding real water that changes how the dough feels. If you’re working in cups, that water is invisible – you can’t subtract it, so the dough ends up wetter than you expected and you panic-add flour.
Pull out a kitchen scale and switch the recipe to grams once. It takes ten minutes and it turns conversion from a gamble into arithmetic. Every number below assumes you’re weighing.
Number one: balance the flour and water
Since your 100g of starter brought along 50g of flour and 50g of water, subtract those amounts from the recipe so the dough stays the same consistency as the original.
Say your recipe calls for 500g flour and 325g water. After adding 100g starter, you’d use:
- Flour: 500g − 50g = 450g
- Water: 325g − 50g = 275g
- Starter: 100g
- Salt: keep it the same (usually ~2% of flour, so ~10g here)
That keeps the total flour and water right where the recipe wanted them. If your starter is a stiffer one, the flour/water split inside it changes, but 50/50 is correct for the standard liquid starter most home bakers keep. Don’t overthink this – being within 20-30g is plenty close for a happy loaf.
Number two: throw out the timeline
This is the part that trips up even experienced yeast bakers. Commercial yeast is a sprinter; your starter is a long-distance walker. A recipe that said “rise 1 hour until doubled” might now take 4 to 8 hours at room temperature, sometimes longer in a cool kitchen.
So stop baking by the clock and start baking by the dough. Watch for these instead:
- Bulk rise: the dough should grow by about 50-75% and look puffy and alive, with a few bubbles on the surface – not necessarily fully doubled.
- Final proof: after shaping, give it a gentle poke. A slow, partial spring-back means it’s ready; an instant bounce means give it more time.
Enriched doughs (butter, eggs, sugar – think brioche or cinnamon rolls) rise slower still, because fat and sugar slow the wild yeast down. Be patient, or help it along with a warm spot around 25-26°C.
Handling the dough: fewer muscles, more folds
Many yeast recipes ask for 8-10 minutes of vigorous kneading. With the long sourdough fermentation, you can relax that. A short mix to bring it together, then a few rounds of stretch-and-fold spaced 30-45 minutes apart during the early bulk rise, will build all the strength you need. The extended fermentation does a lot of the gluten development for you.
For softer sandwich and enriched doughs, a few minutes of gentle kneading plus the long rise gives the best of both worlds – structure without a workout.
The fridge is your scheduling superpower
Because sourdough is slow, you can bend it around your life. Mix in the evening, let it bulk rise overnight if your kitchen is cool, or do the opposite: shape the loaf, then park it in the fridge for 8-24 hours before baking. That cold retard deepens flavor and means you can bake fresh in the morning without being up at dawn feeding a dough.
This is where converting a recipe actually makes your baking easier, not harder – you trade a rigid two-hour yeast window for a flexible overnight rhythm.
What to expect from the finished loaf
Your converted bake will be a close cousin of the original, with a few honest differences: a gentle tang, a slightly more open or rustic crumb, and better keeping quality (sourdough stales more slowly). A sandwich loaf will still be soft; a focaccia will still be airy; cinnamon rolls will still be pillowy – just with more character and a longer, friendlier timeline.
If your first attempt comes out a touch dense, you almost certainly under-proofed it – the dough needed more time, not more yeast. Next time, let the bulk rise go longer and watch the dough, not the clock.
Your first conversion, step by step
- Convert the recipe to grams and note the total flour and water.
- Remove the commercial yeast.
- Add active starter at ~20% of the flour weight (100g for a 500g-flour loaf).
- Subtract the starter’s flour and water (half each) from the recipe.
- Keep the salt the same.
- Mix, do a few stretch-and-folds, and bulk rise by feel (50-75% bigger).
- Shape, final proof or cold-retard, then bake as the original recipe directs.
That’s the whole method. One swap, two numbers, and a willingness to let the dough set its own pace.
Want to see a conversion done in real time – from recipe card to finished crumb – plus the dough cues that are hard to describe in words? The full walkthrough lives on the LoafLovers YouTube channel, and our free sourdough troubleshooting guide covers the fixes for when a bake doesn’t go to plan. Grab it, and bake the recipe you love on the starter you’ve grown.
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