Total Starter After Feed
300g
Water: 100g · Peak: 6-8h
Detailed Guide Coming Soon
We're working on a comprehensive educational guide for the Sourdough Starter Calculator in your language. The content below is shown in English.
What is Sourdough Starter Calculator?
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Welcome to the wonderful, slightly wild world of sourdough baking! If you've ever wanted to bake a rustic, crispy loaf of bread with that signature tangy flavor, you need a sourdough starter. Think of your starter as a tiny, living pet made of just flour and water. It's teeming with wild yeast and friendly lactic acid bacteria that eat the starches in the flour, burp out carbon dioxide gas to make your bread rise, and create those delicious, complex flavors. Keeping this little ecosystem happy and healthy requires a bit of routine feeding, which is where things can get a little confusing for home bakers. That's exactly why we built our Sourdough Starter Calculator. Instead of scratching your head over confusing baker's percentages or guessing how much flour and water to mix into your jar, this tool does the math for you. Whether you are trying to keep your starter alive on your kitchen counter, scaling it up to bake three loaves for a weekend block party, or waking it up after a long nap in the back of your fridge, we've got you covered. It calculates the exact weights you need so you never waste precious flour. In your daily life, this calculator is your ultimate kitchen assistant. It helps you schedule your baking around your busy day—telling you exactly when your starter will be bubbly, active, and ready to bake (what we call "peak activity"). No more waking up at 3 AM to mix dough! By mastering your feeding ratios and hydration, you can control how sour your bread tastes, how fast it rises, and how to keep your starter thriving with minimal waste and zero stress.
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Формула
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Feeding Ratio = Starter Weight : Flour Weight : Water Weight (e.g., 1:2:2 means keeping 1 part starter, and adding 2 parts flour and 2 parts water by weight)
Hydration % = (Water Weight ÷ Flour Weight) × 100
Peak Activity Time at 75°F: ~4–8 hours after feeding (based on a standard 1:5:5 ratio)
Starter in Recipe: 15–20% of total flour weight for a mild flavor; 25–35% for a bold, tangy kickVariable Legend
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| Symbol | Ime | Јединица | Опис |
|---|---|---|---|
| FR | Feeding Ratio | S:F:W | The weight ratio of your starter to the new flour and water you feed it. A higher ratio (like 1:5:5) gives the yeast a massive feast, meaning it takes longer to reach its peak. |
| H% | Hydration | % | How wet your starter is. A 100% hydration starter uses equal weights of flour and water, giving it a thick, pancake-batter texture. |
| PA | Peak Activity | hours after feeding | The sweet spot! This is the time it takes for your starter to bubble up to its maximum height before it starts to deflate. This is when your yeast is strongest and ready to bake. |
How to Sourdough Starter Calculator
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- 1Weigh your clean glass jar on a digital kitchen scale and press the 'tare' button to zero it out.
- 2Keep only the small amount of starter you need for your target ratio, discarding (or saving!) the rest.
- 3Pour in your fresh flour and room-temperature water according to the calculated weights.
- 4Stir everything together vigorously with a spatula or spoon until all the dry flour disappears, pumping fresh oxygen into the mix.
- 5Pop a rubber band around the jar at the starting line so you can easily track how high it rises.
- 6Watch it bubble and double! Use it to bake your bread when it reaches its highest, domed peak.
Worked Examples
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If you want a small, manageable amount of starter on your counter without wasting tons of flour, a 1:2:2 ratio is perfect. You keep just 20 grams of your existing starter, toss the rest, and stir in 40 grams of fresh flour and 40 grams of water. This gives you exactly 100 grams of active starter that will bubble up beautifully in about 3 to 5 hours at a cozy room temperature.
Your bread recipe calls for 200 grams of active starter (often called a 'levain') to ferment 1000 grams of flour. By feeding a tiny 20 grams of starter with 90 grams each of flour and water (a 1:4.5:4.5 ratio to hit 200g), you get exactly 200 grams of bubbly levain. Because the yeast has a huge feast here, it will take about 6 to 8 hours to peak—perfect for feeding before you go to work so it's ready when you get home!
When your starter has been chilling in the fridge for a week, it gets sluggish. To wake it up, give it a quick, equal-parts feeding of 1:1:1. Mix 50 grams of rye flour and 50 grams of warm water with 50 grams of your sleepy starter. Because rye is packed with nutrients, this fast-tracks fermentation and gets the microbial ecosystem active and bubbly again in no time.
Want your starter ready first thing in the morning without waking up in the middle of the night? Use a massive 1:10:10 feeding ratio. By mixing just 10 grams of starter with 100 grams of flour and 100 grams of water, you give the yeast a giant buffet. In a cooler kitchen (68°F), it will take a slow, steady 10 to 14 hours to peak, meaning you can feed it at bedtime and wake up to a perfectly domed jar ready for mixing.
Real-World Applications
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Keeping your daily sourdough starter healthy and active on your kitchen counter with zero flour waste.
Calculating the perfect amount of pre-ferment (levain) for your favorite weekend baking recipes.
Planning your baking schedule so your starter peaks exactly when you are ready to mix your dough.
Reviving a neglected starter that has been sleeping in the fridge for weeks or months.
Special Cases
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The Rye Flour Supercharge
Rye flour is like rocket fuel for sourdough yeast! Because rye grains are packed with wild nutrients, minerals, and natural enzymes, a starter fed with rye flour will ferment much faster and smell incredibly fruity and complex. If your regular wheat starter is feeling a bit sluggish, try giving it a single feeding of rye flour to instantly boost its energy.
Baking in the Summer Heat
Yeast loves warmth, but high temperatures (above 80°F) can cause your starter to ferment at warp speed. If your kitchen is hot and humid, your starter might peak and collapse in just a couple of hours, leaving it runny and hungry. To slow things down, use cooler water, feed it a higher ratio (like 1:10:10), or find a cooler spot in your house to store the jar.
Consistent Measuring is Key
When using our Sourdough Starter Calculator, always use a digital kitchen scale instead of measuring cups. Flour is highly compressible, meaning a cup of flour can vary by up to 50 grams depending on how tightly packed it is. Measuring by weight ensures your hydration is always spot-on, leading to predictable rises and beautiful loaves every single time.
Sourdough Feeding Guide & Timings
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| Feeding Ratio (S:F:W) | Flour Added | Water Added | Hours to Peak (at 75°F) | Best For |
|---|---|---|---|---|
| 1:1:1 | Equal to starter | Equal to starter | 2–4 hrs | Waking up a sleepy starter |
| 1:2:2 | Double starter wt | Double starter wt | 3–5 hrs | Daily kitchen counter upkeep |
| 1:5:5 | 5× starter wt | 5× starter wt | 4–8 hrs | Standard weekend baking prep |
| 1:10:10 | 10× starter wt | 10× starter wt | 8–14 hrs | Overnight rise; cold kitchens |
| 1:20:20 | 20× starter wt | 20× starter wt | 12–20 hrs | Slowing things down for vacation |
| Stiff (1:5:3) | 5× starter wt | 3× starter wt (60%) | 6–10 hrs | Extra-tangy bread flavors |
Frequently Asked Questions
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How long does it take to build a brand-new starter from scratch?
Building a starter from scratch usually takes about 7 to 10 days of daily feedings. In the first few days, you might see a burst of bubbles, but don't be fooled—this is usually wild, non-baking bacteria having a party. Around day 5, the environment inside the jar becomes acidic enough to invite the friendly yeast and lactic acid bacteria to move in permanently. Keep feeding it daily, and by day 10, it will be strong and stable enough to bake bread!
What on earth is 'hydration' and why does it matter?
Hydration is just a friendly baker's term for how much water is in your starter compared to flour. A 100% hydration starter means you are mixing equal weights of flour and water, which is the easiest and most common way to go because it's simple to stir and track. If you use less water, you get a 'stiff' starter, which ferments slower and can give your final bread a much tangier, more complex flavor profile.
How do I actually know when my starter is ready to bake bread?
Your starter is ready to bake when it doubles or triples in size, has a slightly rounded, domed top, and is absolutely packed with bubbles. Another fun trick is the 'float test'—gently scoop a teaspoon of your starter and drop it into a glass of room-temperature water. If it floats like a little cloud, it's full of trapped carbon dioxide gas and ready to leaven your dough!
Do I really have to throw away starter (the discard) every time I feed it?
Yes, discarding is necessary, but you don't have to throw it in the trash! If you don't discard, your starter jar will grow exponentially until it takes over your entire kitchen, and you'll waste bags of flour trying to feed it. Instead, collect your 'discard' in a separate jar in the fridge. It makes the most delicious pancakes, waffles, crackers, and banana bread you've ever tasted!
What is that dark, watery liquid sitting on top of my starter?
Don't panic—that liquid is called 'hooch'! It is actually a natural alcohol that your yeast produces when it runs out of food and gets hungry. It's your starter's way of saying, 'Feed me, please!' You can simply pour it off or stir it right back in for an extra-tangy flavor boost, then give your starter a fresh, healthy feeding.
Common Mistakes to Avoid
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- !Using straight tap water — municipal water often contains chlorine, which is designed to kill bacteria and will unfortunately kill your friendly starter microbes too. Use filtered or spring water instead!
- !Baking when the starter is past its peak — if your starter has already collapsed and looks flat and watery, it has run out of gas and won't have the strength to lift heavy bread dough. Catch it while it's domed and bubbly!
- !Sealing the lid too tightly — active starters release carbon dioxide gas as they eat. If you seal a glass jar airtight, the pressure can build up and crack the glass. Keep the lid loose or use a cloth cover!
- !Forgetting to feed it before putting it in the fridge — always give your starter a fresh meal right before sending it to hibernate in the fridge so it has food to slowly munch on while it sleeps.
Pro Tip
Grab a simple rubber band and wrap it around your starter jar right at the level of your mixture immediately after feeding. This gives you a perfect baseline so you can see exactly when your starter has doubled, tripled, or reached its peak rise!
Did you know?
Did you know that your sourdough starter is a living map of your home? While you buy the flour, the wild yeast and lactic bacteria actually migrate into your jar from the air in your kitchen, the surface of your hands, and even the grain itself. This means your starter is completely unique to you—a loaf baked in your kitchen will taste different than one baked down the street!
References
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