Starter feeding ratio calculator
Enter the total amount of starter you want to end up with and the feeding ratio you prefer. The calculator will break that into seed starter, fresh flour, and water - so you always know exactly what to mix.
This is the amount your recipe needs - plus a little extra if you like to keep some aside.
Common values: 1:1:1, 1:3:3, 1:5:5. Higher flour = slower, milder starter.
Enter a total amount and a feeding ratio to see your breakdown.
How to use this calculator
Start by entering the total amount of starter you want ready - usually what your recipe calls for, plus a little extra if you like to keep some aside for the next feed.
Then choose your feeding ratio as three numbers: starter, flour, and water. A 1:1:1 feed is equal parts of everything and tends to peak quickly. A 1:4:4 or 1:5:5 feed gives your starter more fresh food, leading to a slower rise and a milder flavor.
Starter ratio by timeframe
If you’re unsure which ratio to use, this tool helps you choose based on when you want your starter to peak. Select a timeframe, and the calculator suggests a ratio that typically peaks in that window for an active starter at room temperature.
Enter how much active starter you want ready for your recipe.
Choose when you want your starter to peak. The calculator suggests a ratio that usually fits that window.
Enter a total amount above to see your feeding plan.
How to use this calculator
Enter how much starter you want ready, then choose a timeframe that matches when you want your starter to peak - such as 4-6 hours, 6-8 hours, or 10-12 hours.
These estimates assume a healthy, active starter in a kitchen around 24°C / 75°F. If your home is cooler, your starter may take longer to peak; if it’s warmer, it may peak sooner.
What is a sourdough feeding ratio?
A feeding ratio describes the relationship between the amount of seed starter you keep and the fresh flour and water you add to it. Written as three numbers - starter : flour : water - it tells you how much “food” your starter has and how long it will take to rise and peak.
A 1:1:1 feed is balanced and active. A 1:3:3 feed slows things down. A 1:5:5 feed gives your starter a long runway and often produces a milder, less acidic flavor.
Adjusting for your kitchen and starter
Every starter behaves differently. Temperature, flour type, hydration, and starter strength all influence how quickly it rises and falls. Use these calculators as a starting point, and let your own observations guide adjustments over time.