The Sourdough Calculator
Feeding ratios on the house. The full kit — hydration, recipe builder, saved starter profiles, unit conversions — lives in the app.
Tell us how much fed starter you want at the end, and we'll work backward to the gram.
The everyday workhorse ratio. The starter doubles in 6–8 hours at room temperature — perfect for once-a-day feeding on a kitchen counter. Predictable timing, balanced flavor, easy to plan a bake around.
Discard whatever's left in the jar (or save it for discard recipes). Combine these three weights, stir well, and leave to ferment until peak.
The full calculator — hydration, recipe builder, saved recipes, unit conversions — is in the app.
Plus per-starter profiles so the calculator already knows your ratios.
No subscription. No ads. Yours forever.
Why baker's percentages?
In baker's math, flour is always 100%. Everything else — water, salt, levain — is a percentage of the flour weight. A 75% hydration loaf at 500g flour has 375g water. Same ratios at 1kg flour: 750g water. Same dough, twice the bread.
Once you think in percentages, you can read any recipe from any baker and know what to expect — and write your own from first principles.