Sourdough Feeding Ratio
Split a sourdough build into its flour, water and starter parts.
About Sourdough Feeding Ratio
The ratio relates the water and carried starter to a single unit of flour, so a 1:1:1 build is simple to scale. Feed ratio controls how acidic a starter turns; stiffer, larger-feeding styles keep it milder between bakes.
Formula
Sourdough Feeding Ratio
Feed hydration = water / flour; ratio = 1 : water/flour : starter/flour
- 1 : 1 : 1
- Equal flour, water and starter, the classic daily feed
Worked example
With the default values below, Sourdough Feeding Ratio returns Feed Hydration of 100.0%. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Flourminimum 1 g
- 50 g
- Waterminimum 0 g
- 50 g
- Starter carriedminimum 0 g
- 50 g
Results
- Feed Hydration
- 100.0%
- Ratio (1 : Water : Starter)
- 1 : 1 : 1
- New Starter
- 150.0 g
Step by step
- 1Values used
- 2Sourdough Feeding Ratio
- 3Feed Hydration= 100.0
- 4Ratio (1 : Water : Starter)= 1 : 1 : 1
- 5New Starter= 150.0 g
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Sourdough Feeding Ratio calculated?
Feed hydration = water / flour; ratio = 1 : water/flour : starter/flour The ratio relates the water and carried starter to a single unit of flour, so a 1:1:1 build is simple to scale.
Why does Sourdough Feeding Ratio matter?
Feed ratio controls how acidic a starter turns; stiffer, larger-feeding styles keep it milder between bakes.
What values do I need to enter?
This calculator takes 3 inputs: Flour, Water, Starter carried. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.