Retained starter
Feed ratio by mass · g
Allowed range: 0.001 to 10000000
Sourdough Starter Feeding Calculator
Calculate feed amounts from retained starter and feeding ratios.
Open this toolRetained starter already contains flour and water. A feeding calculation needs that starting composition as well as the fresh feed.
Enter the seed amount, hydration and chosen feeding ratio. Compare the fresh flour and water with the resulting total starter.
Inputs and controls
Starter parts
Feed ratio by mass · parts
Allowed range: 0.001 to 1000
Flour parts
Feed ratio by mass · parts
Allowed range: 0.001 to 1000
Water parts
Feed ratio by mass · parts
Allowed range: 0 to 1000
Retained starter hydration
Existing starter · %
Allowed range: 0.1 to 500
How to use
- Enter retained starter, starter parts, flour parts and water parts.
- Enter retained starter hydration.
- Select Calculate result. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.
Why use this tool
Including the retained seed gives a clearer final hydration figure than calculating only the newly added ingredients.
Before relying on the result
The final hydration includes flour and water already in the seed. Feeding ratios do not predict readiness time or starter health.
Tool limitations
The final hydration includes flour and water already in the seed. Feeding ratios do not predict readiness time or starter health.
Questions
Does the ratio tell me when the starter will be ready?
No. Temperature and starter condition affect readiness. The result is a feed quantity, not a fermentation timer.
What should I check before using Sourdough Starter Feeding Calculator?
Check Retained starter, Starter parts, Flour parts and Water parts. Use the exact units shown beside the controls and replace any example values with your own inputs.
Source page last modified: 2026-10-01T16:12:30+00:00. This profile describes the tool; use its page to run it.
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