Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Crafters, Makers & DIY
Sourdough Starter Hydration & Discard Calculator
Water = flour × hydration%; discard = starter × discard %.
Compute water, starter, and discard from flour and hydration %. Planning estimates only — verify measurements independently.
Inputs
1002000
50120
550
0100
Smart analysis
Recommendations
Tailored to your live inputs and result—guidance only, not professional advice.
- Interpret
Treat this as a planning estimate
Primary result: Water = 375 g. Re-run with optimistic and pessimistic inputs to understand the range—not just a single point.
Scenario studio
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Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Flour (g)
The “Flour (g)” value used in this tool’s formula. Adjust it to see results update live.
Hydration (%)
The “Hydration (%)” value used in this tool’s formula. Adjust it to see results update live.
Starter % of flour
The “Starter % of flour” value used in this tool’s formula. Adjust it to see results update live.
Discard % of starter
The “Discard % of starter” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
Compute water, starter, and discard from flour and hydration %. Planning estimates only — verify measurements independently. Water = flour × hydration%; discard = starter × discard %. Example: 500 g flour at 75% hydration → 375 g water (estimate).
Water = flour × hydration%; discard = starter × discard %.
Example: 500 g flour at 75% hydration → 375 g water (estimate).
When to use this Sourdough Hydration & Discard
Common use cases
- Compute water, starter, and discard from flour and hydration %.
- Sanity-check with this case: 500 g flour at 75% hydration → 375 g water (estimate).
- The relationship is: Water = flour × hydration%; discard = starter × discard %.
Localized examples
- Crafters, Makers & DIY: the example on this page uses the same formula as the widget.
What you get
- Fields: Flour (g), Hydration (%), Starter % of flour, Discard % of starter
- Water = flour × hydration%; discard = starter × discard %.
- Example on the page: 500 g flour at 75% hydration → 375 g water (estimate).
How to Calculate Sourdough Hydration & Discard Step-by-Step
- 1Enter Flour (g), Hydration (%), Starter % of flour, then the remaining fields. Use the values you have, not a catalog average, unless that is all you know.
- 2Water = flour × hydration%; discard = starter × discard %.
- 3Worked case: 500 g flour at 75% hydration → 375 g water (estimate).
- 4Order a little extra. Resin, fabric, and clay do not read a spreadsheet.
Governing formula
Water = flour × hydration%; discard = starter × discard %.
500 g flour at 75% hydration → 375 g water (estimate).
Example: set Flour (g) = 500, Hydration (%) = 75, Starter % of flour = 20, then read the result.
Variable definitions
- flourGrams
Flour (g)
The “Flour (g)” field. Default 500; typical range 100–2000.
- hydrationPct
Hydration (%)
The “Hydration (%)” field. Default 75; typical range 50–120.
- starterPct
Starter % of flour
The “Starter % of flour” field. Default 20; typical range 5–50.
- discardPct
Discard % of starter
The “Discard % of starter” field. Default 50; typical range 0–100.
- Volume math (Water = flour × hydration%; discard = starter × discard %.) does not include your waste, test pour, or the batch that cures wrong. Add a buffer.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
Water = flour × hydration%; discard = starter × discard %.
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Community
Reviews & Ratings
See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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