Sourdough Hydration Calculator
Calculate dough hydration percentage, including your starter. This free online cooking & kitchen calculator runs entirely in your browser — no signup, no data sent anywhere.
Inputs
Results
How It Works (Formula & Method)
Baker's hydration is total water divided by total flour, as a percentage. A 100%-hydration starter is half flour and half water by weight, so this tool splits the starter into its flour and water and adds them to the dough before computing the ratio.
Worked Example
Below is a worked example using the calculator's default values. The same numbers are pre-filled in the form above so you can press Calculate and see the result without typing anything.
Inputs used:
- Flour (g): 500
- Water (g): 350
- Starter (g): 100
- Starter Hydration (%): 100
With these inputs, the calculator computes the metrics shown in the Results panel. Change any value and press Calculate again to see how the result responds — the live widget and the chart both update instantly.
Frequently Asked Questions
What does the Sourdough Hydration Calculator compute?
The Sourdough Hydration Calculator takes 4 input values and returns 3 results. Calculate the hydration percentage of a sourdough (or any bread) dough, including the flour and water contributed by your starter.
Is my data sent to a server?
No. The Sourdough Hydration Calculator runs entirely in your browser using static JavaScript. Your inputs are never transmitted to CalculatorHive or any third party, and nothing is stored after you close the page.
Is this calculator free to use?
Yes. Every calculator on CalculatorHive is completely free. There is no signup, no paywall, and no usage limit. The site is supported by display advertising and affiliate partnerships, which are clearly labeled.
How accurate is the result?
The math is mathematically exact for the inputs you provide. Real-world accuracy depends on how accurately your inputs reflect the real situation — defaults are typical values, not guarantees.