Sourdough Hydration Calculator

Sourdough Hydration: enter your numbers to calculate the result instantly. Starter contributes both flour and water. Other liquids and flour moisture are excluded.

Your Numbers

Added flour (g)

Added water (g)

Starter weight (g)

Starter hydration (%)

Results

Total hydration (%)—

Input check—

Results update live as you type. Estimates only — not financial, tax, or investment advice.

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The Formula

Hydration = (added water + starter water) ÷ (added flour + starter flour) × 100

Understanding the Sourdough Hydration Calculator

500 g flour, 350 g water and 100 g of 100%-hydration starter give 72.73% total hydration.

Starter contributes both flour and water. Other liquids and flour moisture are excluded.

Frequently Asked Questions

How is the result calculated?

Hydration = (added water + starter water) ÷ (added flour + starter flour) × 100

What assumptions should I check?

Starter contributes both flour and water. Other liquids and flour moisture are excluded.