Preferment calculator
Split flour and water among seed starter, preferment feed and final dough without counting anything twice.
The starter is modeled as flour plus water. Impossible flour or water budgets are rejected. Maturity, yeast additions and fermentation timing are not predicted. Change the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.
Your result
How to use Preferment calculator
- Enter the measurements and assumptions for this recipe or plan.
- Review the calculated quantities and their stated basis.
- Download the report and verify it against your measured result.
Useful next steps
Allocate the prefermented flour
Choose total recipe flour, overall hydration, the fraction of flour prefermented and ripe preferment hydration. The final dough receives only what remains after the preferment.
Include the seed in the total
Seed flour and water are already part of the ripe preferment. For the example, 20 g of 100%-hydration seed contributes 10 g of each; feed adds 190 g flour and 190 g water to reach 400 g.
Save the result
Download CSV and a text or JSON report with the calculation and its assumptions. Processing stays on your device. Check measurements and selected units before using the result.