Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Starter contributes only flour and water in this model. Fermentation timing and microbial activity are not predicted.
Example Calculation
- Total flour in dough: 500 g
- Overall hydration: 70 %
- Starter mass: 100 g
- Starter hydration: 100 %
- Salt relative to total flour: 2 %
500 g total flour at 70% hydration with 100 g of 100%-hydration starter needs 450 g flour, 300 g water and 10 g salt added.
Frequently asked questions
How do I use this calculator?
Enter total flour in dough, overall hydration, starter mass, starter hydration, salt relative to total flour. The result updates automatically. Use Reset to restore the example values.
What method does it use?
starter flour=starter/(1+starter hydration); starter water=starter−starter flour; subtract both from target totals.. Starter contributes only flour and water in this model. Fermentation timing and microbial activity are not predicted.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.