Preferment Calculator

Divide an entered flour and water formula into preferment and final mix.

A preferment moves part of the recipe's flour and water into an earlier mix. The final dough still needs a balanced ingredient total.

Set the preferment share and hydration, then inspect the ingredients left for the final mix. Apply the entered yeast rate on its stated flour basis.

Inputs and controls

Total flour

Whole formula · g

Allowed range: 0.001 to 10000000

Overall water / flour

Whole formula · %

Allowed range: 0 to 200

Salt / total flour

Whole formula · %

Allowed range: 0 to 100

Prefermented flour

Preferment formula · %

Allowed range: 0 to 100

Preferment water / flour

Preferment formula · %

Allowed range: 0.1 to 500

Yeast / preferment flour

Preferment formula · %

Allowed range: 0 to 100

How to use

Enter total flour, overall water / flour and salt / total flour.
Enter prefermented flour, preferment water / flour and yeast / preferment flour.
Select Calculate result. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.

Why use this tool

The division keeps the earlier mix visible while preserving the overall flour and water plan.

Before relying on the result

Yeast applies only to preferment flour in this worksheet. No further final mix yeast is inferred and no fermentation schedule is supplied.

Tool limitations

Yeast applies only to preferment flour in this worksheet. No further final mix yeast is inferred and no fermentation schedule is supplied.

Questions

Is additional final mix yeast supplied?

No. The worksheet calculates yeast for preferment flour only. Enter any further recipe requirement separately.

What should I check before using Preferment Calculator?

Check Total flour, Overall water / flour, Salt / total flour and Prefermented flour. Use the exact units shown beside the controls and replace any example values with your own inputs.

Source page last modified: 2026-10-01T16:12:30+00:00. This profile describes the tool; use its page to run it.

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