# Preferment Calculator

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

[Open this tool](https://whatson.pk/preferment-calculator/)

Category: Cooking & Baking

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 (g). Allowed range: 0.001 to 10000000
* Overall water / flour (%). Allowed range: 0 to 200
* Salt / total flour (%). Allowed range: 0 to 100
* Prefermented flour (%). Allowed range: 0 to 100
* Preferment water / flour (%). Allowed range: 0.1 to 500
* Yeast / preferment flour (%). 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 (UTC): 2026-10-01T16:12:30+00:00

This profile describes the tool. It does not execute it or supply a professional certification.