# Sourdough Baker’s Calculator

- URL: https://levainpct.pages.dev/
- Type: free in-browser web tool
- Price: US$0 / KSh 0
- Android app: coming soon (planned as a free app with an optional paid starter log). This web tool remains free.

## What it does

Calculates a sourdough dough from baker’s percentages:

- Total flour is 100%. Hydration, salt and levain are percentages of that flour weight.
- Two levain methods: (1) formula method — levain is part of total flour and water, so overall hydration stays as set; (2) on-top method — a separately built levain is added after flour, water and salt, and true hydration is shown.
- Scales a formula by a factor, or starts from a target dough weight.
- Feeding schedule: given a starter:flour:water ratio, hours to peak, mix time and a reserve amount, it tells you when to feed and how many grams of starter, flour and water to use so the levain is ready for the mix.

All arithmetic runs in the browser. Nothing is uploaded.

## How to use

1. Choose whether to start from total flour weight or a target dough weight.
2. Set hydration, salt, levain percentage and levain hydration (typically 100%).
3. Weigh the “bowl flour” and “bowl water” amounts, plus salt and the ripe levain.
4. Use the feeding section to build that levain in time for your mix.

## Limits

Weights are rounded to 0.1 g, displayed to 1 g when whole. Feeding times assume the peak window you enter; room temperature changes how fast a starter rises. This is a home-baking aid, not a commercial bakery specification.