Sourdough Starter Feeding Calculator

Use this calculator to find out how much flour and water to add to your sourdough starter. Choose a feeding ratio from 1:1:1 to 1:5:5 and see the usual time it takes to reach peak activity.

SOURDOUGH TOOLS

YOUR FEEDING

Start here

This calculator is for a 100% hydration starter: equal parts water and flour.

Starter you have, grams Feeding ratio

ADD TO YOUR STARTER

Starter20 g

Water20 g

Flour20 g

USUAL TIME TO PEAK AT 24–26°C / 75–79°F4–6 hours

A reminder: starter activity changes with temperature, flour and its overall strength. These times are a guide only — use the rise, bubbles and aroma of your starter as the final sign that it is ready.