The Sourdough Calculator is a free, no-login tool built for home bakers who are tired of doing baker's math by hand. Whether you found a recipe that makes too much dough, want to dial in a different hydration, or your starter is a different percentage than the recipe assumes — this calculator handles it all in real time.
Sourdough baking has a steep learning curve, and baker's math makes it steeper. Most online calculators do one thing — scale a recipe, or calculate hydration — but not the full workflow a real baker needs. We wanted a single tool that handles it all, works on mobile, and doesn't require signing up for anything.
Yes. The calculator uses standard baker's math — every calculation is based on flour weight as 100%. The starter hydration conversion accounts for the flour and water inside your starter, not just the grams you add — so the effective hydration shown is the true hydration of your final dough.
This tool is free to use, forever. It's supported by the ads you see on the page. No paywalls, no sign-up, no premium version.
🧮 Open the calculator