Free Sourdough Calculators & Tools

What each sourdough calculator does

Twenty free tools, no sign-up. Each opens from the grid above or from a link below. Here is what each does and when you would reach for it.

Starter care, feeding and rescue

• Starter Care Guide — feeding ratios, a peak-rise timeline and a maintenance checklist in one place — the page for your first fortnight with a new culture.
• Starter Hydration Converter — moves a starter between hydration levels, from a stiff 50% levain to a loose liquid one. For recipes that assume a different starter from your jar.
• Starter Revival Wizard — step-by-step diagnosis for a starter that has stopped rising, smells sharp, or was forgotten at the back of the fridge.
• Starter Strength Tracker — logs each feed and charts activity over time, so you can tell real progress from a good week.

Timing, temperature and bake-day planning

• DDT Calculator — the water temperature needed to hit a target dough temperature, from your flour, room and starter readings. The single most useful number in the kitchen.
• Fermentation Temperature Adjuster — rescales bulk fermentation for a kitchen warmer or cooler than the recipe assumed. Reach for it when the seasons turn.
• Bake-Day Timeline Calculator — say when you want bread out of the oven and it works backwards to the hour you feed, mix, shape and chill.
• Multi-Loaf Yield Planner — scales ingredients, bowls, bannetons and oven space for one loaf up to ten.

Scaling and converting recipes

• Recipe Scaler — resizes any recipe to the number of loaves you actually want, keeping the baker's percentages intact.
• Yeast to Sourdough Converter — turns a commercial-yeast recipe into a sourdough one: levain quantity, adjusted flour and water, and a new timeline.
• Bread Maker Converter — rewrites a hand-mixed loaf as bread-machine instructions, with the order to add things and which cycle to choose.
• Discard Reincarnation Engine — takes the weight of discard in your jar and returns four zero-waste recipes, already scaled.

Reading and scoring a finished loaf

• The Crumb Reader — upload a photo and get an honest reading of crust, crumb and fermentation, with the likely cause and the fix. For when a loaf disappoints and you cannot say why.
• Loaf Score Card Generator — rate a bake across five criteria and generate a shareable card. Worth doing monthly.
• Interactive Baking Matrix — what happens inside the dough at every internal temperature.
• Combustion Probe Profile — a precision bake profile for anyone using a Combustion predictive thermometer.

Flour, flavour and plain-English reference

• Hydration Visual Guide — what 65%, 75% and 85% dough look, feel and handle like, so you can judge by eye, not by number.
• Flour Blend Analyst — mix white, wholemeal, rye, spelt or Italian '00' and see predicted gluten strength, water uptake and fermentation speed.
• Flavour and Texture Profiler — answer four questions about the loaf you want and get a protocol tuned to it.
• Sourdough Jargon Decoder — plain-English definitions for levain, autolyse, hooch, banneton, coil fold and the rest.