Sourdough Calculators & Baking Tools — Free
Sourdough Calculators & Baking Tools
Six free tools for sourdough bakers — from feeding ratios to bulk fermentation timing to starter diagnostics. No apps, no signup, no fluff. Pick the tool you need.
Sourdough Starter Feeding Calculator
Get exact flour and water amounts for any feeding ratio. Temperature-adjusted peak timing. Includes a reverse bake schedule builder.
Feeding Ratios · Bake ScheduleBulk Fermentation Calculator
Enter your dough temperature, starter %, and hydration. Get an estimated bulk fermentation time with a live countdown timer and progress tracker.
Timing · Temperature · Live TimerSourdough Recipe Scaler
Scale any sourdough recipe to any number of loaves or target dough weight. Calculates baker's percentages for every ingredient automatically.
Recipe Scaling · Baker's MathWater Temperature Calculator (DDT)
Calculate the exact water temperature you need for your target dough temperature. Adjusts for air temp, flour temp, starter temp, and mixer friction.
Desired Dough Temp · DDTCups to Grams Converter
Convert sourdough starter, discard, flour, and water from cups to grams — or reverse. Includes active starter and discard with correct densities.
Unit Conversion · Starter · DiscardStarter Troubleshooter
Answer 2–3 questions about your starter's smell, rise, and appearance. Get an instant diagnosis and exact steps to fix it.
Diagnostic · Won't Rise · SmellsThe best tool is a starter that just works.The Mother is a 288-year-old heritage culture — pre-fed, active, and ready to bake on arrival. Every tool above was built to help you use it.
Get The Mother →Why Every Sourdough Baker Needs These Tools
Sourdough is the most forgiving bread in the world — until it isn't. The margin between a loaf that sings and one that sits like a brick is usually a timing issue, a temperature issue, or a starter issue. These tools exist to close that margin.
The feeding calculator
Most sourdough problems start with feeding. Too little food and the yeast starve out before peak. Too much and the starter never concentrates enough acid to leaven bread properly. The ratio matters. The temperature matters more. The calculator handles both.
The bulk fermentation calculator
Bulk fermentation is where most home bakers lose loaves. They go by the clock ("the recipe says 4 hours") instead of the dough. The clock is a lie — the same recipe takes 3 hours in a hot kitchen and 8 hours in a cold one. The bulk fermentation calculator gives you a temperature-adjusted time range so you're watching for the right signs at the right time, not second-guessing a recipe written for someone else's kitchen.
The recipe scaler
Every sourdough recipe on the internet assumes you're making one specific loaf at one specific hydration. The moment you want to make two loaves, or use your own flour blend, or match the recipe to your banneton size, the math gets messy. The scaler does that math instantly and shows you baker's percentages so you understand what you're actually adjusting.
The water temperature calculator
Professional bakers don't guess water temperature. They calculate a Desired Dough Temperature (DDT) and work backwards from it — because the final dough temperature determines how fast the bulk fermentation runs. The water temp calculator does the same math, adjusted for your specific kitchen conditions and mixer type.
The cups to grams converter
A cup of flour can weigh anywhere from 120g to 160g depending on how you scoop it. A cup of sourdough starter weighs differently than a cup of water. Volume measurements in sourdough are a source of failure, full stop. This converter is for the moments when you have a recipe written in cups and you want to bake it with precision.
The starter troubleshooter
Starter problems look random but they're not. Pink color means contamination. Acetone smell means it's hungry. No rise in a new starter means chlorinated water or cold temperature. The troubleshooter is a 2–3 question diagnostic tree that identifies the problem and gives you numbered steps to fix it — no Reddit rabbit holes required.