Sourdough Calculator
Know exactly when — and how much — to feed
Stop guessing. Enter when you last fed your starter and when you need it ready. Get a clear feeding schedule with ratios, amounts, and peak times that fit your kitchen.
Create a Free AccountFree account · Instant access to the calculator
What you'll get
A day-by-day feeding plan for your starter
Progressive build-up to bake day, optional maintenance feeds in between, and ready-by timing you can trust — all in your member library.
Feeding math, without the spreadsheet
Your starter's timing depends on when you last fed, how warm your kitchen is, and when you want to bake. The calculator turns that into a practical schedule you can follow.
Work backwards from bake day
Tell us when you need starter ready. We build the progressive feeding plan from that deadline.
Exact amounts & ratios
See starter, flour, and water for every feed — sized to the amount you want on hand.
Maintenance between now and then
If bake day is a ways out, get daily maintenance feeds so your starter stays strong without overlapping the build.
Fits your flour & temperature
White or whole wheat, cooler or warmer kitchen — peak windows adjust so timing stays realistic.
Start in minutes
Create a free account to unlock the calculator in your library. No credit card required.
Sign in with Google or email — then you're in.
Bakers love the clarity
“I used to guess my feedings and wonder why my starter was sluggish. This schedule finally matched my bake day.”
Jamie L.
Weeknight baker
“Told it when I last fed and when I needed dough ready. Got exact amounts and times — no more math at midnight.”
Chris P.
New to sourdough
“The maintenance days between now and bake day were the missing piece. My starter is ready when I am.”
Nina S.
Busy parent
Why use it?
Less guesswork
Clear times and grams instead of vibes-based feeding.
Bake-day ready
Plan backwards from when you actually need peak starter.
Free to start
Account is free. Use the calculator whenever you need a plan.
Frequently Asked Questions
Quick answers before you dive in.
Is the calculator really free?
Yes. Create a free account and you can build feeding schedules anytime. Calculator Pro ($3.99/mo) unlocks SMS text reminders, PDF export, email, and saved presets.
Do I need baking experience?
No. If you know when you last fed your starter and when you want it ready, the calculator handles ratios, peak times, and step-by-step amounts for you.
What do I need to use it?
A free account, your last feeding info, a target ready time, flour type, and roughly how much starter you want. That's it.
Will it work with my kitchen temperature?
Yes. You pick a room temperature and the schedule adjusts peak times so feedings line up with when you actually need to bake.