Starter Manager — Proof & Measure

Your starter

Name

Birth date

Hydration (%)

100% = equal weights of flour and water (most common). Lower is a stiffer starter.

Storage

Saved automatically in this browser only (localStorage). Nothing is sent anywhere.

Feeding calculator

Ratio (starter : flour : water, by weight) 1:1:1 (peaks fastest, ~4–6 h) 1:2:2 (~6–8 h) 1:5:5 (~8–12 h, overnight) Custom Custom ratio

Target total (g) Starter in jar now (g, optional)

Flour blend (saved for the next feeding)

Enter as % of the flour grams

Times to peak are approximate at ~75°F (24°C); warmer is faster, cooler is slower. The flour and water are split by your hydration setting.

Next feeding

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Play the alarm sound when a feeding is due (while this page is open)

Heads up: web pages can't reliably alert you when they're closed or your phone is locked. For a reminder you can count on, use the calendar reminder. It's made right here in your browser, and your calendar app does the alerting.

Optional. Asks your browser for permission only when you click. Where supported (e.g. some Chromium browsers with Notification Triggers) the reminder is scheduled with your device; otherwise it fires only while this page is open.

Feeding log

Feedings (newest first)
When	Ratio	Discard	Peak	Notes	Actions

Discard ideas

Running total discarded: 0 g.

Starter health tips

Backup

Import backup…

Importing checks the file first and asks before replacing your current data.

Sources & notes

All timings are approximate: starters vary with flour, temperature and age. Guidance summarizes King Arthur Baking and The Perfect Loaf.