Sourdough Starter Calculator

Feed by ratio, scale to any batch, and keep your starter’s hydration exactly where you want it.

Mode

Starter you need (grams)

Feeding ratio (starter : flour : water)

Hydration
Hydration = water ÷ flour × 100.

• 100% — standard 1:1:1 (pourable)
• 75–80% — stiff-ish, great for crusty breads
• 50% — firm, easy to handle

Smaller ratios (1:1:1) feed faster; larger (1:4:4) suit a fridge schedule.

🍞 Ratio built in

1:1:1 to 1:4:4 presets.

📐 Hydration control

Know exactly how wet your starter is.

🍖 Discard plans

See how much to toss or bake with.

🔩 Gram accurate

Bakers’ percentages, no guesswork.

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