Sourdough starter feeding calculator

Pick a ratio, then enter the starter you're keeping or the total you need. Ratios are by weight, in the order starter : flour : water.

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Ratio

Your feeding · 1:1:1

Starter
50 g
Flour
50 g
Water
50 g
Total
150 g

Hydration: 100%. Water as a share of the flour in this feeding.

How long until it peaks?

In King Arthur Baking's tests at about 78°F (26°C), a 1:1:1 feeding peaked in roughly 4 to 6 hours.

Bigger ratios take longer to peak, and a warmer spot is faster. Learn your own starter's timing.

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Sources