Sourdough Starter Feeding Calculator
Sizes a starter feeding, so you end up with what the recipe needs and a little to keep, and less to throw away.
Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
The formula
total = needed + kept starter = total × starter parts ÷ all parts hydration = water ÷ flour
Add the amounts for the feeding, mix and leave until it has risen and is bubbly. Any starter beyond what you feed can go in the discard.
What to watch out for
Use the same flour as usual, and check a new ratio over a feed or two: temperature and flour affect how quickly a starter peaks.
Frequently Asked Questions
What does 1:2:2 mean?
One part starter, two parts flour, two parts water, by weight. To end up with 125 g, that is 25 g starter, 50 g flour and 50 g water.
What hydration is my starter?
Water divided by flour. A 1:1:1 and a 1:2:2 are both 100%; a 1:2:1 is 50%, which is stiff.