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Calculator · Ch. 3–4

Starter feeding

Exact seed / flour / water quantities from your feeding ratio or a target total.

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A feeding ratio states starter : flour : water. Understand feeding ratios.

Enter a feeding ratio (starter : flour : water) or a target total weight and this gives the exact seed, flour and water quantities for the feed.

The quantities are arithmetic from your inputs. They do not account for your starter's condition or your flour.

Inputs
g
Ratio (starter : flour : water)
1:2:2
g

Optional — shows how much to discard.

%

Used for the seed's flour/water split.

Flour to add
40 g
Water to add
40 g
New total
100 g
Retained starter
20 g
Resulting hydration
100.0%
Seed split
10 g flour · 10 g water

5 parts · 20 g seed → 20 g per part

Starting point — not a law

Peak window ≈ 6–8 h at 70–72°F (book Ch. 4 table) — a starting point. Confirm by observing: bubble structure, dome, rise.

Why this math · Ch. 3–4

perPart = seed / a (or target / (a+b+c)); flour = perPart × b; water = perPart × c

Track this starterLogging feeds and watching the peak window needs a free account.