Precision kitchen calculators

Cooking math that respects the numbers.

Pan conversions, baker’s percentages, sourdough feeding, sous-vide by thickness. Real formulas — and an honest “it depends” where it belongs.

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The sourdough feeding calculator, live. Enter your starter and ratio.

1 : :
Open the full tool, with reverse mode & discard →
Feeding Result
Add flour250g
Add water250g
Resulting starter550g
Ratio1:5:5
Peak~8–14 hours
Best forOvernight levain; milder flavour
Peak time is an estimate — watch for roughly double in size and a domed top; trust the rise, not the clock.

Kitchen calculators that respect the numbers

Real formulas where the math is real — and an honest “it depends” where it isn’t. No false-precision minute counts, no black boxes. Every tool shows its working.

Baking tools

Sourdough starterFeeding ratios, discard, peak windows Baker’s percentageBuild or reverse a formula Bread hydrationLevain-aware true hydration