Sourdough Levain Build Calculator

Calculate how much starter, flour and water you need to build the exact amount of levain for your sourdough recipe.

YOUR LEVAIN BUILD

Build exactly what you need

Enter the amount of levain in your recipe, choose a feeding ratio and kitchen temperature. The calculator includes a small buffer so you have enough to use.

Levain needed, g

Extra buffer, %

Feeding ratio — starter : flour : water Kitchen temperature

The buffer covers levain that stays on the jar and spoon. Set it to 0% if you do not need any extra.

YOUR LEVAIN

Mix these amounts

Updates as you change the inputs.

Ripe starter22 g

Ready in≈ 12–14 h

Flour to add109 g

Water to add109 g

Ripe starter22 g
Flour109 g
Water109 g
Total levain240 g
Levain hydration100%

Time is an estimate. Watch your levain: use it when it has risen well, looks airy and is close to its peak.