How to Convert Bread Recipe from Commercial Yeast to Levain

[SHA]

Is there some formula/rule of thumb for converting a recipe using commerical yeast to a levain in terms of adjusting the water and flour percentages ?

 

[Norcalbaker59]

Is there some formula/rule of thumb for converting a recipe using commerical yeast to a levain in terms of adjusting the water and flour percentages ?

No. A lavain is a preferment using wild yeast sourdough starter. Commercial yeast is not a leaving.

If you use a a commercial yeast preferment, you are using a sponge, poolish, or biga. They are all commercial yeast preferments.

 

[retired baker]

Is there some formula/rule of thumb for converting a recipe using commerical yeast to a levain in terms of adjusting the water and flour percentages ?

depends what type of bread, depends what type of yeast, dry vs fresh yeast is day and night.
then it depends how you like your dough.