You should be able to scale the ingredients linearly, but the cooking time increase will depend on the dimensions of the new loaf. If it's just twice the mass in the same shape, you'll want to increase cooking time by a factor of approximately the cube root of 2, adding about 25% of the original cooking time - but this is just an approximation for a guideline.
this post was submitted on 01 Aug 2023
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Sourdough baking
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Also note that a larger amount of dough ferments faster. Not relevant when it’s a small increase but when doubled, quadrupled etc.
Yes, I scale bread formulas by percent like that. It does work. I never thought about a formula for the baking time, yes "a little longer" is pretty much my approach. So far so good.
I will say though - two loaves always comes out better than one for me. Always, and I have baked sourdough with this starter for 8 or 9 years now.