Baking tips: The relationship between yeast quantity and fermentation time

Bakers often make the mistake of assuming that adding more yeast is necessary for bread to rise better. However, the amount of yeast required depends on the type of yeast, the recipe, the temperature of the dough and the room, and most importantly, the fermentation time.

Using more yeast simply accelerates the fermentation process. If more time is allowed for fermentation, the amount of yeast can be significantly reduced—sometimes by 50 to 80 percent. Professional baker's mathematics suggests that for 500 grams of flour, a standard formula might use six grams of yeast (1.2 percent of the flour mass), but this is not a universal rule. Tests by King Arthur Baking demonstrated that reducing yeast from 2.25 teaspoons to just half a teaspoon still produces successful bread, provided the dough is given sufficient time and the correct temperature to rise.