How much yeast for 4 cups of flour to make bread?

1.5 teaspoons granulated yeast for a 2lb. loaf, if you are making white bread.

usually 1.5 teaspoons yeast, per 3.5c. flour.

!00% Whole Wheat and Dark Breads such as Pumpernickel use more, to force rising, so do research first on those breads before baking them.