Question: how much dry yeast is equivalent to fresh yeast?
Answer: For dry active yeast you generally need to use half the quantity of fresh yeast stated in the recipe and for instant yeast you need to use 1/4 of the quantity of fresh yeast. So if the recipe has 30g (1 ounce) fresh yeast then you can use 15g (1/2 ounce) active dry yeast or 7g (1/4 ounce) instant yeast instead.