to convert fresh cake yeast to instant yeast, for 1 packed tablespoon/0.75 ounce fresh yeast use 2 teaspoons instant yeast or 2-1/2 teaspoons active dry
1 teaspoon instant aka instant active dry=1-1/4 teaspoons active dry or 1-1/2 teaspoons fresh cake yeast
Instant yeast is the small grain 7 g packet.
Active dry is the larger grain dried yeast, usually soaked in water.
Fresh cake yeast is fresh bakery yeast.
Hope this helps