May I ask about making homemade fudge please?

Hello, Im trying to get things ready for my son & I to do our holiday baking this year, & for the 1sttime in many years Im goingto make fudge, but heres my question. See the back ofthe marchmellow fluff says I need 1 1/2 packages of Bakers bar choclate. But my husband likes hersheys milk cholate fudge, I got hershery baking chip, may I ask how many cups are needed of hershey baking ships are need?