Question: how to calculate percentage of chocolate bar?
Answer: If you want to make 1 kg of chocolate you just multiply the 1 kg (1000 g) times the percentage as a decimal (0.70 = 70%) and you have how much you need. The real advantage of this is that you can quickly add up the cocoa nibs and cocoa butter to get the cocoa percent of this 75 % chocolate (70% + 5%).