Keto Calculator - get on track with your low carb diet using our easy-to-use keto calculator. It does so by substituting sugar with artificial sweeteners. This means you can drink it without knocking yourself out of ketosis. Coca-Cola Zero Sugar, or Coke Zero, recreates the Classic Coke flavor without any of the sugar or carbs. More research is needed to understand this relationship, particularly in the context of a keto diet.