Diet Coke contains about 46 mg of caffeine per 12-ounce (355 ml) can or serving. This is a bit higher than regular Coca-Cola, which has about 34 mg of caffeine per 12 ounces. For larger servings, a 20-ounce bottle of Diet Coke contains about 70 mg of caffeine. So in summary:
- 12 oz Diet Coke = 46 mg caffeine
- 12 oz regular Coke = 34 mg caffeine
- 20 oz Diet Coke = 70 mg caffeine
Diet Coke generally has more caffeine than regular Coke in the same serving size but less caffeine compared to coffee or energy drinks.
