The amount of caffeine in Diet Coke varies depending on the size of the can or bottle. The standard 375ml can of Diet Coke contains 48.0 milligrams of caffeine. People are often surprised when they learn that a can of Coca-Cola contains much less caffeine than the same amount of coffee.

Every day, millions of people enjoy beverages with caffeine including coffee, tea and soft drinks. Because caffeine has been consumed for centuries, we know a lot about it. It’s widely studied and is known to be safe at the levels used in our beverages.