How much caffeine is in a 12-ounce can of Diet Coke?

Diet Coke has 45 milligrams of caffeine in a 12 oz can. Diet coke has a higher percentage of caffeine than a can of regular Coca Cola, which only has 32 milligrams of caffeine.

Diet coke is the second top-selling soft drink, behind regular Coca Cola, and it comes in a number of different varieties including Diet Coke with Lemon and Diet Cherry Coke. Diet Coke's caffeine levels are relatively low compared to other caffeinated beverages.For example, a mug of coffee contains approximately 100 milligrams of caffeine, and mug of tea contains about 75 milligrams. Coca Cola also offers caffeine-free Diet Coke.