Caffeine in Diet Coke

Caffeine in Diet Coke

How Much Caffeine in Diet Coke?

Diet Coke contains 46 mg of caffeine in a 12 fl oz serving. In comparison, a Coca-Cola Classic (Coke) and Diet Pepsi have 34 mg of caffeine in 12 fl oz. Additionally, a regular Pepsi has 38 mg of caffeine in 12 fl oz.

Diet Coke Caffeine

ProductServing SizeCaffeine (mg)Caffeine(mg)/fl oz
Diet Coke7.5 fl oz28 mg3.73 mg
Diet Coke12 fl oz46 mg3.83 mg
Diet Coke16 fl oz61 mg3.81 mg
Diet Coke20 fl oz76 mg3.8 mg



Carbonated water, caramel color, aspartame, phosphoric acid, potassium benzoate, natural flavors, citric acid, caffeine.


ProductServing SizeCaloriesTotal Fat (g)Sodium (mg)Carbs (g)Sugars (g)Protein (g)
Diet Coke7.5 fl oz0025000
Diet Coke12 fl oz0040000
Diet Coke16 fl oz0055000
Diet Coke20 fl oz0070000


Diet Coke was released in 1982, which was well after the release of Diet Pepsi in 1964. Prior to the existence of Diet Coke, The Coca-Cola Company marketed Tab as their signature diet cola. Tab was introduced in May 1963. Once Diet Coke was released, it quickly overtook Tab in sales. By the beginning of 1984, Diet Coke only trailed Coke, Pepsi, and 7 Up in popularity.

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