How much caffeine is in Diet Mountain Dew?

As an Amazon Associate, Barista Life earns from qualifying purchases.

Diet Mountain Dew has 54mg of caffeine per 12 oz can, per Caffeine Informer. That works out to about 4.5mg per fluid ounce, well under brewed coffee at 11.9mg per ounce. Against the two standards everyone actually knows, one 12 oz can equals about 0.6 cups of brewed coffee or 0.9 shots of espresso.

Diet Mountain Dew vs coffee and espresso

How the number behaves

Sodas list an exact caffeine number because caffeine is a measured additive: every 12 oz can of Diet Mountain Dew carries the same 54mg, unlike brewed coffee, where the beans, dose, and brew time move the figure around. That predictability is the one real advantage a can has over a cup: you always know exactly what you drank.

The mistake people make is treating it as caffeine-free because it is "just a soda." At 54mg per 12 oz can, it takes about 7 servings to reach the 400mg FDA reference, but every serving still counts toward the same daily total as your coffee does.

Where to find it

Check Diet Mountain Dew prices on Amazon

Compare it

• Diet Mountain Dew vs brewed coffee: the caffeine numbers
• Diet Mountain Dew vs Celsius: the caffeine numbers
• Diet Mountain Dew vs Monster: the caffeine numbers
• The verified caffeine database

For context, the FDA cites 400mg of caffeine a day as an amount generally not associated with negative effects in healthy adults. Tolerance and health vary, so treat these numbers as information, not advice.

FAQ

How much caffeine is in Diet Mountain Dew? 54mg per 12 oz can, per Caffeine Informer. That is about 4.5mg per fluid ounce.

Is Diet Mountain Dew stronger than coffee? No. Diet Mountain Dew carries 54mg per 12 oz can versus 95mg in an 8 oz cup of brewed coffee, and per ounce it is 4.5mg versus 11.9mg.

How many servings of Diet Mountain Dew reach 400mg of caffeine? About 7.4 of the 12 oz can servings reach the 400mg daily amount the FDA cites for healthy adults.

Sources: the Diet Mountain Dew figure (54mg per 12 oz can) is Caffeine Informer (source). Brewed coffee (95mg per 8 oz) and espresso (63mg per 1 oz) reference values are from USDA FoodData Central (source).