Diet Dr Pepper vs Diet Mountain Dew: which has more caffeine?

Diet Mountain Dew has more caffeine than Diet Dr Pepper: 54mg vs 41mg in the same 12 oz can. That is a 13mg gap, and since the cans match, the per-serving number is the whole story.

Diet Dr Pepper vs Diet Mountain Dew: the numbers

Sources: Diet Dr Pepper's figure is verified in our Diet Dr Pepper caffeine guide against Caffeine Informer (source); Diet Mountain Dew's figure is verified in our Diet Mountain Dew guide against Caffeine Informer (source).

Which one should you pick?

Pick Diet Dr Pepper when you want the lighter dose or a slower ramp, and Diet Mountain Dew when you actually need the bigger hit and know your tolerance. If you are stacking either with other caffeinated drinks through the day, run the math against the 400mg reference rather than guessing.

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.

Related reading

• Diet Dr Pepper: the full caffeine guide
• Diet Mountain Dew: the full caffeine guide
• The verified caffeine database
• Every drink compared: the comparisons index
• Compare any two of 120+ drinks

FAQ

Does Diet Dr Pepper or Diet Mountain Dew have more caffeine? Diet Mountain Dew: 54mg per 12 oz can versus 41mg per 12 oz can for Diet Dr Pepper.

Which is stronger per ounce? Diet Mountain Dew, at about 4.5mg per fluid ounce versus 3.4mg for Diet Dr Pepper.