Regular Mountain Dew has 54mg of caffeine per 12 oz can, and Mtn Dew Zero Sugar has 69mg per 12 oz, which is more than the regular. Both numbers come straight from PepsiCo's own product facts. So if you switched to Zero Sugar thinking you were dialing things back, you actually bumped your caffeine up by about 28 percent.
Why Zero Sugar has more caffeine than regular
This trips people up constantly. The sugar-free version being stronger feels backwards, but it is on purpose. Diet and zero-sugar sodas lose the body and sweetness that sugar provides, so the recipe leans harder on other flavor notes, and caffeine is one of them. Mtn Dew Zero Sugar is formulated as its own drink, not just regular Dew with the sugar pulled out, and PepsiCo lists it at 69mg per 12 oz. Caffeine Informer's compiled database lists it at 68mg, so call it 68 to 69mg either way.
Interesting wrinkle: Diet Mountain Dew, the older diet formula, stays at 54mg, same as regular. Zero Sugar is the one that got the caffeine boost. So "diet Dew" and "zero Dew" are not the same drink and do not carry the same caffeine.
Mountain Dew caffeine by flavor and size
Here is where the whole lineup lands. Numbers are per the listed can size. The mg per ounce column tells you the real strength, since a 20 oz bottle just scales up from the 12 oz figure.
| Drink | Size | Caffeine | mg per oz |
|---|---|---|---|
| Mtn Dew Zero Sugar | 12 oz | 69mg | 5.75 |
| Mtn Dew (regular) | 12 oz | 54mg | 4.5 |
| Diet Mtn Dew | 12 oz | 54mg | 4.5 |
| Mtn Dew Baja Blast | 12 oz | 54mg | 4.5 |
| Mtn Dew Code Red | 12 oz | 54mg | 4.5 |
| Mtn Dew Voltage | 12 oz | 55mg | 4.6 |
| Mtn Dew Major Melon | 12 oz | 55mg | 4.6 |
| Mtn Dew Spark | 12 oz | 46mg | 3.8 |
| Mtn Dew Kickstart | 16 oz | 90mg | 5.6 |
| Mtn Dew Amp Game Fuel | 16 oz | 90mg | 5.6 |
| Mtn Dew Amp | 16 oz | 142mg | 8.9 |
Regular and Diet Mountain Dew figures come from PepsiCo product facts; the flavor and energy-line numbers come from Caffeine Informer's Mountain Dew database. Scale up for bigger containers: a 20 oz bottle of regular Dew is about 90mg, and a 16.9 oz bottle is around 76mg.
For a coffee-drinker's yardstick, a 12 oz can of regular Dew at 54mg is a little more than half a small brewed coffee, and it is noticeably higher than the same size of most colas. Coca-Cola sits around 34mg per 12 oz, so a can of Dew carries roughly 60 percent more caffeine than a Coke.
For context, the FDA cites 400mg of caffeine a day as an amount generally not associated with negative effects in healthy adults. How caffeine affects you depends on your own tolerance and health, so treat these numbers as information, not advice.
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Related caffeine breakdowns
- Coca-Cola caffeine by size and variety
- Dr Pepper caffeine: regular, Zero, and Cherry
- The full Barista Life caffeine database
FAQ
Does Mountain Dew Zero have more caffeine than regular Mountain Dew? Yes. Mtn Dew Zero Sugar has 68 to 69mg per 12 oz versus 54mg in regular Dew, so switching to Zero adds roughly 28 percent more caffeine.
How much caffeine is in a 20 oz Mountain Dew? A 20 oz bottle of regular Mountain Dew has about 90mg of caffeine, since it scales up from the 54mg per 12 oz figure.
Which Mountain Dew has the most caffeine? Among the sodas, Zero Sugar leads at 68 to 69mg per 12 oz. Across the whole brand, the Amp energy drink tops out near 142mg per 16 oz can.