Mountain Dew caffeine: regular vs Zero Sugar vs every flavor

Quick answer: Mountain Dew carries 54 mg of caffeine per 12 fl oz can, according to Caffeine Informer. That is more than Coca-Cola Classic at 34 mg and more than Pepsi at 38 mg, and less than Red Bull.

The variant that catches people out is Zero Sugar, which is higher than the original at 68 mg per 12 fl oz.

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.

Mountain Dew against the cans it sits next to

All figures per 12 fl oz unless noted, from Caffeine Informer's compiled database.

Checked against Caffeine Informer, Mountain Dew, Caffeine Informer, Diet Mountain Dew, Caffeine Informer, Mountain Dew Zero Sugar, Caffeine Informer, Coca-Cola Classic, Caffeine Informer, Pepsi, Caffeine Informer, Red Bull, FDA, Spilling the Beans: How Much Caffeine is Too Much on 2026-08-17.

For context, the FDA cites 400 mg of caffeine a day as an amount not generally associated with negative effects for most adults. This page is information, not advice.

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.

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.

Related caffeine breakdowns

• Coca-Cola caffeine by size and variety
• Dr Pepper caffeine: regular, Zero, and Cherry
• The full Barista Life caffeine database

Why Zero Sugar has more caffeine than the original

Diet and zero-sugar formulations frequently carry more caffeine than the full-sugar version of the same brand, and Mountain Dew is a clear example: 68 mg against 54 mg per 12 fl oz. Sugar contributes to the flavour body of a soda, and removing it changes what the rest of the formulation has to do. Diet Mountain Dew, by contrast, sits level with the original at 54 mg, so this is a per-product decision rather than a rule about diet drinks.

How it compares to coffee

A 12 fl oz can of Mountain Dew at 54 mg is well under a cup of coffee. Caffeine Informer puts drip coffee at 178 mg per 8 fl oz and AeroPress at 187 mg per 8 fl oz. In other words, one mug of filter coffee carries roughly three cans of Dew worth of caffeine in two thirds of the volume. If you are switching from coffee to soda expecting a similar lift, the arithmetic does not support it.

Serving size is doing more work than the brand

Caffeine per can is a product of concentration and volume, and volume is the part that changes without announcement. Red Bull is the clearest case: the same drink is 80 mg in the 8.46 fl oz can and 114 mg in the 12 fl oz can, because the concentration is constant and the can got bigger. Mountain Dew sold in a 20 fl oz bottle follows the same logic. Read the serving the number is attached to before comparing two products.

Where the daily total lands

The FDA cites 400 mg of caffeine a day as an amount not generally associated with negative effects for most adults. At 54 mg a can, that is a large number of cans, and in practice nobody reaches a daily limit on Mountain Dew alone. The realistic risk is stacking: two coffees in the morning at roughly 178 mg each already sits near the figure before any soda is opened. This page is information, not advice.

Discontinued and regional variants

Caffeine Informer's database keeps entries for Mountain Dew formulations that are no longer on shelves, and their figures differ sharply from the standard can. Anything sold as a high-caffeine or energy variant of the brand should be read on its own label rather than assumed to match the 54 mg figure. Caffeine content is not always printed on soda cans in the United States, which is why a compiled database is the practical reference.

Sources

All figures checked against the linked sources on 2026-08-17.

• Caffeine Informer, Mountain Dew
• Caffeine Informer, Diet Mountain Dew
• Caffeine Informer, Mountain Dew Zero Sugar
• Caffeine Informer, Coca-Cola Classic
• Caffeine Informer, Pepsi
• Caffeine Informer, Red Bull
• FDA, Spilling the Beans: How Much Caffeine is Too Much

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.