How Much Caffeine Is in a Can of Pop? | Soda Caffeine Guide

Pop — or soda, depending on where you grew up — is one of those drinks you probably reach for without thinking much about what’s inside. Most people know coffee has caffeine, but soda caffeine can be surprisingly low or surprisingly high, and it varies more than you’d guess. A can of Mountain Dew has more than a can of Coke, and many root beers have absolutely none.

So how much caffeine is actually in a can of pop? The short answer is zero to 55 milligrams per 12 ounces, with some niche brands pushing higher. This article breaks down the exact numbers for popular colas, citrus sodas, root beers, and diet versions, so you know exactly what you’re drinking. Knowing your can’s caffeine count matters if you’re watching your intake, avoiding caffeine later in the day, or comparing it to your morning coffee.

How Much Caffeine Is in a 12-Ounce Can?

According to Mayo Clinic, these are the caffeine amounts for common 12-ounce sodas. The numbers come from their comprehensive caffeine database, covering both regular and diet varieties.

Brand	Caffeine (mg per 12 oz)	Notes
Coca-Cola	34	Classic formula
Diet Coke	46	More than regular Coke
Pepsi	38	Slightly higher than Coke
Mountain Dew	55	Highest among majors
Dr Pepper	41	Popular for its spice blend
Barq’s Root Beer	23	Exception among root beers
Coca-Cola Zero Sugar	34	Same as original
Pepsi Zero Sugar	38	Same as regular Pepsi

As you can see, the range within colas is fairly narrow — 34 to 46 mg — but Mountain Dew stands out with 55 mg. Diet versions often have the same or slightly more caffeine than their regular counterparts, so don’t assume diet means less stimulant.

Why the Numbers Matter More Than You’d Expect

You might think a few milligrams don’t matter, but caffeine adds up quickly if you drink multiple cans a day. Here’s why the count matters for different situations.

• Daily intake limits: Experts say up to 400 mg per day is generally safe for most healthy adults. A single can of Mountain Dew uses up about 14% of that limit.
• Afternoon cutoff: Caffeine can stay in your system for several hours. Knowing your can’s content helps you decide if a late-day soda interferes with sleep.
• Pregnancy and health conditions: Many women are advised to limit caffeine to 200 mg per day during pregnancy, making brand choice important. Some medical conditions also call for reduced intake.
• Kids and teens: Smaller bodies metabolize caffeine more slowly. Parents might want to choose caffeine-free options for younger children.
• Mixing with other caffeinated beverages: If you drink coffee in the morning and soda in the afternoon, the combined total can sneak up on you.

Whether you’re counting milligrams or just curious, knowing the exact number lets you make informed choices without guessing. A quick look at the label or our table above gives you the data you need.

Caffeine in Popular Colas and Citrus Sodas

Colas are the most popular soda category, and their caffeine content falls within a predictable band. Mayo Clinic’s caffeine in Coca-Cola entry lists 34 mg per 12-ounce can. Diet Coke is higher at 46 mg, which surprises many people who assume diet versions have less. Pepsi comes in at 38 mg, while Dr Pepper — technically a blend of fruit and cola flavors — contains 41 mg.

Mountain Dew is the outlier among citrus sodas at 55 mg. That’s about 60 percent more than a standard cola. Despite its bright flavor profile, it packs more caffeine than any other mainstream soda. If you’re sensitive to caffeine, that’s an important difference.

Coke Zero Sugar and Pepsi Zero Sugar both match their regular counterparts — 34 mg and 38 mg respectively — so switching to diet doesn’t change your caffeine exposure. For comparison, a 12-ounce cup of coffee can have 140 mg or more, which puts soda in a much lower range overall.

Where Root Beer and Clear Sodas Fit In

Many people assume all sodas contain caffeine, but a large portion are entirely caffeine-free. Root beer is the most common example, with almost every brand clocking in at 0 mg per can. Here’s how the main categories break down.

1. Root beer (except Barq’s). Most root beers — A&W, Mug, IBC — contain zero caffeine. Barq’s is the major exception at 23 mg per can.
2. Lemon-lime sodas. Sprite, 7UP, Sierra Mist, and Fanta Orange all have 0 mg of caffeine. These are safe bets if you’re avoiding the stimulant.
3. Cream sodas. Brands like A&W Cream Soda and Stewart’s are also caffeine-free. They offer a sweet, vanilla-like alternative without the buzz.
4. Ginger ale. Canada Dry, Schweppes, and Vernors are typically caffeine-free. Some specialty brands may add caffeine, so check the label.
5. Other clear fruit sodas. Lemonades, fruit punches, and most tropical flavors are caffeine-free. Exceptions include some energy-infused hybrids.

If you’re looking for a soda with absolutely no caffeine, your options are plenty. Just double-check labels on unique flavors or seasonal offerings, as some companies occasionally add caffeine to unexpected recipes.

How Sodas Stack Up Against Coffee and Energy Drinks

Soda’s caffeine content is modest compared to coffee and energy drinks. An 8-ounce cup of brewed coffee contains about 95 mg — roughly 2.5 to 3 times the caffeine in a 12-ounce can of soda. That means a single coffee delivers more caffeine than even the highest-caffeine soda like Mountain Dew.

Energy drinks vary widely but often contain 80 to 200 mg per serving, depending on the brand and size. A 12-ounce can of Zevia Cola (a popular stevia-sweetened option) has 45 mg, per caffeine in zevia cola data from Tasting Table. That’s close to Diet Coke but still less than half a cup of coffee.

For a quick reference, here’s how common beverages compare:

Beverage	Serving Size	Approximate Caffeine
Brewed coffee	8 oz (237 ml)	95 mg
Red Bull	8.4 oz	80 mg
Mountain Dew	12 oz	55 mg
Diet Coke	12 oz	46 mg
Coca-Cola	12 oz	34 mg

If you’re trying to stay under a daily limit, knowing these comparisons helps. One coffee plus two sodas can easily push you beyond 200 mg, especially if the coffee is larger than 8 ounces.

The Bottom Line

The caffeine in a can of pop ranges from 0 to 55 mg for standard brands, with Barq’s Root Beer and Mountain Dew at opposite ends of the spectrum. Diet and regular versions of the same brand usually contain similar amounts, so don’t assume diet means less caffeine. Always check labels for niche brands or larger sizes, which can have more.

If you’re trying to stay under a certain daily caffeine target — whether for sleep, pregnancy, or personal preference — keep a quick reference of your favorite brands handy. The numbers here are based on standard 12-ounce cans; bottles and larger sizes will have proportionally more. Your pharmacist or doctor can help you set a safe limit for your specific situation.