Does Root Beer Have Caffeine? Barq's, Mug, A&W, and McDonald's Compared

Does Root Beer Have Caffeine? Barq's, Mug, A&W, and McDonald's Compared

Does root beer have caffeine? Most of it does not. Of the major brands sold in North America, only one contains caffeine by default: Barq's, which has 22 mg per 12 fl oz can. A&W, Mug, Dad's, IBC, and every other widely distributed root beer carry 0 mg. If someone told you root beer "has caffeine," they were almost certainly drinking a Barq's.

That 22 mg is still low by soda standards (Coca-Cola has 34 mg; Mountain Dew has 54 mg), but it is enough to matter if you are avoiding caffeine entirely, giving a can to a child, or drinking one before bed.

The Full Root Beer Caffeine Table

Every major root beer brand, sourced to the manufacturer where possible. All values are per 12 fl oz serving.

*McDonald's lists both a regular and a caffeine-free Barq's on its US nutrition site. More on that below.

How Barq's Compares to Colas, Coffee, Tea, and an 80 mg Pouch

Twenty-two milligrams sounds small. Here is where it actually sits relative to other caffeine sources. All per standard serving.

Barq's delivers roughly two-thirds the caffeine of a Coca-Cola and less than a quarter of a standard cup of coffee. If you are tracking against the FDA's general threshold of 400 mg per day for healthy adults, you would need 18 cans of Barq's to reach it.

Does Barq's Root Beer Have Caffeine?

Yes. A standard 12 fl oz can of Barq's Root Beer contains 22 mg of caffeine, confirmed on Coca-Cola's own brand page. Caffeine is listed explicitly in the ingredients: carbonated water, high fructose corn syrup, caramel color, sodium benzoate, citric acid, caffeine, artificial and natural flavors, acacia.

Two exceptions to know about:

• Barq's Zero Sugar Root Beer (formerly Diet Barq's) is caffeine free, per Coca-Cola.
• Barq's sold in Utah is commonly caffeine free. According to BYU's Daily Universe, Swire Coca-Cola chose to distribute a caffeine-free fountain formula in its Utah division, in part because many members of the Church of Jesus Christ of Latter-day Saints avoid caffeinated drinks.

So "does Barq's root beer have caffeine" depends on which Barq's you picked up. The regular canned and bottled product sold in most of the US: yes. The Zero Sugar version or a Utah fountain pour: no.

Why Does Barq's Have Caffeine When Other Root Beers Don't?

Caffeine is not a natural component of root beer flavoring. Traditional root beer gets its taste from sassafras (now safrole-free sassafras bark extract), wintergreen, vanilla, and anise. None of those contain meaningful caffeine.

Barq's includes caffeine as a deliberately added ingredient. Edward Barq first bottled his signature drink in Biloxi, Mississippi, around 1898. According to historical accounts, the original formula included caffeine to give the soda a sharper, less sweet profile compared to the creamier root beers of the era. That distinction became the brand's identity: "Barq's has bite."

When Coca-Cola acquired Barq's in the mid-1990s, it kept the caffeinated formula intact. The caffeine contributes a mild bitterness that, combined with higher carbonation, creates the "bite" Barq's markets. No other major root beer brand followed suit. A&W, Mug, Dad's, and IBC all stayed caffeine free.

Does Diet Barq's Have Caffeine?

No. Diet Barq's Root Beer (now sold as Barq's Zero Sugar Root Beer) is caffeine free, with 0 calories and 0 g of sugar. Coca-Cola's brand page states it plainly: "our Zero Sugar Root Beer can help you keep the calories down and is caffeine free."

This catches people off guard. With most sodas, the diet version mirrors the regular version's caffeine content (Diet Coke actually has more caffeine than regular Coke). Barq's breaks that pattern. If you want the Barq's flavor without the stimulant, the Zero Sugar can is the straightforward fix.

Does McDonald's Root Beer Have Caffeine?

McDonald's serves Barq's Root Beer at participating US locations. The McDonald's US menu lists it in multiple sizes. But it also separately lists a "Barq's Caffeine Free Root Beer" on the same site.

The explanation: Coca-Cola Freestyle fountain machines, which many McDonald's locations use, dispense a caffeine-free version of Barq's. According to Wikipedia's Barq's entry (citing Caffeine Informer and Swire Coca-Cola sources), Freestyle machines use the same concentrated base for both regular and diet Barq's, with only the sweetener differing. Since the diet formula is caffeine free, the regular Freestyle pour is too.

The practical takeaway: if your McDonald's uses a Freestyle machine, your Barq's is likely caffeine free. If the location serves from a traditional syrup-and-carbonated-water fountain system, the caffeine content may match the canned product. McDonald's own nutrition calculator is the safest place to check for your specific order.

Not all McDonald's locations carry root beer at all. Availability varies by franchise, and some locations discontinued it years ago.

Is Root Beer Caffeine Free?

As a category, yes. Healthline's review summarizes it well: most brands of root beer sold in North America are caffeine free. The exception is regular Barq's, and even Barq's has caffeine-free variants (Zero Sugar, Utah distribution, and Freestyle fountain pours).

If you are scanning a shelf and want certainty, check the ingredients list. The FDA requires that added caffeine be listed as an ingredient on food and beverage labels. If "caffeine" does not appear in the ingredients, the root beer has none.

Quick rule of thumb:

• Barq's (regular, canned/bottled, outside Utah): 22 mg caffeine
• Everything else on the shelf: 0 mg

Conclusion: Choosing the Right Caffeine Level

Root beer is one of the few soda categories where the default is zero caffeine. That makes it a reliable late-night option, a reasonable choice for kids, and a simple swap when you want a soda without the stimulant. Just confirm the label says "caffeine free" if you are picking up Barq's specifically.

On the other end of the spectrum, 22 mg is not much of a pick-me-up either. If what you actually want is sustained alertness, a single can of Barq's delivers less caffeine than a cup of green tea. The gap between root beer's caffeine range (0-22 mg) and what most adults use for focus (80-200 mg) is wide. Know what you are reaching for and why.

Frequently Asked Questions

Does all root beer have caffeine?

No. The vast majority of root beer brands sold in the US and Canada are caffeine free, including A&W, Mug, Dad's, and IBC. Regular Barq's is the primary exception, with 22 mg of caffeine per 12 fl oz can. If "caffeine" is not listed in the ingredients, the root beer has none.

Does Barq's root beer have more caffeine than Coke?

No. Barq's has 22 mg per 12 fl oz, while Coca-Cola Classic has 34 mg per 12 fl oz. Barq's contains about 35% less caffeine than a regular Coke.

Is Barq's Zero Sugar Root Beer the same as Diet Barq's?

Essentially yes. Coca-Cola rebranded Diet Barq's as Barq's Zero Sugar Root Beer. Both are caffeine free with 0 calories and 0 g of sugar.

Why is Barq's the only root beer with caffeine?

Caffeine was part of Edward Barq's original formula dating to around 1898. It was added intentionally for its bitter "bite," not derived from root beer's natural flavoring ingredients. Other brands never adopted this approach, so Barq's remains the outlier.

Does root beer have more caffeine than coffee?

No. Even Barq's, the only major caffeinated root beer, has 22 mg per 12 fl oz. A standard 8 fl oz cup of drip coffee contains roughly 95 mg, more than four times as much.

Is the Barq's at McDonald's caffeine free?

It depends on the dispensing system. McDonald's locations using Coca-Cola Freestyle machines typically serve caffeine-free Barq's. McDonald's even lists a separate "Barq's Caffeine Free Root Beer" on its nutrition site. Check the in-store signage or the McDonald's app for your location.

Can kids drink root beer?

Most root beer is caffeine free and, from a caffeine standpoint, no different from other caffeine-free sodas. Root beer is still a sugary drink (a 12 fl oz Barq's has 44 g of sugar), so the usual dietary guidance for children and added sugar applies. If the root beer is Barq's, note the 22 mg caffeine.

How many Barq's root beers equal one cup of coffee?

Roughly four to five. A cup of drip coffee has about 95 mg of caffeine. At 22 mg per can, you would need about 4.3 cans of Barq's to match it.

When 22 mg Is Not Enough and 0 mg Is Too Little

Root beer sits at the extremes: nearly every brand has zero caffeine, and the one exception delivers just 22 mg. If you actually need sustained focus, neither option does much.

Roon is a zero-nicotine oral pouch built for a different purpose: 80 mg of caffeine paired with 60 mg L-theanine, 25 mg methylliberine (Dynamine), and 5 mg theacrine (TeaCrine). The combination is designed for a 6-8 hour window of alert, smooth energy, not the 30-minute sugar spike from a can of soda.

Roon is not a soda replacement or a flavor experience. It is a zero-sugar, zero-calorie caffeine tool that fits in your pocket, starting from $9.16 per tin. If you want something to drink before bed, grab an A&W. If you need to be sharp for the next six hours, that is a different problem and a different product.

Related from Roon

• Does Coke Zero Have Caffeine? for how Coke Zero's caffeine compares
• How Much Caffeine Is in a Cup of Coffee? for coffee's caffeine, for scale
• How Much Caffeine Is in a Focus Pouch? for 80 mg, no soda required
• Does Sprite Have Caffeine? for the lemon-lime side of the soda-caffeine question

Written by Roon Team