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How Much Caffeine Is in Diet Dr Pepper? (2024 Detailed Breakdown!)

Diet Dr Pepper

Caffeine (serving: 12 fl oz)
41 mg
Caffeine (mg / fl oz)
Caffeine strength

Despite the many different variations of the 23 flavors in Dr Pepper, the caffeine amount stays relatively consistent. There are 44.1 milligrams of caffeine per 12-ounce can of Diet Dr Pepper, compared to a comparable 42.6 milligrams in a regular Dr Pepper. The biggest differences in the formulas come down to flavors and sweeteners, unlike Coca Cola which has varying amounts of caffeine among their various recipes. Investigating the caffeine and nutritional information in Dr Pepper can help you choose the best formula for your preferences and health needs, including making informed decisions about how much caffeine you’re consuming in a given day.

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How Much Caffeine Is in Soda?

Compared to the average 136 milligrams of caffeine in a 12-ounce cup of coffee, the caffeine in soda usually hovers between 40–60 milligrams per 12-ounce can. However, the caffeine in coffee and soda aren’t exactly comparable. Coffee is a natural source of caffeine. Unless it’s been decaffeinated, coffee always contains caffeine organically. Even if you drink decaf, you are still possibly consuming a <1% residual amount of caffeine.

Sodas, on the other hand, are not natural sources of caffeine. The stimulant must be artificially added. This can be a good thing if you need to know strictly how much caffeine is in your cup, but the caffeine in soda might not be as healthy as the real thing since it comes from an artificial source.

How Much Caffeine Is in Dr Pepper Compared to Other Soft Drinks?

Diet Dr Pepper contains a comparable amount of caffeine to any other Dr Pepper formula. Most soft drinks are fairly consistent with the caffeine levels among their regular and sugar-free formulas, but Coca-Cola is an exception. Diet Coke actually contains about 20% more caffeine than regular Coke.

Here’s a table that shows how Diet Dr Pepper compares to similar sodas:

Beverage Caffeine in Milligrams Per 12 Ounce Drink
Dr Pepper 42.6 milligrams
Diet Dr Pepper 44.1 milligrams
Dr Pepper Zero Sugar 41 milligrams
Dr Pepper Caffeine-Free 0 milligrams
Coca Cola 33.9 milligrams
Diet Coca Cola 46.3 milligrams
Pepsi 38.9 milligrams
Diet Pepsi 36.7 milligrams
Mountain Dew 54.8 milligrams
Diet Mountain Dew 55.2 milligrams

How Much Caffeine Should I Have in a Day?

According to the FDA, the average adult should consume no more than 400 milligrams of caffeine in a single day. This includes all sources of caffeine—including foods that frequently sneak in the stimulant, such as chocolate and protein shakes. Sodas generally only have a low to moderate amount of caffeine, which shouldn’t be a concern for most individuals. However, you’ll need to consider how much caffeine you’re consuming each day in combination from other sources such as coffee. Additionally, the FDA recommends much lower amounts of caffeine for some people, including adolescents and pregnant women. Caffeine isn’t encouraged at all for children under 12.

a glass of cold cola
Image Credit: Olga Miltsova, Shutterstock

Is Diet Dr Pepper a Healthy Drink?

Diet drinks sound like a healthy alternative to sugar-loaded sodas, but they might not be what the doctor ordered. Sugar-free sodas like Dr Pepper are artificially sweetened with chemicals such as aspartame and sucralose. These two ingredients have been linked to a wide range of long-term health problems, including dementia.

For someone who cannot consume sugar due to health reasons, diet drinks are the best option. However, that doesn’t mean that they’re healthy. Naturally flavored sparkling water is a better choice that doesn’t typically include sugar or artificial sweeteners. A few types of sparkling water are now caffeinated, such as AHA if you’re looking for a fizzy drink with a little extra punch.

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Even though Diet Dr Pepper doesn’t have the high sugar content that’s found in a regular soda, the caffeine content is very similar to their standard formula. All soft drinks contain artificially added caffeine, unlike coffee which is a natural source of the stimulant. Additionally, the artificial sweeteners in diet drinks have been linked to deleterious diseases, which may mean they might not be the healthiest choice.

However, diet soft drinks are the only soda options for individuals who can’t have an excessive amount of sugar in their diet. If you’re concerned about your sugar and caffeine levels, you might consider trying a naturally flavored sparkling water that doesn’t have any artificial ingredients. Otherwise, you can enjoy Diet Dr Pepper in moderation.

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Featured Image Credit: Amazon



If there's a pencil and paper on her desk, Brooke Bundy has a cup of coffee (or tea) in her hand. Brooke worked in a coffee shop for three years while she finished her Bachelor's degree in Media Studies, and studied to be a writer. She met her future husband in the coffee shop where he lingered too long over deep conversations and dark roast coffee. Now they're happily married in New Orleans, LA, where they spend their free time exploring parks and cafes with their dog Tuggles.

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