How Much Sodium Does a Diet Coke Have? Full Nutrition Breakdown

Eric DawsonByEric Dawson Fitness & Workouts

If you’re asking how much sodium does a Diet Coke have, a 12 fl oz can of original Diet Coke contains 40 mg of sodium. Diet Coke Caffeine Free also has 40 mg of sodium per 12 fl oz can.

Package size matters. A 20 fl oz Diet Coke bottle is listed with 72 mg of sodium, while the standard 12 fl oz can has 0 calories, 0 g of sugar, and 46 mg of caffeine.

How Much Sodium Does a Diet Coke Have?

That Diet Coke sodium per can figure comes from Coca-Cola’s nutrition panel and applies to one 12-fluid-ounce can. Caffeine Free Diet Coke has 2% Daily Value in a 12-fluid-ounce can.

Those numbers make serving size the key detail when reading Diet Coke nutrition facts. Rather than treating 40 milligrams as a universal product number, match the nutrition panel to the container being consumed. Check the serving size before using a sodium total for a bottle or larger package.

Original Diet Coke is sold in 7.5-fluid-ounce, 8-fluid-ounce, 12-fluid-ounce, 13.2-fluid-ounce, 16.9-fluid-ounce, 20-fluid-ounce, 1.25-liter, and 2-liter packages.

Although that bottle listing is useful for the specific package described, it should not replace the manufacturer’s 12-fluid-ounce can nutrition panel when the question is about a standard can. Shoppers comparing products should use the figure printed for the package and serving size in hand. Reading the label also avoids confusing a per-serving amount with the sodium total in an entire bottle.

Percent Daily Value gives additional context for the can’s 40 milligrams of sodium. The original Diet Coke can panel also lists 0 grams of total fat, 0 grams of total carbohydrate, and 0 grams of protein. Neither the zero-calorie label nor the absence of sugar changes the listed sodium amount. Therefore, a standard can has a small but clearly identified amount of sodium rather than none at all.

Conflicting nutrition listings can make the answer seem less straightforward than the package label indicates. One SnapCalorie page gives both 40 milligrams and 26.7 milligrams of sodium for a 12-ounce serving, creating an internal mismatch. Coca-Cola’s 40-milligram figure is the better reference for an original Diet Coke 12-fluid-ounce can because it is the manufacturer’s product-specific nutrition information. SnapCalorie also has a separate listing that describes a 12-ounce serving as having approximately 40 milligrams of sodium, while its 1-cup, 240-gram nutrition listing gives 19.2 milligrams.

Diet Coke contains sodium, but its nutrition panel does not characterize the drink as an electrolyte beverage. Its listed ingredients include carbonated water, caramel color, aspartame, phosphoric acid, potassium benzoate, natural flavors, citric acid, and caffeine. Still, the sodium amount alone does not make a drink an electrolyte product. Anyone checking Diet Coke daily sodium intake can use the relevant package label for other sizes.

Diet Coke Nutrition Facts for a 12-Ounce Can

Beyond its sugar-free profile, further nutrition details for an original can appear earlier on the page. Coca-Cola’s nutrition panel also lists 46 milligrams of caffeine per can.

Calories are addressed in the nutrition details provided earlier for that serving. Sugar details, including their categories, are provided earlier. Protein is also listed at 0 grams, so Diet Coke is not a meaningful source of macronutrients despite its distinct flavor and caffeine content.

What the Can’s Nutrition Panel Shows

Original Diet Coke’s nutrition facts are straightforward and appear earlier on the page. Sodium is the mineral listed at 40 milligrams, while caffeine is listed separately at 46 milligrams, and Caffeine Free Diet Coke’s ingredient list does not include caffeine.

Diet Coke nutrition facts can be useful for readers who track calories, sugars, caffeine, or Diet Coke daily sodium as part of a broader eating pattern. Neither the 0-calorie label nor the sodium amount changes the fact that caffeine is a separate component with its own milligram measurement. Unlike a drink with carbohydrates or protein, a standard can provides none of either nutrient.

How to Check Your Can

  1. Check the serving size beside the Nutrition Facts label before comparing products.
  2. Compare sodium, caffeine, sugars, and calories on the same package basis.
  3. Use the ingredient list or SmartLabel QR code to identify the sweetener used in the product.

The ingredients in original Diet Coke are listed earlier on the page. Aspartame is the listed sweetener in original Diet Coke, although Coca-Cola notes that some versions of Diet Coke are sweetened with SPLENDA®. People with phenylketonuria, or PKU, should limit phenylalanine intake; products containing aspartame indicate the presence of phenylalanine.

Coca-Cola lists 34 milligrams of caffeine for a regular 12-ounce Coke and 46 milligrams for a 12-ounce Diet Coke. Coffee is listed at 140 milligrams or more per 12-ounce cup, placing Diet Coke’s caffeine content below that reference point. Coke Zero Sugar differs from Diet Coke in sweetener formulation, using both aspartame and acesulfame potassium, while Diet Coke’s original ingredient list includes aspartame but not acesulfame potassium.

How Sodium Changes by Diet Coke Package Size

Instead of treating one can’s listing as a universal Diet Coke sodium figure, match the serving size and package basis shown on that product.

Coca-Cola offers original Diet Coke in 7.5-fluid-ounce, 8-fluid-ounce, 12-fluid-ounce, 13.2-fluid-ounce, 16.9-fluid-ounce, 20-fluid-ounce, 1.25-liter, and 2-liter packages. That range matters because the familiar 12-fluid-ounce can nutrition panel applies to one can, not automatically to every other format. A larger bottle therefore may have a different sodium total than the can-based amount readers often use as a reference.

Serving Size Sets the Number

Nutrition facts are tied to the serving size printed on a particular package, and a 2-liter Diet Coke product listing bases its sodium information on a 360 g serving, approximately 12 fluid ounces or 360 mL, rather than the entire 2-liter bottle.

Its serving basis is close to a standard can, which explains why its sodium figure aligns with the can value even though the package itself is much larger. Caffeine figures can also vary by package listing: the 20-fluid-ounce bottle entry gives 78 mg, while the 2-liter product entry gives 47 mg per 360 g serving.

Use the full-package figure when the label identifies the whole bottle as one serving, and use the per-serving figure when the package contains multiple servings, checking the number of servings before comparing products or adding a drink to your daily sodium intake. SmartLabel QR codes and package nutrition panels are places Coca-Cola directs consumers for product nutrition information.

Compare Like with Like

Comparing sodium works best when the drinks have the same serving basis. For a can-versus-bottle comparison, a 12-fluid-ounce can and a full 20-fluid-ounce bottle are not like-for-like amounts, even when both are Diet Coke. These distinctions also apply when comparing Diet Coke versus Coke Zero Sugar, since a meaningful sodium comparison requires nutrition information for matching package sizes and servings. Reading the label for the exact product in hand keeps the comparison tied to what you are actually drinking.

Does Diet Coke Have Electrolytes?

The can panel identifies sodium as part of its nutrition information. Coca-Cola identifies the nutrient on the label, yet provides no electrolyte claim for original Diet Coke.

On its own, a sodium listing does not establish that a drink is intended, marketed, or formulated as a source of electrolytes. That distinction matters when reading the label: the official panel also lists 0 grams of total carbohydrate, sugars, and protein per 12-fluid-ounce can.

Unlike an electrolyte claim, the manufacturer’s information supplies nutrient values and standard product details. Instead, the label gives shoppers a defined sodium amount alongside the rest of the product’s nutrition information. The supplied nutrition information does not place Diet Coke in an electrolyte category.

Its ingredient list provides standard product details for original Diet Coke. For original Diet Coke, Coca-Cola lists 46 milligrams of caffeine in a 12-ounce can. Caffeine Free Diet Coke’s ingredients omit caffeine. Some versions use a different sweetener.

For consumers wondering about potassium, the available nutrition listings do not offer a consistent answer. Coca-Cola’s official original Diet Coke panel supplied here lists sodium but no potassium figure.

By contrast, SnapCalorie reports 0 milligrams of potassium for a 12-ounce serving on one page, while another listing gives 19.2 milligrams each of potassium and sodium for a 1-cup, 240-gram serving. A conflicting set of third-party listings should not override the manufacturer’s product-specific label. That inconsistency makes potassium an unsuitable basis for interpreting the drink’s role.

Consumers can treat the listed sodium as one part of the product’s nutrition profile, not as an electrolyte designation. Label information also separates Diet Coke from closely related drinks in some ways: Diet Coke and Coca-Cola Zero Sugar are both sugar free and calorie free, but Coca-Cola describes Zero Sugar as tasting more like Coca-Cola Original Taste while Diet Coke has a distinct lighter taste.

The two drinks also differ in their sweetener formulations. Aspartame labeling also raises a separate consideration for people with PKU.

Diet Coke Versus Coke Zero Sugar

For a 12-ounce serving, a comparison lists 40 mg of sodium for each drink, so the available like-for-like figure does not separate them on sodium.

Coca-Cola describes Coca-Cola Zero Sugar as looking and tasting more like Coca-Cola Original Taste. Diet Coke, by contrast, has a distinct lighter taste. That makes flavor, along with ingredient preferences and caffeine, a more useful basis for choosing between them.

Healthline characterizes Coke Zero as having less caffeine than Diet Coke, with its comparison giving 34 mg versus 46 mg per 12-ounce serving. Coca-Cola also lists Diet Coke Caffeine Free, while Healthline describes Coke Zero as available in a caffeine-free version. Packaging and SmartLabel QR codes can help shoppers review nutrition facts and ingredients for the specific product they are buying.

Comparison Diet Coke Coca-Cola Zero Sugar
Calories Calorie free Calorie free
Sugar Sugar free Sugar free
Sodium in a 12-ounce comparison 40 mg 40 mg
Sweetener description Aspartame Aspartame plus acesulfame potassium
Caffeine 46 mg per 12-ounce can Described as lower than Diet Coke
Flavor positioning Distinct lighter taste Closer to Coca-Cola Original Taste

Sweetener formulation is a clear difference in Diet Coke versus Coke Zero. Original Diet Coke has a different formulation. Coca-Cola says Coca-Cola Zero Sugar uses a blend of aspartame and Ace-K. Some Diet Coke versions are sweetened with SPLENDA®.

Flavor preferences remain personal, but Coca-Cola’s positioning explains why the drinks can appeal to different people despite sharing sugar-free and calorie-free status. Instead of aiming to duplicate Coca-Cola Original Taste, Diet Coke maintains its own lighter flavor profile. Healthline similarly says the drinks are broadly alike nutritionally while differing mainly in flavor, sweetener blend, and caffeine. Because the sodium comparison is the same at 12 ounces, those distinctions carry more weight when comparing Diet Coke with Coca-Cola Zero Sugar.

Product history also separates the brands. Diet Coke launched in 1982, while Coca-Cola Zero launched in 2005 and became Coca-Cola Zero Sugar in 2016. Coca-Cola identifies Diet Coke among its sugar-free drinks, alongside Coca-Cola Zero Sugar.

For shoppers comparing labels, Diet Coke’s 46 mg of caffeine per 12-ounce can and its aspartame-based ingredient list provide the clearest specifics. Ingredient preferences, desired flavor, and caffeine considerations can therefore help guide the choice between the two drinks.

Ingredients, Sweeteners, and Caffeine in Diet Coke

Diet Coke’s listed ingredients are the ones described earlier for the standard product on this page. Its sweetener in the standard formula is aspartame, and a 12-fluid-ounce can contains 46 milligrams of caffeine.

What Sweetens Diet Coke?

Sweetener information for Diet Coke varies by version, as described earlier in this guide. Ingredient lists can vary by product, so checking package information can help identify the formulation for a particular product. Diet Cherry Coke has a sweetener formulation that differs from the standard Diet Coke formulation noted earlier.

People with PKU can refer to the earlier phenylalanine guidance when making choices about suitable products. Products containing aspartame indicate the presence of phenylalanine, making the package label especially useful for shoppers managing that dietary requirement. Packaging also provides the most direct way to confirm the ingredients for the specific Diet Coke product being purchased.

Caffeine and Caffeine-Free Diet Coke

For comparison within Coca-Cola’s own ingredient information, a 12-ounce regular Coke has 34 milligrams of caffeine, while a 12-ounce cup of coffee has 140 milligrams or more. Caffeine amounts can differ when the serving size or package changes, so the can or bottle label remains the best reference for that package.

Diet Coke Caffeine Free follows the related ingredient information described earlier, without caffeine in its listed ingredients. Notably, caffeine does not appear in its listed ingredients. That version has the same listed nutrition profile described earlier for the standard product in a 12-fluid-ounce can.

Consumers choosing between the regular and caffeine-free versions can use the ingredient list to identify the difference directly. Checking the label also helps confirm the sweetener and caffeine information for a specific package, particularly when buying a flavor or a different product format.

Frequently Asked Questions

How Much Sodium Is in a 12-Ounce Can of Diet Coke?

A 12-fluid-ounce can of original Diet Coke has 40 mg of sodium, equal to 2% Daily Value. For the remaining nutrition information for this serving, see the nutrition details already given earlier on this page.

How Much Sodium Is in a 20-Ounce Bottle of Diet Coke?

Beyond that, a 20-fluid-ounce Diet Coke bottle is listed with 72 mg of sodium, or 3% Daily Value, for the full 600 g serving. For the remaining nutrition information for this bottle, see the nutrition details already given earlier on this page.

How Does Diet Coke Compare with Regular Coke in Caffeine?

A 12-ounce Diet Coke has 46 milligrams of caffeine, compared with 34 milligrams in a 12-ounce regular Coke. Coffee provides 140 milligrams or more in a 12-ounce cup, so Diet Coke’s caffeine content is below that reference point.

Does Diet Coke Caffeine Free Have Sodium?

For Caffeine Free, see the sodium information already given earlier for a standard can serving. Beyond that, for the remaining nutrition information for this serving, see the nutrition details already given earlier on this page.

Is Diet Coke or Coke Zero Sugar Higher in Sodium?

No direct official sodium comparison is provided here for Diet Coke and Coca-Cola Zero Sugar. Both drinks are described as sugar free and calorie free, while Diet Coke’s official 12-fluid-ounce can nutrition panel lists 40 mg of sodium.

What Sweetener Does Diet Coke Use?

Original Diet Coke is sweetened with aspartame. Coca-Cola also notes that some Diet Coke versions are sweetened with SPLENDA®, so checking the ingredient list beside the Nutrition Facts label or the SmartLabel QR code can identify the sweetener in a specific product.

The sodium information for the standard can and the listed bottle is given earlier on this page. Package size matters because sodium totals can differ by serving. Diet Coke Caffeine Free also has 40 mg per 12-fluid-ounce can. Original Diet Coke is calorie free and sugar free, with aspartame listed among its ingredients and 46 mg of caffeine in the regular 12-fluid-ounce can.

References

Sources read in September 2026.

Eric Dawson

I'm Eric Dawson, and I write The Money Watch from north Columbus, Ohio. Most of what I cover comes from my own life: renting, a 2014 Honda Fit, parking, computers, food and the bills behind all of it. I spent four years in an apartment-property office and eleven on a distributor's operations desk, reading leases and invoices. Where you need real information, I research the maker's or agency's own page and independent sources and report what they publish. I don't give tax, investment, legal or medical advice.