Does Coke Zero Have Caffeine – Exact Mg and Diet Coke Comparison

Yes, standard Coca-Cola Zero Sugar, commonly known as Coke Zero, does contain caffeine. A 12 fl oz (355 ml) can of the standard variety contains about 34 mg of caffeine. This places it in the same range as regular Coca-Cola but below many other caffeinated beverages like Diet Coke or coffee. For those looking to avoid caffeine entirely, Coca-Cola also offers a caffeine-free version called Coca-Cola Zero Sugar Zero Caffeine.

Does Coke Zero Have Caffeine? The Straight Answer

• Standard Coca-Cola Zero Sugar (Coke Zero) contains 34 mg of caffeine per 12 fl oz (355 ml) serving — roughly equivalent to a third of a cup of brewed coffee. Coca-Cola’s own FAQ confirms this figure.
• Diet Coke contains about 46 mg per 12 fl oz, making it higher in caffeine than Coke Zero by about 35%.
• A caffeine-free variant exists globally (Coca-Cola Zero Sugar Zero Caffeine) for users who want zero stimulant.
• The caffeine content of standard Coke Zero is consistent across the US, UK, and Europe, despite differing regulatory labeling.

How Much Caffeine Is in Coke Zero vs Diet Coke?

For consumers deciding between these two zero-sugar colas, the caffeine difference is often the deciding factor. According to Coca-Cola’s official data, Diet Coke contains 46 mg of caffeine per 12 oz can, while Coke Zero Sugar has 34 mg. A detailed comparison by Healthline confirms this difference and notes that the nutritional profiles are otherwise very similar.

Sweetener Differences

Coke Zero Sugar uses a blend of aspartame and acesulfame potassium (Ace-K), while Diet Coke is sweetened with aspartame alone. This difference in sweetener formulation is part of why Coke Zero is designed to taste closer to regular Coca-Cola.

Does Coke Zero Have Caffeine in the UK and Europe?

Yes, standard Coke Zero in the UK and Europe contains caffeine. For the 330 ml can size commonly sold in these markets, the caffeine content is approximately 32 mg. A UK foodservice comparison lists Diet Coke at 42 mg per 330 ml can and Coke Zero Sugar at 32 mg per 330 ml can. Analysis from coffee-focused sources also places Coke Zero’s caffeine at the low-30 mg range per 330 ml.

This slight reduction from the US 12 oz figure (34 mg) is due to the smaller can volume. The caffeine concentration remains consistent across regions.

The Caffeine-Free Variant

For those in the UK and Europe seeking zero caffeine, Coca-Cola Zero Sugar Zero Caffeine is available. Tesco lists this product as looking and tasting like Coca-Cola original, but without sugar and without caffeine. This variant is also sold directly through Coca-Cola’s UK online store.

Is There a Caffeine-Free Version of Coke Zero?

Yes. Coca-Cola produces a variant called Coca-Cola Zero Sugar Zero Caffeine. Launched in 2010, this product contains 0 mg of caffeine while maintaining the zero-sugar, zero-calorie profile of the standard version. It is widely available online and in retail, as noted on Wikipedia’s comprehensive article on Coca-Cola Zero Sugar.

Does Coke Zero have sugar or calories? No. Both the standard and caffeine-free versions contain 0g of sugar and 0 calories. The sweetener blend of aspartame and acesulfame potassium provides the sweetness without caloric content.

Timeline: Coke Zero and Caffeine

1. 2005: Coca-Cola Zero (original formula) launched as a no-sugar alternative to Classic Coke.
2. 2010: Coca-Cola Zero Sugar Zero Caffeine introduced for caffeine-avoiding consumers.
3. 2017: Coca-Cola Zero rebranded globally as “Coca-Cola Zero Sugar” to clarify the no-sugar attribute.
4. 2025: Standard Coke Zero Sugar maintains ~34 mg caffeine per 355 ml; caffeine-free variant widely available online and in retail.

What Is Certain and What Remains Unclear About Coke Zero’s Caffeine

Caffeine Comparisons and Consumer Considerations

Coke Zero’s caffeine content (34 mg per 355 ml) is in line with other standard colas but significantly lower than premium energy drinks or coffee. For context, an 8 oz cup of brewed coffee contains about 95 mg of caffeine — nearly three times the amount in a can of Coke Zero. This makes the choice between Coke Zero and Diet Coke often a matter of taste preference and desired caffeine kick, with Diet Coke offering more stimulation.

The existence of a caffeine-free variant allows complete avoidance while keeping the zero-sugar profile. Regional consistency (US, UK, Europe) in caffeine content reflects global formulation standards, contrary to some consumer assumptions.

Sources and Official Statements

“Yes, a 12 fl oz serving of Coca-Cola Zero Sugar, or Coke Zero, contains about 34 mg of caffeine.”

— Coca-Cola Official Product Page (US)

“Coca-Cola Zero Sugar is the perfect drink for people who want all the taste of Coca-Cola, without sugar, calories or caffeine.”

— Coca-Cola Official UK Store (referring to the caffeine-free variant)

“Coca-Cola Zero Sugar Zero Caffeine, 2010, Coca-Cola Zero Sugar without caffeine (formerly marketed as ‘Caffeine-Free Coca-Cola Zero Sugar’).”

— Wikipedia, Coca-Cola Zero Sugar

Summary: What You Need to Know About Coke Zero and Caffeine

Standard Coke Zero contains 34 mg of caffeine per 12 fl oz (355 ml) can. This amount is consistent across US, UK, and European markets for the standard version. For those seeking no caffeine, the Coca-Cola Zero Sugar Zero Caffeine variant is widely available. The main difference between Coke Zero and Diet Coke is caffeine level (Diet Coke has 46 mg) and sweetener blend, not nutritional value — both contain zero sugar and zero calories. Coca-Cola’s ingredient FAQ provides the definitive source for this information.

Frequently Asked Questions