Caffeine in Coke Zero
A 330 ml can of Coke Zero holds about 33 mg of caffeine, essentially the same as regular Coca-Cola.
| Caffeine per serving | 33 mg |
| Serving | 11.2 oz can (330 ml) |
| Caffeine per 100 ml | 10 mg |
| Share of the 400 mg daily limit | 8% |
| Equal to filter coffee | 0.3 mugs |
| Equal to espresso | 0.5 shots |
How late can you have it?
At 33 mg this sits below 40 mg, the line Cira uses as low enough to sleep on, so on its own it is unlikely to keep you awake. It still adds to whatever else is already in you.
What to know
Removing sugar does not remove caffeine. Coke Zero and Coca-Cola are within a milligram or two of each other per can.
People who switch to Zero for health reasons often increase how many cans they drink, which raises the daily caffeine total rather than lowering it.
Caffeine-free Coca-Cola exists and is genuinely at zero. It is the gold-cap can and it is the only version that will not add to your evening total.
Compared with the rest of the soft drinks
| Drink | Serving | Caffeine |
|---|---|---|
| Mountain Dew | 11.2 oz can (330 ml) | 50 mg |
| Diet Coke | 11.2 oz can (330 ml) | 42 mg |
| Dr Pepper | 11.2 oz can (330 ml) | 40 mg |
| Pepsi | 11.2 oz can (330 ml) | 36 mg |
| Coke Zero | 11.2 oz can (330 ml) | 33 mg |
| Coca-Cola | 11.2 oz can (330 ml) | 32 mg |
Common questions
How much caffeine is in Coke Zero?
Coke Zero has about 33 mg of caffeine per 11.2 oz can (330 ml). That is 8% of the 400 mg daily limit for a healthy adult, or about 0.3 mugs of filter coffee.
Will Coke Zero keep me awake?
On its own it is unlikely to. At 33 mg it stays below 40 mg, the line Cira uses as low enough to sleep on. It still adds to any caffeine already in you.
How many servings of Coke Zero can I have in a day?
About 12, going by the 400 mg daily limit for healthy adults. That limit covers everything else with caffeine in it too, so the real number is lower on a day with other coffee, tea or cola.
Read next
Compare and look up
Where these numbers come from
Caffeine content is the typical value for the serving shown, the same figure the Cira app uses. Brands and brew methods vary, so treat it as a good estimate rather than a measurement of your cup. The 5.7 hour half-life is a typical value for healthy adults, the 40 mg sleep line is a working threshold of the model, and the 400 mg daily limit is the figure used by the European Food Safety Authority and the US FDA. How the numbers are worked out.
