Coke Zero Caffeine: Everything You Need to Know
A 355 ml can of Coke Zero contains 34 mg of caffeine.
- A 355 ml can of Coke Zero = 34 mg caffeine (9.6 mg/100 ml).
- Regular Coca‑Cola (355 ml) = 34 mg; Diet Coke (355 ml) = 46 mg
- FDA recommends healthy adults limit caffeine to 400 mg/day; pregnancy guidance is ~200 mg/day (consult your clinician).
- Average caffeine half‑life ≈ 5.7 hours; from 34 mg about 16.3 mg remains after 6 hours.
Does Coke Zero contain caffeine?
Yes. Coke Zero (commonly sold as Coke Zero Sugar) is a caffeinated cola; the standard 355 ml can contains 34 mg of caffeine according to product data and nutrition databases such as USDA FoodData Central. The caffeine level is added during formulation and reported on many labels and nutrition resources.
How much caffeine is in a can of Coke Zero?
A typical 355 ml (12 fl oz) can of Coke Zero contains 34 mg of caffeine, which equals about 9.6 mg per 100 ml. Smaller or larger bottles change the total linearly: for example a 330 ml container would be about 32 mg (dataset values show Coca‑Cola 330 ml = 32 mg), so check the serving size printed on the package in your country.
Coke Zero vs Regular Coke, Diet Coke and other drinks
Coke Zero's caffeine is similar to regular Coca‑Cola and lower than Diet Coke. Below is a compact comparison using dataset values so you can see where Coke Zero sits relative to common sodas, energy drinks and coffee.
| Drink | Serving | Caffeine (mg) | mg/100 ml |
|---|---|---|---|
| Coke Zero | 355 ml | 34 mg | 9.6 mg/100 ml |
| Regular Coca‑Cola | 355 ml | 34 mg | 9.6 mg/100 ml |
| Diet Coke | 355 ml | 46 mg | 13 mg/100 ml |
| Pepsi | 355 ml | 38 mg | 10.7 mg/100 ml |
| Mountain Dew | 355 ml | 54 mg | 15.2 mg/100 ml |
| Red Bull | 250 ml | 80 mg | 32 mg/100 ml |
| Cold brew | 240 ml | 200 mg | 83.3 mg/100 ml |
| Drip coffee | 240 ml | 96 mg | 40 mg/100 ml |
| Starbucks Pike Place (Grande) | 473 ml | 310 mg | 65.6 mg/100 ml |
How long does Coke Zero’s caffeine last in your body?
Caffeine clearance varies, but a common population‑average half‑life is about 5.7 hours. That means the amount of active caffeine roughly halves every 5.7 hours. Here are concrete numbers using the standard decay estimates (≈69% remain at 3 h, 48% at 6 h, 33% at 9 h, 23% at 12 h).
| Time after dose | % remaining | Coke Zero (34 mg) | Energy drink example (160 mg) |
|---|---|---|---|
| 0 h | 100% | 34.0 mg | 160.0 mg |
| 3 h | 69% | 23.5 mg | 110.4 mg |
| 6 h | 48% | 16.3 mg | 76.8 mg |
| 9 h | 33% | 11.2 mg | 52.8 mg |
| 12 h | 23% | 7.8 mg | 36.8 mg |
Practical takeaway: drinking a can of Coke Zero six hours before bedtime still leaves ~16 mg of caffeine in your system — enough to affect some people’s sleep.
What affects the caffeine number in cola?
Caffeine in sodas like Coke Zero is set by the manufacturer, but apparent intake depends on serving size, regional formulations and whether you drink multiple cans. Unlike brewed coffee — where brew strength, grind and extraction change caffeine dramatically — a can of Coke Zero is a fixed dose: 34 mg per 355 ml can in the dataset.
Health context and safety limits
Authoritative guidance: the U.S. Food and Drug Administration (FDA) suggests 400 mg/day as a safe upper limit for most healthy adults. For pregnancy most guidance (including advisory positions summarized by EFSA and clinicians such as Mayo Clinic) recommends limiting to around 200 mg/day. The American Academy of Pediatrics discourages caffeine‑containing sodas and energy drinks for adolescents. If you have heart disease, anxiety disorders, are pregnant, or take medications that alter caffeine metabolism, consult a clinician.
By itself, one 355 ml can of Coke Zero (34 mg) is well below daily limits, but multiple sodas, coffee and energy drinks add up quickly — track cumulative intake if you consume several sources in a day.
Practical tips and tracking
If you want a simple rule: a single can of Coke Zero is a low‑to‑moderate caffeine hit compared with coffee or energy drinks, but timing matters. Avoid caffeine within 6–8 hours of bedtime if sleep is a concern. For accurate totals across all beverages and foods, use a tracker such as CoffeeLog to log cans, coffee and energy drinks automatically and compare against recommended limits.
Label checks: always read packaging for local formulations. If you need a caffeine‑free cola, look for products explicitly labeled “caffeine‑free” — formulations and availability vary by market.
Medical caution: this page is informational only. For medical advice about caffeine intake during pregnancy, medical conditions, or interactions with medications, consult a healthcare professional.
Frequently asked questions
Does Coke Zero have caffeine?
Yes. A standard 355 ml can of Coke Zero contains 34 mg of caffeine according to product and database values.
Is Coke Zero the same caffeine as regular Coca‑Cola?
For a 355 ml serving they are effectively the same: Coca‑Cola and Coke Zero both measure about 34 mg per 355 ml in the dataset; Diet Coke is higher at 46 mg.
Will one can of Coke Zero affect my sleep?
Possibly. With a half‑life around 5.7 hours, about 16 mg (≈48%) of the 34 mg remains after 6 hours; sensitive sleepers should avoid caffeine within 6–8 hours of bedtime.
Is Coke Zero safe during pregnancy?
Guidance generally recommends limiting total caffeine to ~200 mg/day during pregnancy. One 355 ml can of Coke Zero (34 mg) is below that, but discuss total daily intake with your clinician.
Are there caffeine‑free versions of Coke Zero?
Some markets sell caffeine‑free cola products labelled “Caffeine‑Free Coca‑Cola” or similar. Standard Coke Zero contains caffeine; always read the local product label to confirm.
How can I track my daily caffeine from Coke Zero and coffee?
Use a food/beverage tracker like CoffeeLog to log each serving; the app sums caffeine across sodas, coffees and energy drinks so you can compare to recommended limits (FDA 400 mg/day).