How much caffeine is in Coca-Cola (12oz can)?
中文：可口可乐（355 毫升罐）
Caffeine content
34 mg
per 12 fl oz (355 ml)
About this drink
Regular Coke has 34 mg caffeine — much less than coffee or energy drinks. The sugar (39g) hits faster than the caffeine. Best treated as a sugar-and-caffeine treat rather than a stimulant source.
Ingredients: Carbonated water, HFCS, caramel color, phosphoric acid, caffeine, natural flavors
When will it clear your system?
34 mg is mild — comparable to a small cup of green tea. Sugar content may affect sleep more than caffeine.
Based on caffeine's 5-hour half-life, a Coca-Cola (12oz can) consumed at 2:00 PM drops below the sleep-safe threshold (~20 mg) by approximately 17:50 the same evening.
Where this fits in a daily limit
That's about 17% of the 200 mg pregnancy guideline and 9% of the 400 mg general adult daily limit — comfortably moderate.
See our pregnancy caffeine guide or half-life sleep math for the deep dive.
How it compares
| Drink | Caffeine |
|---|---|
Coca-Cola (12oz can) Coca-Cola | 34 mg |
| Diet Coke (12oz can) Coca-Cola | 46 mg |
| Pepsi (12oz can) Pepsi | 38 mg |
| Mountain Dew (12oz can) Mountain Dew | 54 mg |
Track your caffeine automatically
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Learn more about SipNoteFrequently asked questions
How much caffeine is in a Coca-Cola (12oz can)?
A 12 fl oz (355 ml) Coca-Cola (12oz can) contains approximately 34 mg of caffeine. Actual values may range from 34 to 34 mg depending on preparation and source variation.
Is Coca-Cola (12oz can) safe during pregnancy?
The current ACOG and NHS guideline is under 200 mg of caffeine per day during pregnancy. A Coca-Cola (12oz can) fits comfortably within that limit. Always consult your obstetrician for personalized advice.
When should I stop drinking Coca-Cola (12oz can) for sleep?
Caffeine has a 5-hour half-life. To have under 20 mg circulating at bedtime (the typical sleep-safe threshold), stop drinking Coca-Cola (12oz can) about 4 hours before sleep. 34 mg is mild — comparable to a small cup of green tea. Sugar content may affect sleep more than caffeine.
Coca-Cola (12oz can) vs Diet Coke (12oz can) — which has more caffeine?
Coca-Cola (12oz can) contains 34 mg per serving; Diet Coke (12oz can) contains 46 mg per 12 fl oz (355 ml). Diet Coke (12oz can) is the stronger of the two.
Does Coca-Cola (12oz can) keep you awake?
34 mg is mild caffeine. Most people can drink Coca-Cola (12oz can) in the afternoon without notable sleep impact.
Caffeine values shown are typical for the listed serving size. Actual content varies by preparation, brewing method, batch, and brand reformulation. Not medical advice — consult a healthcare provider for personalized guidance.