How much caffeine is in Pepsi (12oz can)?
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Caffeine content
38 mg
per 12 fl oz (355 ml)
About this drink
Pepsi has slightly more caffeine than regular Coke and a sweeter, less peppery flavor profile. The two are roughly interchangeable for caffeine content — both are mild sodas.
Ingredients: Carbonated water, HFCS, caramel color, phosphoric acid, caffeine, citric acid, natural flavors
When will it clear your system?
38 mg is mild. Sugar (41g) is the bigger issue for sleep than the caffeine.
Based on caffeine's 5-hour half-life, a Pepsi (12oz can) consumed at 2:00 PM drops below the sleep-safe threshold (~20 mg) by approximately 18:38 the same evening.
Where this fits in a daily limit
That's about 19% of the 200 mg pregnancy guideline and 10% 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 |
|---|---|
Pepsi (12oz can) Pepsi | 38 mg |
| Coca-Cola (12oz can) Coca-Cola | 34 mg |
| Mountain Dew (12oz can) Mountain Dew | 54 mg |
| Dr Pepper (12oz can) Dr Pepper | 41 mg |
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Learn more about SipNoteFrequently asked questions
How much caffeine is in a Pepsi (12oz can)?
A 12 fl oz (355 ml) Pepsi (12oz can) contains approximately 38 mg of caffeine. Actual values may range from 38 to 38 mg depending on preparation and source variation.
Is Pepsi (12oz can) safe during pregnancy?
The current ACOG and NHS guideline is under 200 mg of caffeine per day during pregnancy. A Pepsi (12oz can) fits comfortably within that limit. Always consult your obstetrician for personalized advice.
When should I stop drinking Pepsi (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 Pepsi (12oz can) about 5 hours before sleep. 38 mg is mild. Sugar (41g) is the bigger issue for sleep than the caffeine.
Pepsi (12oz can) vs Coca-Cola (12oz can) — which has more caffeine?
Pepsi (12oz can) contains 38 mg per serving; Coca-Cola (12oz can) contains 34 mg per 12 fl oz (355 ml). Pepsi (12oz can) is the stronger of the two.
Does Pepsi (12oz can) keep you awake?
38 mg is mild caffeine. Most people can drink Pepsi (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.