Pepsi Caffeine Guide: Zero, Max, and Regular Options
A 355 ml can of Pepsi contains 38 mg of caffeine.
- A standard 355 ml Pepsi has 38 mg of caffeine — less than Diet Coke and much less than energy drinks.
- Diet Pepsi (355 ml) is 35 mg; Coca‑Cola variants are typically 34 mg per 355 ml; Mountain Dew is higher at 54 mg per 355 ml.
- Caffeine halves in the body roughly every 5.7 hours — from 38 mg you’d have ~18 mg after 6 hours and ~9 mg after 12 hours.
- FDA recommends a 400 mg/day limit for healthy adults; pregnancy guidance is ~200 mg/day and AAP discourages routine caffeine for adolescents.
Caffeine content in standard Pepsi
The USDA FoodData Central lists a 355 ml (12 fl oz) can of Pepsi at 38 mg of caffeine (10.7 mg/100 ml). That is the canonical value used by nutrition databases and comparisons. For context, the same serving of Diet Pepsi is 35 mg and Coca‑Cola (355 ml) is 34 mg in the dataset.
Pepsi Zero Sugar and other low‑calorie Pepsi options
Pepsi Zero Sugar (marketed as Pepsi Zero in some countries) is a no‑sugar cola variant that typically contains caffeine in the same range as regular Pepsi or slightly higher depending on market formulation. The dataset does not list a distinct Pepsi Zero Sugar caffeine number, so use the standard-pepsi baseline (38 mg per 355 ml) as a reasonable starting point and check local nutrition labeling for exact mg.
Pepsi Max: where the figures come from and 'pepsi max caffeine free'
Pepsi Max (the name varies by country) is commonly positioned as a zero‑sugar, higher‑flavor cola and in some markets it carries more caffeine than regular Pepsi. Our dataset contains no explicit Pepsi Max number, so 'pepsi max caffeine free' as a search phrase needs unpacking: a branded "caffeine‑free" Pepsi product exists separately and would contain 0 mg, but Pepsi Max itself is typically not caffeine‑free. Always read the product label or manufacturer information for exact mg in your country.
What affects caffeine in cola and similar drinks
Three factors change the caffeine number on a can or bottle: formulation (regular vs. diet vs. zero), serving size (330/355/500 ml), and regional recipes. Unlike brewed coffee—where extraction, grind and brew method move mg by tens of milligrams—cola recipes are standardized so per‑can numbers are consistent and reported on labels and in USDA FoodData Central.
Comparing Pepsi to other sodas, energy drinks and coffee
Use the table below for direct, dataset‑sourced comparisons. These are exact values from the supplied dataset.
| Drink | Serving | Caffeine (mg) |
|---|---|---|
| Pepsi | 355 ml | 38 mg |
| Diet Pepsi | 355 ml | 35 mg |
| Coca‑Cola | 355 ml | 34 mg |
| Coke Zero | 355 ml | 34 mg |
| Mountain Dew | 355 ml | 54 mg |
| Dr Pepper | 355 ml | 42 mg |
| Barq's Root Beer | 355 ml | 22 mg |
| Red Bull | 250 ml | 80 mg |
| Monster (Monster Energy) | 473 ml | 160 mg |
| Cold brew coffee | 240 ml | 200 mg |
How long Pepsi's caffeine stays in your body (decay math)
Population‑average half‑life of caffeine is about 5.7 hours (Mayo Clinic and pharmacology references commonly cite this). Rough rules of thumb: after ~3 h ≈69% remains, ~6 h ≈48% remains, ~9 h ≈33% remains, ~12 h ≈23% remains. Below are concrete examples using a 38 mg Pepsi and a 54 mg Mountain Dew.
| Time after drinking | Pepsi (38 mg) | Mountain Dew (54 mg) |
|---|---|---|
| 0 hours | 38 mg | 54 mg |
| ~3 hours (~69% left) | ~26 mg | ~37 mg |
| ~6 hours (~48% left) | ~18 mg | ~26 mg |
| ~9 hours (~33% left) | ~13 mg | ~18 mg |
| ~12 hours (~23% left) | ~9 mg | ~12 mg |
Health, safety and timing vs sleep
Authoritative limits: FDA cites 400 mg/day as a safe upper limit for healthy adults; many authorities including EFSA and pregnancy guidance suggest limiting to ~200 mg/day during pregnancy; the American Academy of Pediatrics discourages routine caffeine for adolescents. If you drink one 355 ml Pepsi (38 mg), that is ~9.5% of the 400 mg adult limit and ~19% of a 200 mg pregnancy limit.
For sleep timing, avoid stimulant intake within 6–8 hours of bedtime if you are sensitive. Because roughly half the caffeine remains after ~5.7 hours, a late afternoon cola can still measurably affect sleep latency and sleep quality for some people.
Practical tracking and next steps
If you want to know your daily total, track every serving and portion size. CoffeeLog integrates soda, coffee and energy drink values so you can log a 355 ml Pepsi as 38 mg and see your running total against limits. For pregnancy, anxiety, heart conditions or suspected caffeine sensitivity, discuss intake with a clinician — this page is informational, not medical advice.
Frequently asked questions
Is Pepsi Max caffeine free?
No — Pepsi Max is generally not caffeine‑free. The dataset doesn’t include a Pepsi Max figure; product formulations vary by country. A labeled "caffeine‑free" Pepsi product would be 0 mg, so check the can or manufacturer info.
How much caffeine is in a can of Pepsi?
A 355 ml (12 fl oz) can of Pepsi contains 38 mg of caffeine according to the dataset (10.7 mg/100 ml).
Is Pepsi Zero Sugar the same caffeine as regular Pepsi?
Pepsi Zero Sugar often contains a similar or slightly different caffeine amount than regular Pepsi; the dataset does not list a separate number, so verify the label. Many markets keep it near the 38 mg/355 ml range.
How long after drinking Pepsi will the caffeine affect me?
Caffeine halves in about 5.7 hours for the average person. From 38 mg you’ll have ~18 mg after 6 hours and ~9 mg after 12 hours, so effects can persist for many hours depending on sensitivity.
Can I drink Pepsi while pregnant?
Experts commonly advise limiting caffeine to about 200 mg/day during pregnancy. One 355 ml Pepsi (38 mg) is well below that, but total daily intake from all sources should be considered and discussed with your clinician.
How does Pepsi compare to energy drinks and coffee?
Pepsi (38 mg/355 ml) has far less caffeine than typical energy drinks (Red Bull 250 ml = 80 mg; Monster 473 ml = 160 mg) and is much lower than many coffee drinks (cold brew 240 ml = 200 mg). Track totals with CoffeeLog to avoid exceeding recommended limits.