How much caffeine is in Red Bull (355 ml)?

A 355 ml can of Red Bull contains 114 mg of caffeine.

Caffeine is a central nervous system stimulant that increases alertness and reduces perceived fatigue; this sentence defines caffeine as a compound with those effects (general pharmacology literature and TrackCaffeine definitions).

The can’s concentration is 32.1 mg per 100 ml and the serving size shown here is 355 ml, which together give the 114 mg figure (TrackCaffeine dataset, USDA FoodData Central referenced as the data source). Against a standard 240 ml cup of drip coffee that contains 96 mg, the 355 ml Red Bull is about 1.2× as caffeinated by total milligrams (240 ml drip coffee = 96 mg, TrackCaffeine dataset). The can’s 114 mg equals 28% of the 400 mg daily guidance for healthy adults (400 mg/day, U.S. Food and Drug Administration: https://www.fda.gov/consumers/consumer-updates/spilling-beans-how-much-caffeine-too-much).

People typically notice the stimulant effects of 100–200 mg of caffeine within 15–45 minutes and those effects peak within about 30–120 minutes (pharmacokinetic reviews and TrackCaffeine summaries); individual sensitivity varies and the perception of “alert” is dose- and tolerance-dependent (Mayo Clinic caffeine reference, TrackCaffeine dataset). If automatic logging is needed, use the built-in calculator at /tools/caffeine-calculator/ to add this 114 mg to your daily total.

How long Red Bull (355 ml) stays in your system

First-order elimination means the rate at which caffeine leaves the body is proportional to the current amount; the TrackCaffeine half-life model uses a population-average half-life of 5.7 hours for the decay calculation (TrackCaffeine half-life model, /tools/caffeine-calculator/ used as the model reference here).

Using the formula remaining = dose × 0.5^(hours / 5.7) with dose = 114 mg gives numerical estimates at common intervals: at 3 hours: remaining = 114 × 0.5^(3/5.7) ≈ 114 × 0.694 ≈ 79 mg; at 6 hours: 114 × 0.5^(6/5.7) ≈ 114 × 0.482 ≈ 55 mg; at 9 hours: 114 × 0.5^(9/5.7) ≈ 114 × 0.334 ≈ 38 mg; at 12 hours: 114 × 0.5^(12/5.7) ≈ 114 × 0.232 ≈ 26 mg (calculations follow the first-order elimination formula and the 5.7 h half-life assumption stated above).

To put those numbers into clock-time: if the can is finished at 15:00, the model predicts roughly 79 mg still present at 18:00, 55 mg at 21:00, 38 mg at 00:00, and 26 mg at 03:00 (times derived by adding 3, 6, 9, 12 hours to 15:00; TrackCaffeine model). These are population-average values rather than personal guarantees: genetics, liver function, medications, and smoking can change elimination substantially (clinical pharmacology reviews and TrackCaffeine notes).

For daily-limit context, the U.S. Food and Drug Administration states 400 mg per day as guidance for healthy adults, and 114 mg is 28% of that single-day guidance (400 mg/day, U.S. Food and Drug Administration: https://www.fda.gov/consumers/consumer-updates/spilling-beans-how-much-caffeine-too-much; percentage computed from 114 mg ÷ 400 mg = 0.285 = 28%).

For sleep timing, Drake et al. 2013 found that consuming 400 mg of caffeine six hours before bedtime reduced total sleep time by over an hour in a controlled trial (Drake et al., Journal of Clinical Sleep Medicine 2013). Scaling that experimental result proportionally is not exact, but a 114 mg dose consumed six hours before bedtime is roughly 0.285 of the experimental dose and could therefore produce a measurable sleep disturbance for sensitive individuals (Drake et al. 2013 and TrackCaffeine proportional context).

Certain populations should be more careful: pregnant people are advised to limit caffeine to 200 mg/day according to the European Food Safety Authority (EFSA Scientific Opinion 2015: https://www.efsa.europa.eu/en/efsajournal/pub/4102), and adolescents or people with known sensitivity should use lower targets (EFSA opinion and pediatric guidance summarized in TrackCaffeine materials). Use the last-cup calculator at /tools/last-cup-before-bed/ to estimate when a 114 mg serving would need to finish before a given bedtime using the 5.7 h half-life model.

Within the energy-drink category, the 355 ml Red Bull at 114 mg is modest: it sits below 355 ml products like Celsius and Prime Energy at 200 mg and well below high-caffeine brands such as Bang and Reign at 300 mg per 473 ml (exact numbers from the TrackCaffeine dataset: Celsius 355 ml = 200 mg; Bang 473 ml = 300 mg; Reign 473 ml = 300 mg). These comparisons are from the TrackCaffeine open dataset and the individual product pages linked in our collection.

Compared with common coffee references, the 355 ml Red Bull delivers more total caffeine than a single 240 ml cup of drip coffee at 96 mg (TrackCaffeine dataset), so the can is about 1.2× a standard drip cup by milligrams. It contains less caffeine than two standard drip cups (2 × 96 mg = 192 mg, TrackCaffeine dataset) and considerably less than a concentrated multi-shot espresso intake when multiple single espressos are combined (single espresso listed as 63 mg per 30 ml in our reference dataset).

If the goal is a straightforward caffeine comparison tool, try the side-by-side comparator at /tools/caffeine-comparison/ to visualize these numbers against other products in the TrackCaffeine dataset.

What changes the number for Red Bull (355 ml)

Pack size and product variant are the primary drivers of caffeine differences within the same brand; for example, our dataset lists Red Bull (250 ml) at 80 mg and Red Bull (355 ml) at 114 mg — both entries are the same formulation scaled by can size (TrackCaffeine dataset, see /caffeine-in/red-bull-250-ml/ and the open /dataset for the record).

Other energy drinks in the same category show larger variation: Monster Energy (473 ml) is 160 mg, Monster Ultra (473 ml) is 150 mg, Bang (473 ml) is 300 mg, and Celsius (355 ml) is 200 mg — those exact figures appear in the TrackCaffeine dataset (TrackCaffeine dataset entries linked where available, e.g. /caffeine-in/monster-energy/ for Monster Energy).

Batch-to-batch variation and regional formulations can change a product’s caffeine by small amounts; when manufacturers publish a range, the TrackCaffeine value represents the commonly reported or label-declared milligrams per named serving (source: manufacturer declarations aggregated in the TrackCaffeine dataset and USDA FoodData Central). Decaffeinated or low-caffeine alternatives are distinct SKUs and carry substantially lower numbers; for drinks that list a decaf or lower-caffeine variant, consult the specific product entry rather than assuming proportional scaling (TrackCaffeine dataset guidance).

Practical takeaway: the 114 mg figure is a measured, label-derived total for the 355 ml can in our dataset, but a different can size, a special edition, or a regional recipe can move that number by tens of milligrams (TrackCaffeine dataset and manufacturer labels).

Where this figure comes from

The 114 mg number for Red Bull (355 ml) in this page is taken from the TrackCaffeine open dataset, which aggregates label declarations and public nutritional records such as USDA FoodData Central; the specific milligram figure here corresponds to the dataset entry for Red Bull 355 ml (TrackCaffeine dataset, aggregated from manufacturer labels and USDA FoodData Central). When public records disagree, the TrackCaffeine entry prefers manufacturer-declared per-serving values and corroborating public databases.

Published values can disagree because companies label by average batch content, national formulations differ, and third-party lab assays have measurement error; if a manufacturer publishes a revised label or a reliable lab report appears in USDA FoodData Central or another official repository, TrackCaffeine will update the dataset and this page (update policy: TrackCaffeine dataset change protocol found at /dataset/).

Bottom line

Bottom line: this 355 ml can of Red Bull contains 114 mg of caffeine (TrackCaffeine dataset, aggregated from label data and USDA FoodData Central). That equals 32.1 mg per 100 ml, about 1.2× a 240 ml drip coffee cup at 96 mg, and represents 28% of the 400 mg/day guidance for healthy adults (400 mg/day, U.S. Food and Drug Administration).

If timing or cumulative intake is a concern, use the TrackCaffeine half-life model (5.7 h half-life) to estimate that after 6 hours approximately 55 mg remains from this dose (114 × 0.5^(6/5.7) ≈ 55 mg), and consult the linked calculators to plan intake or bedtime timing.