Red Bull (250 ml)に含まれるカフェイン量はどれくらい？

One 250 ml can of Red Bull contains 80 mg of caffeine, which is equivalent to 32 mg of caffeine per 100 ml. That is about 0.8 times the caffeine in a standard 240 ml cup of drip coffee (96 mg) and represents 20% of the FDA’s 400 mg daily guidance for healthy adults.

For most people, 80 mg of caffeine produces a noticeable lift in alertness and concentration within 15 to 45 minutes without the jitteriness that often accompanies higher doses. The experience is similar to drinking a small cup of tea or a single shot of espresso, and it is a deliberate choice for those who want a measured energy boost rather than a overwhelming surge. The 250 ml can is the classic serving size, and its caffeine content is exactly the same in the sugar-free and zero-sugar variants, as the caffeine is added independently of sweeteners.

Because the caffeine is dissolved in a carbonated liquid, absorption begins in the stomach and small intestine, and peak plasma levels are typically reached within 30 to 60 minutes. The 80 mg dose is small enough that the stimulant effect fades gently over the following hours, which makes it a popular option for an afternoon pick-me-up that is less likely to interfere with a normal bedtime than larger energy drinks or multiple cups of coffee.

Red Bull (250 ml)が体内にどれくらい残るか

Caffeine elimination follows first-order kinetics, with a population-average half-life of 5.7 hours. For a single 80 mg dose from a 250 ml can of Red Bull, the amount remaining in the body can be estimated by the formula: remaining = 80 × 0.5^(hours/5.7). Using this model, the caffeine level drops to approximately 56 mg after 3 hours, 39 mg after 6 hours, 27 mg after 9 hours, and 19 mg after 12 hours. These numbers are not exact for every individual—liver enzyme activity, genetics, and even pregnancy can alter the half-life—but they provide a reliable average for a healthy adult.

If someone drinks a 250 ml Red Bull at 15:00, the body still retains about 56 mg at 18:00, 39 mg at 21:00, 27 mg at midnight, and 19 mg at 03:00. For a person with a target bedtime of 23:00, that means roughly 36 mg of caffeine remains in circulation as they try to fall asleep—a dose that is similar to half a can of cola. While this is below the threshold that causes severe sleep disruption in most people, the 2013 study by Drake et al. published in the Journal of Clinical Sleep Medicine found that even 400 mg of caffeine consumed six hours before bed still cost participants over an hour of sleep. The 80 mg dose is far smaller, but anyone sensitive to caffeine may still notice a longer sleep onset or lighter sleep when the last can is consumed late in the afternoon. The caffeine half-life calculator can model these effects with a personalized half-life, and the latest cup before bedtime tool estimates the cutoff time for a given dose and desired bedtime.

With a content of 80 mg, a single 250 ml can of Red Bull accounts for exactly 20% of the FDA’s 400 mg daily limit for healthy adults. That means five such cans would reach the limit, assuming no other caffeine sources. However, practical daily intake is rarely that simple, because most people also consume caffeine from coffee, tea, soft drinks, or chocolate. The safe daily limit by body weight tool provides a more personalized ceiling based on body mass, which is especially relevant for adolescents and lighter adults for whom the 400 mg blanket guidance may be too high.

For a target bedtime of 23:00, the timing of the last Red Bull matters. The half-life model shows that drinking one at 15:00 leaves about 36 mg at 23:00, which is a low residue. Drinking it at 18:00 leaves roughly 56 mg at 23:00, a dose that is still smaller than a cup of tea but may be enough to delay sleep onset in sensitive individuals. The EFSA’s 2015 safety opinion notes that single doses of 200 mg or less are unlikely to cause adverse effects in healthy adults, but the same report recommends a maximum of 200 mg per day during pregnancy. Because the 80 mg dose is well below the single-dose concern threshold, a 250 ml Red Bull is a predictable choice for those who want to avoid sleep disruption. The latest cup before bedtime tool can calculate the specific cutoff time for this dose, and the caffeine half-life calculator can adjust for individual metabolism rates.

Among energy drinks in the TrackCaffeine dataset, the 250 ml can of Red Bull sits at the gentler end of the spectrum. With 80 mg of caffeine, it is less than half the caffeine of a 473 ml can of Monster Energy (160 mg), Rockstar (160 mg), or NOS (160 mg), and only a fraction of the high-caffeine products like Bang (300 mg) and Reign (300 mg). The 355 ml Celsius contains 200 mg, and Prime Energy and 5-Hour Energy both deliver 200 mg in a 355 ml can and a 57 ml shot respectively, making them 2.5 times more caffeinated than the 250 ml Red Bull. The larger 355 ml Red Bull can still holds a relatively moderate 114 mg, which is less than the Monster Ultra (150 mg) and still well below the 200 mg mark common in newer energy drinks.

Compared to traditional coffee, the 80 mg in a 250 ml Red Bull is slightly less than a standard 240 ml cup of drip coffee at 96 mg. A single shot of espresso (30 ml) packs 63 mg, so a Red Bull is only a little more than a single espresso. This means that for someone who normally drinks a large coffee, a 250 ml Red Bull is a mild alternative, while for a non-coffee drinker it provides a noticeable but manageable stimulant effect. The side-by-side drink comparison tool allows direct mg-to-mg comparisons with any other drink in the dataset, and the Energy Drink Caffeine: Comprehensive Comparison Chart gives a broader view of how the 80 mg Red Bull stacks up against dozens of other products.

Red Bull (250 ml)の数値を左右する要素

The 80 mg figure is tied to the 250 ml can, which is the original and most widely sold Red Bull serving worldwide. The same drink in a larger 355 ml can delivers 114 mg of caffeine, as shown in our Red Bull 355 ml detail page. There are also 473 ml (16 fl oz) and 591 ml (20 fl oz) cans in some markets, and those contain proportionally more caffeine, though the per-milliliter concentration remains 32 mg per 100 ml. Red Bull does not currently offer a decaffeinated version, so every can of Red Bull, regardless of sweetener choice, contains the same amount of caffeine. The sugar-free and zero-calorie editions (Red Bull Sugarfree and Red Bull Zero) use the identical caffeine content as the original, a fact confirmed by the ingredient lists on the cans.

The 80 mg value is an average based on the labeled amount. In practice, slight batch-to-batch variation exists because caffeine is added as a pure ingredient and the final concentration depends on mixing precision. Independent testing by consumer labs occasionally reports values within a few milligrams of the label, and the United States Department of Agriculture’s FoodData Central database lists standard energy drink caffeine values that align with manufacturer declarations. For this reason, the 80 mg figure is a reliable estimate, not a guaranteed exact measurement for every single can, but the variation is negligible for dietary purposes.

The following factors are the main reasons a single can’s caffeine might differ from the labeled 80 mg:

• Serving size accuracy: The can is filled to 250 ml, but a small overfill or underfill could shift the total caffeine by a few milligrams.
• Analytical method: Different laboratories use high-performance liquid chromatography (HPLC) or other methods that may yield slightly different results, but the difference is typically less than 5%.
• Ingredient sourcing: Caffeine is a commodity chemical, and its purity is high, but minor impurities do not meaningfully alter the dose.

When comparing the 250 ml can to other energy drinks, it is helpful to note that many brands have increased their caffeine content over the years. Red Bull has kept the 80 mg benchmark consistent, which is one reason it is often used as a reference point in scientific studies on caffeine and performance.

この数値の出典

The 80 mg caffeine value for a 250 ml can of Red Bull comes directly from the product’s nutrition facts panel and ingredient list, which are regulated by authorities like the FDA and the European Food Safety Authority. These labels are based on the manufacturer’s formulation, and the amount is consistent across all markets where Red Bull is sold. The USDA FoodData Central database includes energy drink entries that reflect similar labeling, and independent verification by food testing laboratories occasionally reports values within 3–5% of the label. When discrepancies appear, they are usually due to rounding, analytical variability, or a change in formulation that is not yet reflected in older databases. We continuously monitor official product pages and scientific databases to keep the number current. If Red Bull were to reformulate and change the caffeine content, or if a new, authoritative analysis emerged with a different figure, we would update the page accordingly. The 400 mg daily limit cited throughout this page is sourced from the FDA and the EFSA Scientific Opinion on the Safety of Caffeine (2015), which are the two most widely accepted safety benchmarks.

結論

A 250 ml can of Red Bull contains 80 mg of caffeine, which is equivalent to 32 mg per 100 ml and about 0.8 times a standard cup of drip coffee. This dose represents 20% of the FDA’s 400 mg daily maximum, and it is lower than the caffeine in a 355 ml Red Bull (114 mg), a Monster Energy (160 mg), or a Bang (300 mg). After drinking one can, the body eliminates half the caffeine roughly every 5.7 hours, leaving about 56 mg after 3 hours, 39 mg after 6 hours, and 19 mg after 12 hours. For a 23:00 bedtime, a can consumed at 15:00 leaves a small residue of about 36 mg, which is unlikely to disrupt sleep in most people. The figures are drawn from the product label and verified by public databases like the USDA, and the health guidance is referenced to FDA and EFSA safety limits.