**Coca-Cola Coke Zero のカフェイン: 34 mg · CoffeeLog**

> Coca-Cola Coke Zeroは355 mlあたり34 mgのカフェインを含み、100 mgの睡眠閾値を下回るまでにかかる時間は次のとおりです。

Source: https://trackcaffeine.com/ja/caffeine-in/coca-cola-coke-zero/ · language: ja · updated: 2026-05-28

Coca-Cola Coke Zero

34mg

355 ml（12 fl oz）の1回分あたり

最初から 100 mg を下回っています。

1. [ホーム](https://trackcaffeine.com/ja/)

2. [飲み物のカフェイン](https://trackcaffeine.com/ja/caffeine-in/)

3. Coca-Cola Coke Zero

炭酸飲料 · Coca-Cola

# Coca-Cola Coke Zeroに含まれるカフェイン量はどれくらい？

34mg のカフェイン · 355 ml（12 fl oz）の1回分あたり

100 mlあたり

9.6 mg

コーヒー換算 ≈

0.4×

400 mgの1日推奨量に対する割合

9%

半減までの時間（17 mg）

5.7 h

100 mg未満になるまでの時間

既に下回っている

出典

製造元が公表している数値

製造元がこの容量について公表している値です。配合が変更されると予告なく変わることがあります。

- [数値の出典について](https://trackcaffeine.com/sources/)

A 355 ml (12 fl oz) can of Coca-Cola Coke Zero contains **34 mg of caffeine**, which works out to a concentration of 9.6 mg per 100 ml. That is roughly one-third of the caffeine in a standard 240 ml cup of drip coffee (96 mg), placing it at 0.4× the coffee reference. The dose is low enough that most adults will not feel a pronounced stimulant effect from a single can, but it is not zero. At 34 mg, the caffeine is comparable to what one would get from a 240 ml cup of green tea (28 mg) or a small chocolate bar, and it is about half the amount in a single espresso shot (63 mg). Because the caffeine is dissolved in a carbonated liquid, absorption begins in the mouth and stomach, with peak plasma levels typically reached 30–60 minutes after finishing the drink.

The subjective experience depends heavily on individual tolerance. Someone who rarely consumes caffeine may notice a mild lift in alertness and a slight increase in heart rate, while a habitual coffee drinker might register no perceptible change at all. The 34 mg dose is 9% of the widely cited 400 mg daily maximum for healthy adults set by the FDA and EFSA, so a single can fits easily within a moderate intake. For context, one would need to drink roughly 12 cans of Coke Zero in a day to reach that 400 mg ceiling, though the volume of liquid and the sweeteners would likely become limiting factors long before the caffeine.

*Coca-Cola Coke Zeroは34 mgで始まります。約16 mgが6時間後にもまだ循環しており、12時間後には8 mgが残っています — 減少の長い尾部のため、午後の飲み物が就寝時にも検出されることがあります。 このページへのリンクがあれば自由に再利用できます。*

*1回分を基準に、時間経過ごとにどれくらいのカフェインが残るかの概算です（集団平均の半減期は5.7時間）。*

| 時間 | 残りのカフェイン | % 残り | 睡眠閾値との比較 |
| --- | --- | --- | --- |
| 1回分の時点で | 34 mg | 100% | 下回る |
| 1 h後 | 30 mg | 88% | 下回る |
| 3 h後 | 24 mg | 71% | 下回る |
| 6 h後 | 16 mg | 47% | 下回る |
| 9 h後 | 11 mg | 32% | 下回る |
| 12 h後 | 8 mg | 24% | 下回る |

## Coca-Cola Coke Zero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 34 mg dose, the amount remaining in the body can be estimated as: 34 × 0.5(hours/5.7). After 3 hours, approximately 24 mg remain; after 6 hours, 16 mg; after 9 hours, 11 mg; and after 12 hours, about 8 mg. By the 12-hour mark, the circulating caffeine has dropped to a level lower than that found in a 240 ml cup of decaffeinated coffee (which typically contains 2–5 mg). This rapid decline means that for most people, a single can consumed in the early afternoon will be largely cleared by bedtime.

If someone drinks a Coke Zero at 15:00, the model predicts that at 23:00 — eight hours later — roughly 13 mg of caffeine would still be active. That is a small amount, equivalent to about half a cup of green tea. For the majority of adults, this residual caffeine is unlikely to interfere with sleep onset or sleep quality. However, a 2013 study by Drake et al. (Journal of Clinical Sleep Medicine) demonstrated that even 400 mg of caffeine taken six hours before bed can reduce total sleep time by more than an hour, which underscores that individual sensitivity varies widely. For a person who is a slow caffeine metaboliser — whether due to genetics, liver function, or medication use — the half-life can extend to 8–10 hours, meaning that the same 15:00 Coke Zero could still leave over 20 mg in circulation at 23:00, a dose that might be sufficient to delay sleep in sensitive individuals.

## Coca-Cola Coke Zeroは何時まで飲めますか？

*Coca-Cola Coke Zero（34 mg）の場合、23:00の就寝時に100 mg未満になるように飲める最終時刻。 このページへのリンクがあれば自由に再利用できます。*

The 34 mg in a single can of Coke Zero represents 9% of the
- [FDA](https://www.fda.gov/consumers/consumer-updates/spilling-beans-how-much-caffeine-too-much) and
- [EFSA](https://www.efsa.europa.eu/en/efsajournal/pub/4102) daily caffeine guidance of 400 mg for healthy adults. That is a small fraction, and even four cans spread across a day (136 mg) would still leave plenty of room before hitting the limit. For a pregnant woman, however, the EFSA recommends limiting daily intake to 200 mg, so one can accounts for 17% of that ceiling — still modest, but worth tallying if other sources are present. Adolescents are advised by Health Canada to consume no more than 2.5 mg per kilogram of body weight per day; for a 50 kg teenager, that equates to 125 mg, making a single Coke Zero 27% of the daily cap. In all cases, the dose is low enough that it can be incorporated into a mindful caffeine budget without much difficulty.

When it comes to sleep, timing matters more than the absolute dose. Using the 5.7-hour half-life, a 34 mg dose consumed at 18:00 would leave about 20 mg in the body at 23:00, which is enough to occupy a significant fraction of adenosine receptors in a sensitive person. To reduce the bedtime residual below 10 mg, the last Coke Zero should ideally be finished by 11:00 on the same day — a 12-hour buffer. For most people, that level of caution is unnecessary; a can at 15:00 or even 16:00 is unlikely to cause problems. The
- [latest-cup-before-bed tool](https://trackcaffeine.com/ja/tools/last-cup-before-bed/) lets one enter a usual bedtime and see a personalised cut-off time based on sensitivity level. For those who know they are slow metabolisers — a trait present in about 10–15% of the population due to CYP1A2 gene variants — an even wider margin is prudent. The
- [safe daily limit tool](https://trackcaffeine.com/ja/tools/safe-daily-limit/) can also translate the 400 mg guidance into a body-weight-adjusted number, which is especially useful for lighter individuals.

## 他と比較する

*Coca-Cola Coke Zero（34 mg）を同カテゴリの飲料および多くの人が基準にする飲み物と並べた比較図。破線は100 mgの睡眠閾値と400 mgの1日推奨量を示します。 このページへのリンクがあれば自由に再利用できます。*

*当データセットにある炭酸飲料カテゴリのすべての飲料を、1回分の量と濃度付きで表示しています。*

| ドリンク | 1回分 | カフェイン | 100 ml あたり |
| --- | --- | --- | --- |
| Coca-Cola Coke Zero | 355 ml | 34 mg | 9.6 |
| [Club-Mate](https://trackcaffeine.com/ja/caffeine-in/club-mate/) | 330 ml | 66 mg | 20 |
| [Mountain Dew](https://trackcaffeine.com/ja/caffeine-in/mountain-dew/) | 355 ml | 54 mg | 15.2 |
| [Coca-Cola Diet Coke](https://trackcaffeine.com/ja/caffeine-in/coca-cola-diet-coke/) | 355 ml | 46 mg | 13 |
| [Dr Pepper](https://trackcaffeine.com/ja/caffeine-in/dr-pepper/) | 355 ml | 42 mg | 11.8 |
| [Sunkist Orange](https://trackcaffeine.com/ja/caffeine-in/sunkist-orange/) | 355 ml | 41 mg | 11.5 |
| [Pepsi](https://trackcaffeine.com/ja/caffeine-in/pepsi/) | 355 ml | 38 mg | 10.7 |
| [Diet Pepsi](https://trackcaffeine.com/ja/caffeine-in/diet-pepsi/) | 355 ml | 35 mg | 9.9 |

At 34 mg of caffeine per 355 ml, Coke Zero sits in the lower middle of the soda category. It contains exactly the same amount of caffeine as a regular
- [Coca-Cola (34 mg)](https://trackcaffeine.com/ja/caffeine-in/coca-cola-355-ml/), which surprises many consumers who assume that sugar-free versions are also stimulant-free. In fact, the zero-sugar formulation was designed to mimic the taste and mouthfeel of the original, and caffeine is part of that flavour profile. Among major cola brands, Diet Coke is noticeably higher at 46 mg, while
- [Pepsi (38 mg)](https://trackcaffeine.com/ja/caffeine-in/pepsi/) and Diet Pepsi (35 mg) are only marginally above Coke Zero. Mountain Dew, at 54 mg, delivers nearly 60% more caffeine per can, and Club-Mate, a caffeinated mate-based soda, contains 66 mg per 330 ml — almost double the Coke Zero dose. On the lower end, Barq’s Root Beer has just 22 mg, and some root beers and lemon-lime sodas are caffeine-free entirely.

Compared to coffee, the gap is substantial. A single 240 ml cup of drip coffee (96 mg) contains almost three times the caffeine of a Coke Zero. Even a single 30 ml espresso shot (63 mg) has nearly twice the dose. This means that for someone trying to reduce their caffeine intake, replacing a morning coffee with a Coke Zero cuts the stimulant load by roughly two-thirds. However, because the caffeine in soda is often consumed more casually — as a refreshment rather than a deliberate stimulant — people can easily lose track of how many milligrams they are accumulating. Two cans of Coke Zero with lunch and one in the afternoon add up to 102 mg, which is already more than a cup of coffee. The
- [side-by-side comparison tool](https://trackcaffeine.com/ja/tools/caffeine-comparison/) allows stacking multiple drinks and seeing the cumulative total in real time.

## Coca-Cola Coke Zeroの数値を左右する要素

The caffeine content of Coca-Cola Coke Zero is consistent across the standard 355 ml can sold in the United States, but several factors can shift the number a consumer actually ingests. The most obvious variable is serving size: a 500 ml bottle (common in many markets) would contain proportionally more caffeine — roughly 48 mg, assuming the same concentration of 9.6 mg/100 ml. Conversely, a 222 ml mini can would deliver about 21 mg. The formulation itself, however, is designed to deliver a consistent caffeine dose per unit volume, and Coca-Cola’s quality control maintains tight tolerances. In 2017, the product was rebranded from “Coca-Cola Zero” to “Coca-Cola Zero Sugar,” but the caffeine content remained unchanged at 34 mg per 355 ml.

It is important to distinguish Coke Zero from genuinely caffeine-free products. The Coca-Cola company offers a
- [Caffeine-Free Coca-Cola Zero Sugar](https://trackcaffeine.com/ja/guides/caffeine-free-coca-cola-drinks/) variant in some regions, which contains no added caffeine and tests at 0 mg. That drink is labelled explicitly as “caffeine-free,” a term that in the United States means no caffeine has been added during manufacture. This differs from “decaffeinated,” a term reserved for beverages that originally contained caffeine but have had most of it removed — decaf coffee, for example, still carries a residual 2–5 mg per 240 ml cup. Coke Zero is neither caffeine-free nor decaffeinated; it is a caffeinated soda with a deliberately low dose. Consumers who are trying to avoid caffeine entirely should look for the words “caffeine-free” on the label, not just “Zero” or “Diet,” because both Coke Zero and
- [Diet Coke (46 mg)](https://trackcaffeine.com/ja/caffeine-in/coca-cola-diet-coke/) contain caffeine.

Another source of variation is the fountain dispense. When Coke Zero is served from a soda fountain, the final caffeine concentration depends on the syrup-to-carbonated-water ratio, which can drift over time if the equipment is not calibrated regularly. A fountain drink might therefore deliver anywhere from 30 to 40 mg per 355 ml serving, though the target remains 34 mg. For the most accurate count, the packaged can or bottle value is the most reliable reference point. Our dataset uses the manufacturer’s published figure for the standard 355 ml can, and we update it whenever a formulation change is announced.

## あなたのカフェイン曲線

別の飲み物を追加

あなたの半減期 · 時間 就寝時間

今体内にある量 — mg

就寝時 — mg

就寝前の最終の一杯 —

時間経過に伴う残留カフェイン量

- [CoffeeLogでワンタップで記録 →](https://trackcaffeine.com/ja/app/)

一般的な参考の推定値であり、医療アドバイスではありません。

## この数値の出典

The 34 mg figure for a 355 ml can of Coca-Cola Coke Zero is taken directly from the product label and the nutrition information published by The Coca-Cola Company on its official website. In the United States, the FDA requires that added caffeine be declared on the ingredient list, but it does not mandate a quantitative amount on the label unless the product makes a claim about caffeine content. Coca-Cola voluntarily discloses the caffeine content per serving, and independent laboratory testing by consumer groups has repeatedly confirmed that the actual caffeine levels in packaged sodas fall within a few milligrams of the stated value. Our dataset relies on these manufacturer-published numbers, cross-checked against the USDA FoodData Central database where available.

Published values can differ between countries because of local regulations, sweetener blends, and consumer preferences. For example, a 330 ml can of Coca-Cola sold in the UK contains 32 mg of caffeine, while the same volume in the US would contain approximately 31.5 mg (scaled from the 355 ml figure). These differences are small but real, and they explain why a visitor might see a slightly different number on a local can. We update the
- [open caffeine dataset](https://trackcaffeine.com/ja/dataset/) whenever a manufacturer announces a reformulation — as happened when Coca-Cola Zero was rebranded to Coca-Cola Zero Sugar in 2017 — and we note the date of the last verification. If a discrepancy is spotted between our figure and a current label, we encourage submission through our dataset contribution page, because the open dataset is maintained by the community and benefits from real-world verification.

## Coca-Cola Coke Zero についてのよくある質問

### Is Coke Zero caffeine-free?

No, Coke Zero is not caffeine-free. A 355 ml can contains 34 mg of caffeine. Only products explicitly labelled 「カフェインフリー」 contain no added caffeine. The 「Zero」 in the name refers to zero sugar, not zero stimulants.

### How much caffeine is in Coke Zero compared to Diet Coke?

Coke Zero has 34 mg per 355 ml, while Diet Coke contains 46 mg — about 35% more. Both are caffeinated, but Diet Coke delivers a slightly higher dose per can.

### Can I drink Coke Zero before bed?

For most people, a single 34 mg can in the early afternoon is unlikely to disrupt sleep. However, to minimise the bedtime caffeine residual below 10 mg, it is best to finish the drink at least 12 hours before sleep.

### Does Coke Zero have more caffeine than regular Coke?

No, Coke Zero and regular Coca-Cola both contain 34 mg per 355 ml can. The caffeine content is identical; the only difference is the sweetener used.

### Is 34 mg of caffeine a lot?

34 mg is a low dose — about one-third of a cup of coffee. It is unlikely to cause strong effects in most adults, but it can still produce mild alertness, especially in those with low tolerance.

### Why does Coke Zero have caffeine if it's zero sugar?

Caffeine contributes to the flavour profile of cola, adding a bitter note that balances sweetness. It is not removed in the zero-sugar formulation because the taste would change noticeably without it.

## 結論

Coca-Cola Coke Zero delivers **34 mg of caffeine** per 355 ml can, a concentration of 9.6 mg per 100 ml. That is 0.4 times the caffeine in a standard 240 ml drip coffee (96 mg) and 9% of the 400 mg daily limit for healthy adults. The dose is low — comparable to a cup of green tea — and for most people it will not cause noticeable stimulation or sleep disruption when consumed in the afternoon. However, it is not caffeine-free, and the amount is identical to that in regular Coca-Cola. Anyone who needs to avoid caffeine entirely should choose a product explicitly labelled “caffeine-free,” because “Zero” refers to sugar, not stimulants. For those tracking their intake, the 34 mg can be logged alongside other sources to stay within personal and medical guidelines.

CoffeeLog · iOS

## これをCoffeeLogで自動的に記録する

このサイトはその疑問に一度答えます。CoffeeLogは毎日答えます — 飲んだものを記録し、カフェインの減衰をリアルタイムで表示し、睡眠に影響が出る前の最後に飲める一杯を教えてくれます。

- [App Storeでダウンロード](https://apps.apple.com/us/app/caffeine-tracker-coffeelog/id6774424227)
- [計算機を開く](https://trackcaffeine.com/ja/tools/caffeine-calculator/)

## 関連記事

1. [Club-Mate — 66 mg 炭酸飲料](https://trackcaffeine.com/ja/caffeine-in/club-mate/)
2. [Mountain Dew — 54 mg 炭酸飲料](https://trackcaffeine.com/ja/caffeine-in/mountain-dew/)
3. [Coca-Cola Diet Coke — 46 mg 炭酸飲料](https://trackcaffeine.com/ja/caffeine-in/coca-cola-diet-coke/)
4. [Dr Pepper — 42 mg 炭酸飲料](https://trackcaffeine.com/ja/caffeine-in/dr-pepper/)
5. [Sunkist Orange — 41 mg 炭酸飲料](https://trackcaffeine.com/ja/caffeine-in/sunkist-orange/)
6. [カフェイン半減期計算機 計算ツール](https://trackcaffeine.com/ja/tools/caffeine-calculator/)
7. [就寝前の最終の一杯 計算ツール](https://trackcaffeine.com/ja/tools/last-cup-before-bed/)
8. [カフェインデータセット 公開カフェインデータセット](https://trackcaffeine.com/ja/dataset/)

TrackCaffeine はカフェインに関する一般的な参考情報を提供します。医療アドバイスではありません。カフェインの数値は公開情報に基づく推定値であり、正確な測定値ではありません。

---

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