Pepsiのカフェインガイド：Zero、Max、通常の選択肢

355 mlのPepsi缶には38 mgのカフェインが含まれます。

• 標準的な355 mlのPepsiには38 mgのカフェインが含まれており、Diet Cokeより少なく、エナジードリンクよりはるかに少ないです。
• Diet Pepsi（355 ml）は35 mg、Coca‑Colaの各種は通常355 mlあたり34 mg；Mountain Dewは同量で54 mgと多めです。
• カフェインは体内でおよそ5.7時間ごとに半減します — 38 mgからは約6時間で約18 mg、約12時間で約9 mgになります。
• FDAは健康な成人に対して1日あたり400 mgの上限を推奨しています；妊娠時の目安は約200 mg/日であり、AAPは思春期の若者に対する常習的なカフェイン摂取を控えるよう勧めています。

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.

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.

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.

How many cans of Pepsi push you past the 400 mg adult limit?

Five 355 ml cans of Pepsi total 5 × 38 mg = 190 mg and therefore remain below the U.S. Food and Drug Administration's 400 mg/day guideline; six cans total 6 × 38 mg = 228 mg and still remain under 400 mg but much closer to half the FDA limit (U.S. Food and Drug Administration).

Daily limit is the recommended maximum amount of caffeine to consume in a single day.

The 38 mg-per-355 ml figure for Pepsi comes from USDA FoodData Central, so when you calculate multiples you should use 38 mg per can (USDA FoodData Central). For explicit arithmetic: 400 mg (FDA limit) ÷ 38 mg per can (USDA FoodData Central) = 10.5 cans, so a theoretical straight arithmetic limit would be ten full cans before crossing 400 mg; practically, acute effects, hydration and other caffeine sources matter and make approaching that many cans inadvisable. If you want to keep a running total, use our caffeine half-life calculator to log servings and see mg left in your system in real time.

How many Pepsis equal a strong cup of coffee or cold brew?

One 355 ml Pepsi at 38 mg equals roughly 0.19 of a 240 ml cold brew that has 200 mg, so you would need about 200 mg ÷ 38 mg ≈ 5.3 cans of Pepsi to match one 240 ml cold brew (dataset lists cold brew as 200 mg and Pepsi as 38 mg).

Equivalency is a calculation expressing two beverages' caffeine on the same scale (mg) so you can compare them directly.

Using dataset values, one drip coffee (240 ml) is 96 mg, so 96 mg ÷ 38 mg = 2.53 cans of Pepsi to match a single drip coffee; one espresso single shot is 63 mg (dataset) so 63 mg ÷ 38 mg = 1.66 cans. Because cola servings are standardized, comparing directly by mg is reliable; see our side-by-side drink comparison for more pairs and exact servings.

How many Pepsis reach the 200 mg pregnancy limit?

Five 355 ml cans of Pepsi give 5 × 38 mg = 190 mg and therefore stay just below the ~200 mg/day pregnancy guidance, while six cans give 6 × 38 mg = 228 mg and exceed the suggested limit (EFSA 2015 and NHS/ACOG guidance set ~200 mg/day in pregnancy; see European Food Safety Authority).

Pregnancy limit is the recommended maximum daily caffeine intake during pregnancy intended to reduce risk to the fetus.

State the numbers plainly: 200 mg (pregnancy limit per EFSA 2015) ÷ 38 mg per 355 ml Pepsi (USDA FoodData Central) = 5.26 cans, meaning five full 355 ml cans keep you under the EFSA threshold by 10 mg, but any additional caffeine from coffee, tea, chocolate or medications can push you over — our pregnancy safety guide and the NHS advice are useful companions for added sources and substitutions like caffeine-free sodas (caffeine-free soda options).

Can mixing Pepsi with energy drinks or caffeine pills create a dangerous total?

Yes—mixing beverages adds mg linearly: for example, a 355 ml Pepsi (38 mg, USDA FoodData Central) plus a 250 ml Red Bull (80 mg, dataset) equals 38 mg + 80 mg = 118 mg total; adding a 200 mg caffeine pill yields 318 mg total, which is near but still under the FDA 400 mg/day guideline (U.S. Food and Drug Administration) while potentially producing strong stimulant effects.

Synergy in this context is additive caffeine totals from multiple sources rather than a chemical interaction that multiplies mg.

Use the dataset when summing sources: a Bang can has 300 mg (dataset), a Monster is 160 mg (dataset), and caffeine pills are listed as 200 mg (dataset); a single Bang plus one Pepsi would be 300 mg + 38 mg = 338 mg, and a Bang plus a Pepsi plus a Red Bull would be 300 + 38 + 80 = 418 mg, which exceeds the FDA 400 mg/day number (U.S. Food and Drug Administration). If you are tracking combinations, consult our caffeine overdose risks guide for warning signs and always check ingredient labels before mixing products.

What should teenagers and people with heart conditions know about Pepsi's caffeine?

The American Academy of Pediatrics discourages routine caffeine use in adolescents and many clinical recommendations ask people with arrhythmia or uncontrolled heart disease to limit stimulants; a single 355 ml Pepsi is 38 mg (USDA FoodData Central), so teenagers who drink multiple sodas plus other sources can reach adult-level exposures quickly.

Adolescent guidance is the set of recommendations targeted at people under 18 regarding safe or discouraged intake of substances like caffeine.

For concrete framing: a teen drinking three 355 ml Pepsis consumes 3 × 38 mg = 114 mg from cola alone (dataset value), and adding bottled iced tea (355 ml = 45 mg in the dataset) or a single espresso shot (63 mg) can push totals above levels that AAP views as concerning; our teen safety guide explains age-specific concerns and our dosage guide shows mg per body weight. People with known heart rhythm problems should discuss caffeine with their cardiologist and consider switching to caffeine-free options listed in our caffeine-free sodas guide.

Bottom line

A 355 ml can of Pepsi contains 38 mg of caffeine (USDA FoodData Central). The U.S. Food and Drug Administration sets an upper safe limit for most healthy adults at 400 mg/day (U.S. Food and Drug Administration), and the European Food Safety Authority and NHS advise about 200 mg/day during pregnancy (European Food Safety Authority and NHS guidance); use those numbers when summing servings across coffee, tea, sodas and supplements.

Caffeine adds linearly across sources, so arithmetic is the safest tool: 400 mg ÷ 38 mg per Pepsi = 10.5 cans to hit the FDA adult limit (USDA FoodData Central and U.S. Food and Drug Administration), and 200 mg ÷ 38 mg per Pepsi = 5.26 cans to hit the ~200 mg pregnancy threshold (European Food Safety Authority). If you combine drinks and supplements, log each item (for example, a 355 ml Pepsi = 38 mg; a 250 ml Red Bull = 80 mg; a 200 mg caffeine pill = 200 mg) and compare the sum to 400 mg (FDA) or 200 mg (pregnancy guidance); our caffeine half-life calculator and latest cup before bed tool can help you time and total intake.

If you are pregnant, under 18, sensitive to stimulants, or have heart issues, aim for conservative totals and consult your clinician — the numbers above are informational and drawn from USDA FoodData Central, the U.S. Food and Drug Administration and EFSA (USDA FoodData Central; U.S. Food and Drug Administration; European Food Safety Authority).