How much caffeine is in Effect Energy?

Effect Energy (330 ml) contains 105 mg of caffeine.

Caffeine is a central nervous system stimulant.

The can's stated concentration is 31.8 mg per 100 ml, and that concentration and the 105 mg total figure come from the open dataset we publish on TrackCaffeine (see the dataset for raw entries at /dataset/), which lists 105 mg for this 330 ml serving.

Put another way, this 105 mg dose is about 1.1× a standard 240 ml cup of drip coffee that our dataset lists as 96 mg, a comparison taken from the same dataset (/dataset/), so the can is modestly stronger than a single average cup of drip coffee.

The label's 105 mg usually gives a perceptible alertness effect within 15–45 minutes after ingestion and typically peaks within 30–120 minutes; these timing patterns are pharmacokinetic descriptions commonly summarized in public references and by clinical sources such as the Mayo Clinic, which describes onset and peak timing for oral caffeine (Mayo Clinic, 2020).

This can supplies 26% of the commonly cited healthy-adult guidance of 400 mg daily (26% of 400 mg, per the U.S. Food and Drug Administration at https://www.fda.gov/consumers/consumer-updates/spilling-beans-how-much-caffeine-too-much).

How long Effect Energy stays in your system

This page models elimination as first-order: remaining = dose × 0.5^(hours / 5.7), using a population-average half-life of 5.7 hours (the calculator implementation is documented on TrackCaffeine's half-life tool at /tools/caffeine-calculator/).

Apply that formula to the 105 mg dose and you get the listed decay numbers: remaining at 3 h = 105 × 0.5^(3/5.7) = 105 × 0.6946 = 72.9 mg ≈ 73 mg (model: half-life 5.7 h, calculator at /tools/caffeine-calculator/), at 6 h = 105 × 0.5^(6/5.7) = 105 × 0.4823 = 50.6 mg ≈ 51 mg (same model), at 9 h = 105 × 0.5^(9/5.7) = 105 × 0.3342 = 35.1 mg ≈ 35 mg (same model), and at 12 h = 105 × 0.5^(12/5.7) = 105 × 0.2326 = 24.4 mg ≈ 24 mg (same model at /tools/caffeine-calculator/).

As a practical example, if the can is consumed at 15:00 then at 23:00 (8 hours later) the model gives remaining = 105 × 0.5^(8/5.7) = 105 × 0.3777 = 39.7 mg ≈ 40 mg (modeled with the TrackCaffeine half-life tool at /tools/caffeine-calculator/), so roughly 38–40 mg of active caffeine remains in circulation late evening under the population-average assumption.

The FDA and other major authorities set a commonly cited upper guidance of 400 mg per day for healthy adults; this can delivers 26% of that guidance (26% of 400 mg, cited from the U.S. Food and Drug Administration at https://www.fda.gov/consumers/consumer-updates/spilling-beans-how-much-caffeine-too-much), so up to three to four similar cans would exceed the 400 mg threshold if consumed in a single day.

Sleep timing: experimental sleep research shows that caffeine several hours before bedtime measurably reduces total sleep time; for example, a randomized study found that 400 mg taken six hours before bedtime still reduced total sleep time by over an hour (Drake et al., 2013, https://jcsm.aasm.org/doi/10.5664/jcsm.3170), so using the half-life model above, drinking a 105 mg can 6 hours before lights-out will leave roughly 51 mg circulating and can therefore disturb sleep in sensitive individuals (model calculations as set out on our half-life tool at /tools/caffeine-calculator/).

Practical scheduling tools: if planning bedtime at 23:00 and using the half-life model, the last convenience for this can would generally be several hours earlier—use our calculator or the last-cup tool to check a specific schedule at /tools/last-cup-before-bed/; and if body-weight-based limits are needed, consult the safe-daily-limit tool at /tools/safe-daily-limit/.

Cautionary groups: pregnant people have a lower recommended limit (200 mg/day per EFSA guidance cited in our sourcing notes), adolescents and known caffeine-sensitive individuals may experience stronger effects from a single 105 mg can and should follow advice from healthcare professionals and authoritative guidance sources.

Within energy drinks in our dataset, Effect Energy at 105 mg per 330 ml sits above Red Bull 250 ml (80 mg) but below several mainstream 473 ml cans: Monster Energy (160 mg), Rockstar (160 mg) and NOS (160 mg) are clearly higher per can, and ultra-high products such as Bang and Reign list 300 mg per 473 ml can, so Effect is in the lower-to-middle tier for total per-can caffeine (dataset entries cited via their product pages at /caffeine-in/red-bull-355-ml/ and /caffeine-in/monster-energy/).

Against coffee, the 105 mg in this can is slightly stronger than our reference 240 ml cup of drip coffee at 96 mg (dataset: drip coffee = 96 mg), so drinking one can is roughly equivalent to drinking one to one-and-a-bit cups of drip coffee in terms of caffeine mass, while espresso single shots at 63 mg remain a different concentration-and-volume experience but deliver less total caffeine than this can per single shot (dataset references: drip coffee 96 mg, espresso single 63 mg).

What changes the number for Effect Energy

A single, labeled 330 ml can of Effect Energy is the dataset entry we quote, but real-world practice creates variation: manufacturing tolerances, batch differences and labelling conventions all move the true caffeine delivered per can, and the dataset value of 105 mg should be treated as the canonical reported value rather than an absolute laboratory measurement (dataset reference: /dataset/).

Size is the simplest driver: the same formulation in a 250 ml or 355 ml package would scale the total caffeine with volume, so a smaller 250 ml serving at the same concentration would carry roughly 79.5 mg (31.8 mg/100 ml × 250 ml = 79.5 mg) while a larger 355 ml can at the same concentration would carry 113 mg; labelled products sometimes use different pack sizes and the dataset reports each distinct serving separately (see our dataset at /dataset/).

Formulation changes also matter: some brands offer 'sugar-free', 'ultra', or 'high-caffeine' variants that deliberately alter caffeine per can—compare, for example, Red Bull 355 ml at 114 mg on our site at /caffeine-in/red-bull-355-ml/ and Monster Energy 473 ml at 160 mg at /caffeine-in/monster-energy/ to see how makers vary totals across variants; those internal comparison pages in our dataset show how a single brand can present multiple caffeine totals.

Finally, home-mixing or pouring from concentrate and regional labelling differences can introduce ±10–20% practical variation for many energy drinks, so treat 105 mg as the best single reported value while acknowledging batch and measurement uncertainty (dataset: /dataset/).

Where this figure comes from

The 105 mg and 31.8 mg/100 ml values are taken from the TrackCaffeine open dataset entry for Effect Energy; differences between published labels, laboratory assays and country variants explain why other sources occasionally report slightly different totals, and we will update the number here if manufacturers or authoritative lab reports change the published figure (dataset: /dataset/).

Where we quote daily limits and sleep effects we rely on public authorities and peer-reviewed work: the 400 mg healthy-adult guidance is cited from the U.S. Food and Drug Administration (FDA consumer update), and sleep-impact evidence references Drake et al., 2013 (J Clin Sleep Med); we will revise values if manufacturer labelling changes or new, verifiable analytical data become available.

Bottom line

Effect Energy, 330 ml: 105 mg total caffeine, 31.8 mg per 100 ml (dataset entry: /dataset/); that is about 1.1× a 240 ml cup of drip coffee (drip coffee = 96 mg in our dataset) and equals 26% of the 400 mg healthy-adult guidance cited by the FDA (FDA), with modeled remaining amounts of ~73 mg at 3 h, ~51 mg at 6 h, ~35 mg at 9 h and ~24 mg at 12 h using a 5.7 h half-life (modeled at /tools/caffeine-calculator/).