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Caffeine half-life calculator
Caffeine's average half-life is about 5 hours (typical adult range 3–7). Enter what you drank and when — see what's still on board at bedtime.
Common reference points: a 12oz coffee ≈ 140–200mg, a shot of espresso ≈ 65mg, a 16oz energy drink ≈ 160–300mg, black tea ≈ 50mg, a 12oz cola ≈ 35mg. Check your can — energy drinks vary wildly.
Why this matters more than it feels like it does
Research consistently shows caffeine within ~6 hours of bed reduces total sleep time and sleep quality — often without you noticing the disruption. Worse sleep raises next-day fatigue, which raises next-day caffeine, which is how a stable habit quietly escalates. That loop is exactly the kind of pattern SteadyBeast is built to make visible.
See your whole stimulant picture. SteadyBeast tracks caffeine alongside nicotine, food, sleep, and mood — and its AI coach knows how they stack.Get early access
Educational information only — not medical advice, and not an endorsement of any product. Nicotine is addictive. Values reflect manufacturer label information ("label mg"), which describes nicotine content per pouch; absorbed amounts vary by person and use. Lineups change — always confirm the printed strength on your package. SteadyBeast is a coaching and self-tracking tool, not medical care. If you're in crisis, call or text 988.