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Caffeine half-life tracker · rough estimate, not medical advice
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Ranges ~4–6 hrs per person (slower with age, some meds, pregnancy). Default 5.
The level under which sleep isn't meaningfully disrupted. Default ~50mg.
This is a simplified exponential-decay model: remaining = dose × 0.5^(hours / half-life),
summed across every drink. Real caffeine metabolism varies a lot between people and over the day.
Treat every number here as a rough estimate — it's a fun gut-check, not medical advice.