Caffeine Half-Life Calculator
Find out how much caffeine is still in your system at bedtime.
Initial dose
95 mg
Still in system
95.0 mg
% remaining
100%
24-hour decay curve
Half-life 5h is the common average. Some people clear caffeine in 3h, others in 8–10h (smokers faster, pregnant slower).Tip: <50 mg by bedtime usually means solid sleep.
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Caffeine's half-life is roughly 5-6 hours but varies a lot by person. Enter what you drank and when, and see how much caffeine is still circulating at any hour. Helps r/Coffee and r/productivity people plan afternoon cups.
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