Estimate when caffeine will clear your system.
Real-time clinical computation active
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This assessment provides statistical probability and mathematical interpretation based on validated clinical equations. It is not a diagnostic tool.
Caffeine has a surprisingly long half-life in the human body. This tool models how caffeine levels decay over time, helping you identify exactly when your afternoon coffee will stop impacting your ability to reach deep, restorative sleep.
The pharmacokinetics of caffeine were first detailed in the 1970s, establishing the 5-to-6 hour half-life as the biological norm for non-smoking adults.
The half-life is doubled in women taking oral contraceptives and significantly reduced in smokers. Adjust your 'Amount' slider accordingly for a more personal estimate.