How to Use the Caffeine Intake & Half-Life Decay Tracker
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1
Log caffeinated drinks consumed throughout the day (e.g. Espresso 65mg, Brewed Coffee 140mg, Energy Drink 160mg, Green Tea 35mg).
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2
Enter the time of day each drink was consumed.
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3
Set your planned bedtime (e.g. 10:30 PM).
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4
The calculator plots your real-time caffeine blood level curve and estimates residual caffeine at bedtime.
Practical Example & Use Case
Common Real-World Scenario
Discovering that a 200 mg energy drink at 3:00 PM still leaves ~85 mg of active caffeine circulating in your bloodstream at 11:00 PM bedtime.
Technical Notes & Limitations
Browser Engine Architecture
Uses standard adult average 5.7-hour half-life; individual genetic clearance rates (CYP1A2 enzyme) vary.
Frequently Asked Questions
What is the recommended daily caffeine limit?
Health agencies including the FDA and EFSA recommend up to 400 mg per day for healthy adults.