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Caffeine Calculator
Caffeine half-life tracker — when will it leave your system?
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Total caffeine: 190mg
Caffeine In Your System Now
144mg
Moderate
Initial intake190mg
Below 100mg (fully alert) in2.6h
Below 10mg (functional clear) in19.2h
Fully cleared approx.05:57 AM
Based on an average caffeine half-life of 5 hours. Individual metabolism varies (1.5–9.5 hours).
Caffeine Decay Timeline
0h
190mg
2h
144mg
4h
109mg
6h
83mg
8h
63mg
10h
48mg
12h
36mg
14h
27mg
16h
21mg
18h
16mg
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