Caffeine Half-Life Tracker
Half-life ≈ 5 hours · All times local
Drinks
Drink
Date
Time
mg
+ Add drink
Duplicate last day to next day
Right now
Caffeine in body
—
Peak
—
Below 25 mg at
—
At bedtime (
—
)
—
Caffeine over time
Bedtime
Add a drink above to see the graph.
<
20
mg — good sleep
20
–
100
mg — fair sleep
>
100
mg — poor sleep
⚙
Now
Bedtime