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Caffeine Calculator
Track the coffee, tea and energy drinks you had today and see how much caffeine is left now and at bedtime.
Tip from Tink: Caffeine's half-life is about 5 hours, so afternoon coffee lingers.
In your body now
109 mg
At bedtime
48 mg
Total today
158 mg
Daily limit (adults)
400 mg
Assumes a 5-hour half-life; it varies from person to person. Under 50 mg at bedtime is easier to sleep on.
This is an estimate, not medical advice.
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How to use the Caffeine Calculator
- Tap the drinks you had, or add your own.
- Set how many hours ago each one was.
- See what's left now and at bedtime.
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