Caffeine Half-Life Calculator
Track how long caffeine stays in your system. Know when it's safe to sleep without affecting your rest!
Caffeine Consumed
95mg
Moderate
Safe to Sleep
01:05 PM
48mg
After 5.5h (half-life)
21mg
After 12 hours
Caffeine Breakdown Timeline
08:00 AM
95mg
09:00 AM
84mg
10:00 AM
74mg
11:00 AM
65mg
12:00 PM
57mg
01:00 PM
51mg
02:00 PM
45mg
04:00 PM
35mg
06:00 PM
27mg
08:00 PM
21mg
💡 Caffeine Tips
- • Stop caffeine 6+ hours before bed
- • Stay under 400mg/day (recommended)
- • Caffeine peaks 30-60 min after consumption
Features
- Track caffeine over time
- Know when to stop for good sleep
- Multiple drink sources
- Visual breakdown timeline
- Custom caffeine amounts
How to Use
- 1Select a caffeine source or enter custom mg
- 2Set the time you consumed it
- 3See how caffeine decreases over time
- 4Check when caffeine will be low enough for sleep
Frequently Asked Questions
What is caffeine half-life?
The time it takes for half the caffeine to leave your system, typically 5-6 hours.
How much caffeine affects sleep?
Studies suggest keeping under 50mg in your system for quality sleep.