Caffeine Calculator
Track your caffeine intake and see how it affects your system
Disclaimer: Caffeine metabolism varies significantly between individuals based on genetics, liver function, medications, and other factors. The 400mg daily limit is for healthy adults - pregnant women, children, and those with certain health conditions should consume less. Consult a healthcare provider for personalized advice.
Settings
Half-life: ~5.5 hours
Add Caffeine Source
Caffeine Status
0mg
Currently in System
0mg
Total Today
400mg
Daily Allowance Left
0%
of Daily Limit
0h
Until Sleep-Safe
Caffeine Decay Projection
0mg
in 1h
0mg
in 2h
0mg
in 4h
0mg
in 6h
0mg
in 8h
0mg
in 12h
Caffeine Tips
For Better Sleep
Stop caffeine intake 6-8 hours before bedtime. Aim for less than 100mg in your system at bedtime.
For Optimal Energy
Wait 90-120 minutes after waking before your first caffeine. This allows natural cortisol to peak first.
Avoid Tolerance
Consider cycling caffeine intake (5 days on, 2 days off) to maintain sensitivity.