Track your caffeine metabolism with scientific accuracy.
Caffeine has a biological half-life of about 5-6 hours for the average adult. This tool uses standard pharmacokinetic models to estimate how much 'buzz' remains in your system.
Enter the time and amount of your last coffee. We'll chart the decay curve and tell you when it's safe to sleep without that 'caffeine-crash' insomnia.
Continue your journey through the bigkidmath world.