// caffeine, quantified
How much caffeine is actually still in you?
Small, exact tools for coffee and tea drinkers — how much you drank, how long it lasts, and when to stop for the day. No accounts, no guesswork, just the numbers.
See the tools ↓
CAFFEINE IN BLOODSTREAM
mg / hours
The tools
06 totalHalf-Life Tracker
Enter what you drank and when — see caffeine drop out of your system hour by hour.
Try it →Sleep Cutoff
Tell it your bedtime, get the latest hour you can safely have your last cup.
Try it →Drink Comparison
Coffee vs. tea vs. energy drinks vs. soda — see caffeine per serving side by side.
Try it →Daily Tracker
Log every drink and watch your running total build up against your own limit.
Try it →Brew Ratio
Pour-over, French press, or espresso — get the right water-to-coffee ratio for the strength you want.
Try it →Yearly Cost
See what your daily habit adds up to over a month, and over a year.
Try it →