Last coffee
Caffeine Calculator
Coffee, espresso, tea, cola, energy drink with time: how much caffeine is still in your blood at bedtime, as a curve.
The calculation assumes a half-life of five hours, as for most adults; slow metabolizers need up to ten. Caffeine amounts per drink are reference values. Background in Caffeine and sleep.
Not medical advice: the calculator classifies, it does not diagnose.
