STIMTRACE / CAFFEINE CLEARANCE ESTIMATOR

Caffeine half-life calculator

Estimate how much caffeine may remain in your system at bedtime. Add coffee, tea, energy drinks, chocolate, or a custom drink and adjust the half-life to model your day.

Calculate caffeine remaining at bedtime

StimTrace applies exponential half-life decay to every drink in your timeline. Chocolate can also include a separate theobromine curve and a clearly labeled combined estimate.