Caffeine tools

Calm, readable estimates for caffeine amount and timing, using the same chart language as the drink archive.

Caffeine Half-Life Calculator

Estimate how much caffeine may remain in your system throughout the day.

Stack energy drinks by time: day totals for caffeine, sugar, and calories, plus a decay estimate.

Visualize your Energeia Tracker export: daily caffeine, time of day, and an optional decay estimate.

Looking up a specific can? Browse the energy drink database for verified caffeine and sugar, or track what you drink in Energeia.