Caffeine Curfew Calculator
Enter your bedtime and what you drink; get your personal last-call time, built on caffeine's ~5 hour half-life and the sleep research behind the 8-hour rule.
FAQ
How does the curfew estimate work? It uses the commonly cited caffeine half-life range in healthy adults and the verified caffeine content of your drink to estimate how much remains at bedtime. Half-life varies from person to person, so treat the result as a rough guide.
Is this medical advice? No. The FDA cites 400mg of caffeine a day as an amount generally not associated with negative effects in healthy adults. This tool is information, not advice.
Where do the drink numbers come from? The Barista Life verified caffeine dataset, with each entry sourced to published data.