About this site
CaffeineCutoff answers one question: when's your last cup if you want to sleep tonight?
It exists because the usual answer — a decay chart and a shrug — leaves you doing the arithmetic at 3 pm with a coffee going cold in your hand. So this site does the backward step for you and hands you a time.
It's a small site on purpose: one calculator, one explainer, one cited table of drinks, and a page showing the math. No accounts, no tracking of what you type, nothing to buy. The numbers come from the FDA, USDA FoodData Central, and the drink makers' own published figures — every row on the drinks page names its source.
Questions or a drink we should add? Write to hello@caffeinecutoff.com.