- How much caffeine is in a cup of coffee?
About 95 mg in an 8 oz cup of brewed coffee and about 63 mg in a shot of espresso. Caffeine in 13 coffee drinks, from cold brew to decaf, per cup and per ounce. - Dry January 2027
Dry January is 31 days without alcohol, from 1 to 31 January. How it started, what a month off changed in one study, and how to count your dry days. - How long does alcohol last?
Blood alcohol falls about 0.015% an hour, so a BAC of 0.08% takes about 5 hours 20 minutes to reach zero. Tables by BAC and by drink, and what does not help. - How long does caffeine last?
Half of it clears in about 5 hours, so a 95 mg coffee still leaves 46 mg after 6 hours. Hour-by-hour tables for coffee, tea, cola and energy drinks. - How much caffeine is too much?
The FDA's figure for most healthy adults is 400 mg a day, about four 8 oz cups of coffee. The limits for one dose, pregnancy and teens, and signs of too much.
Every drink has its own page in the drink guide. The calculators: water intake, caffeine and BAC.
