how many mg of caffeine in a cup of coffee?
Toxic doses, over 10 grams per day for an adult, are much higher than typical doses of under 500 milligrams per day. A cup of coffee contains 80â175 mg of caffeine, depending on what bean (seed) is used and how it is prepared (e.g. drip, percolation, or espresso). Thus it requires roughly 50â100 ordinary cups of coffee to reach a lethal dose.