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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 80â175 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 50â100 ordinary cups of coffee to reach a lethal dose.
How much caffeine is in my cup of coffee? According to the National Coffee Association (NCA), a typical cup of drip coffee (8oz) contains approximately 65-120 mg of caffeine. With such a wide variation in caffeine content, its very difficult to assess how much caffeine you are consuming from a typical cup of coffee.