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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.
The highest level of caffeine was in the 5-hour Energy Extra Strength, which contained 242 milligrams. By comparison, Consumer Reports cites that an 8-ounce of coffee has about 100 milligrams, while a 16-ounce Starbucks Grande has about 330 milligrams.