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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.
A 6-ounce cup of regular coffee contains between 75-150 milligrams of caffeine, according to Johns Hopkins researchers. Instant coffee has less, an average of about 70 milligrams, while an espresso contains about 40 milligrams. Six ounces of brewed tea has about 30 to 90 milligrams of caffeine. A 12-ounce cola may have 30 to 60 milligrams. An 8.4-ounce can of Red Bull Energy Drink boasts 80 milligrams.