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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 Many Milligrams of Caffeine is in Decaffeinated Green Tea? Naturally decaffeinated green tea contains about 2 milligrams of caffeine per cuppa. An average cup of green tea contains approximately 20-30 milligrams of caffeine depending upon the length of infusion. The longer the infusion time, the more caffeine in the cuppa. You may wonder why a decaffeinated tea would have any caffeine in it at all, but most do. For added information, The Republic of Tea uses only a natural CO2 high-pressure extraction process employing carbon dioxide, one of the most expensive yet effective decaffeination processes.