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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.
Caffeine by Starbucks Decaf Coffee Cup Size. The above amounts are posted by Starbucks, however, other independent tests found different results. Tests undertaken by the University of Florida showed that a 16oz serving of decaffeinated brewed coffee had caffeine concentrations of 12 to 13.4 milligrams.