A regular sized cup of coffee (about 5oz) can contain anything from 65 to 125 mg of caffeine. It all depends on the type of coffee and how it's been made: On average there is 110-150mg for filter coffee, 65-125mg for percolated, and 40-80 mg for instant. Typically an 8 oz cup of Starbucks coffee contains165 milligrams of caffeine.
(I looked into this following yesterday's IF, and the amount of caffeine in energy drinks also varies. They can contain between 70 and 200 mg. A Dr. Pepper gives you 61mg, and a can of Coke provides 50mg, but according to Web MD, a full can of 150mg Rockstar energy shot contains a massive 229 mg!
That's not a drink, that's medicine.)
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