Question: how much caffeine in a 16oz cup of coffee?
Answer: Larger sizes, which are made with two, or even three, espresso shots (16 oz), likewise contain 150 or 225 mg of caffeine. Decaf coffee from Starbucks contains 15–30 mg of caffeine, depending on cup size. Bottom Line: An 8-oz, brewed coffee from Starbucks contains 180 mg of caffeine.