How much caffeine in regular and decaffeinated coffee?

Before the beans are roasted, Arabica beans have about 1% caffeine, and Robusta beans about 2% caffeine by weight. On average, a cup of regular espresso has 90 to 120 mg caffeine. Modern decaffeination process removes about 98% caffeine, resulting in about 3mg of caffeine in a cup of coffee. The flavor of coffee depends on the roast and not on the amount of caffeine.

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