An average cup of brewed coffee contains about 95 mg of caffeine per 8-ounce (240 ml) serving, but this amount can vary widely depending on the brewing method and coffee type. For example, brewed coffee caffeine content ranges from approximately 113 to 247 mg in a 12-ounce cup. Espresso has around 63 to 127 mg of caffeine per 1 to 2-ounce shot, while instant coffee typically contains 45 to 80 mg per 6 to 8-ounce cup. Decaffeinated coffee still contains a small amount of caffeine, typically 2 to 15 mg per 8-ounce cup.
