Sources of Caffeine
Coffee / Caffeine (mg)
Coffee, brewed, 8 oz / 100 to 200 mg
Coffee, instant, 8 oz / 27 to 173 mg
Espresso, 1 oz / 75 mg
Decaffeinated coffee has 97% of its caffeine removed.
Tea / Caffeine (mg)
Tea, brewed, 8 oz / 40 to 120 mg
Caffeine content depends upon the type of tea.
Other / Caffeine (mg)
Cola, 12 oz / 35 mg
Chocolate bar, 1.55 oz / 9 mg
Energy drinks, supplements, and pain medicine vary depending on brand. Check the label or with the manufacturer for exact amounts of caffeine.