how caffeine is in a cup of coffee
Your Average Cup. A 12-ounce cup of coffee that you brew at home contains about 100 to 160 milligrams of caffeine. Use a coffee maker with coffee pods and you're likely to get between 75 and 150 milligrams per cup. Instant coffee contains between 135 and 148 milligrams per cup. Purchase that cup at a coffeehouse and you'll get between 178 and 260 milligrams in a 12-ounce serving.
A simple idea of how much caffeine is contained in a 7 oz. cup of coffee based on brewing methods is that the highest caffeine content is found in drip coffee, which is 115-175 milligrams, depending on the bean.