Mike Camp/Getty Images
The content of caffeine in chocolate varies with the brand and type of chocolate. On average, milk chocolate contains about 18 mg of caffeine per 100 grams (about 3.5 ounces). This doesn’t look like much, but it’s easy to add up.
Dark chocolate contains more caffeine than milk chocolate, and every 100 grams of chocolate bar contains more than 70 mg of caffeine (almost equivalent to a cup of coffee).
Some manufacturers add extra caffeine to the chocolate to produce a stronger caffeine content—usually about 100 milligrams of caffeine per piece, which is about the same as the caffeine content of a cup of espresso. Other types of caffeinated candies, mints and chewing gum are also available. White chocolate usually does not contain caffeine.