14-22 mg caffeine. According to relevant data, the caffeine content of coffee beans depends on many factors, such as the type of coffee beans, the degree of roasting, the production method and so on. Generally speaking, every 100g coffee bean contains about 40-60mg caffeine. Therefore, 36 grams of coffee beans contain about 14-22 milligrams of caffeine. However, it should be noted that this is only a rough estimate, and the specific caffeine content will also be affected by other factors, such as coffee making methods, cup size and so on. In addition, caffeine has different effects on different people, so it is recommended to drink coffee in moderation to avoid adverse effects on the body.