Coffee is the biggest dietary source of caffeine.
You can expect to get around 95 mg of caffeine from an average cup of coffee. However, this amount varies between different coffee drinks, and can range from almost zero to over 500 mg.
This is a detailed guide to the caffeine content of different types and brands of coffee.
The caffeine content of coffee depends on many factors, such as:
- Type of coffee beans: There are many varieties of coffee beans available, which may naturally contain different amounts of caffeine.
- Roasting: Lighter roasts have more caffeine than darker roasts, although the darker roasts have a deeper flavor.
- Type of coffee: The caffeine content can vary significantly between regularly brewed coffee, espresso, instant coffee and decaf coffee.
- Serving size: “One cup of coffee” can range anywhere from 30–700 ml (1–24 oz), greatly affecting the total caffeine content.