How Much Caffeine is in a Coffee Bean?

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coffee beans

There’s approximately 6 mg of caffeine in a roasted coffee bean.

There’s approximately 839 mg of caffeine in 100 grams of coffee beans.

The caffeine in coffee is its best feature. We all love the pick-me-up coffee offers. An eight-ounce cup of coffee has about 155 milligrams of caffeine in it. But how much caffeine is in a single bean? It is a much smaller amount, of course, but it varies depending on the type of bean and the amount of time it’s roasted.

Caffeine in Raw Beans

Raw coffee beans have a different caffeine profile than roasted beans, because the roasting process draws out some of the caffeine. The longer a bean is roasted, the more caffeine is pulled out. Let’s look at the amount of caffeine a bean has before it is roasted.

There are two different types of beans widely used for coffee consumption in the U.S.: Arabica and Robusta. Arabica coffee is considered much higher in quality and is used more commonly than Robusta beans. Raw Arabica beans have 1.2% caffeine, while raw Robusta beans have 2.2% caffeine. When roasted, Robusta beans retain more caffeine content than Arabica beans. While it might seem tempting to drink Robusta for the higher caffeine content, it might not be worth it. Arabica beans tend to have more developed flavors that handle roasting much better.

Caffeine in Roasted Beans

As raw beans, Arabica beans have less caffeine than Robusta beans. The same applies to the amount of caffeine in a roasted bean. Arabica beans have about half the amount of caffeine as Robusta beans after they are roasted. The amount of caffeine in a single Arabica bean is about six milligrams. A Robusta bean has 10 milligrams of caffeine after roasting.

The caffeine content can depend on the roast level as well. As mentioned before, the more a bean is roasted, the less caffeine is retained. A single light roasted bean actually has 15%-20% more caffeine than a dark roasted bean. That might sound like a large enough number to make a difference, but for a little bean, it actually isn’t much. The difference in caffeine levels between roasts when compared as whole cups of coffee is slight, but still interesting.


Now you know that there are six milligrams of caffeine in an average roasted Arabica bean, and that Robusta beans actually have more caffeine, but aren’t as widely used. You also learned that raw beans have more caffeine than roasted beans, because the roasting process decreases the caffeine level. We also shared that the roast level can vary the amount of caffeine vastly between single beans, but doesn’t make a big difference once it comes down to the whole cup. There you go: all the coffee knowledge about how much caffeine is in one bean.

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