But the amount of caffeine in your coffee or tea will depend directly on how long you brew the beverage. When coffee grounds are in contact with water for a longer period of time, there will be more caffeine in your cup of Joe. When you steep a teabag for longer, your cup of tea will have a higher caffeine content.
The complexities don’t stop there. Dark roasted coffee beans are known to have a lower caffeine content than light roasted coffee beans as caffeine is lost in the roasting process. Arabica coffee beans also have a lower caffeine content than Robusta coffee beans.