… that contrary to popular belief, dark roasts do not pack more caffeine than light roasts? In fact, light and dark roasted beans have the same amount of caffeine per bean, but if you’re measuring the amount of beans to grind by volume (i.e., with a spoon) rather than by weight, then your brewed cup of dark roast will have less caffeine than the same volume of a light roast because beans taken to a darker roast expand to a larger size, so your spoonful of French roast beans will have fewer beans than a spoonful of lighter roasted beans. And fewer beans means less caffeine. Moral of the story: always weigh out the amount of beans to use for the cup or pot that you’re going to brew if you want the same caffeine kick regardless of roast level.