How to Use the Coffee Bean Origin & Roast Caffeine Guide
Coffee's caffeine content varies more than most people expect depending on origin, species, and roast level. This tool combines four representative origins — Ethiopia, Brazil, Colombia, and Vietnam — with light, medium, and dark roast levels to show an estimated caffeine content per 100g, and calculates the total estimated caffeine in whatever amount of beans you actually use.
Species matters more than origin on its own. Ethiopia, Brazil, and Colombia mostly grow Arabica, which tends to be smoother and lower in caffeine. Vietnam, by contrast, grows a much higher share of Robusta, which has nearly double the caffeine of Arabica — part of why Robusta-heavy coffee tastes noticeably stronger and more bitter.
Roast level can be counterintuitive and trips a lot of people up. Gram for gram, darker roasting burns off a bit more caffeine as beans are exposed to heat longer, so caffeine content per gram edges down slightly toward dark roast. But dark roast beans lose more moisture and become lighter and larger in volume, so if you're scooping by volume rather than weighing your beans, a dark roast scoop actually contains fewer beans — and often even less total caffeine — than the same scoop of light roast.
Frequently Asked Questions
Gram for gram, caffeine drops slightly as roasting gets darker. But dark roast beans are lighter and take up more volume, so scooping by volume rather than weight can mean fewer beans — and even less caffeine — per scoop.
Species matters more than origin alone — Arabica versus Robusta. Vietnamese Robusta often has close to twice the caffeine of Arabica beans from origins like Ethiopia, Brazil, or Colombia.