Light Roast vs Dark Roast

The roast level is one of the most significant variables in how coffee tastes, and it is also one of the most misunderstood. The myths about caffeine, strength, and flavor that surround roast levels persist even among regular coffee drinkers.

What happens during roasting

Green coffee beans are roasted by applying heat over a controlled time period. As the beans heat up, moisture evaporates, sugars caramelize, and hundreds of chemical reactions produce the flavor compounds that we taste in brewed coffee. Light roasts stop earlier in this process; dark roasts continue until more of the original compounds have been transformed or driven off.

Light roast flavor

Light roasts preserve more of the coffee's original character: the flavors that came from the origin, the variety, and the processing. This means more acidity, more fruit and floral notes, and more complexity. Light roasts are often described as bright, complex, and tea-like in body. They require more precise brewing technique to avoid sourness from under-extraction.

Dark roast flavor

Dark roasts produce more roast-forward flavors: caramel, dark chocolate, smoke, and bitterness. The original origin character is largely replaced by the roasting process. Dark roasts are more forgiving of inconsistent brewing because the roast character is dominant and masks extraction issues. They work well with milk.

The caffeine myth

Contrary to common belief, light roasts have slightly more caffeine than dark roasts by weight. Roasting drives off a small amount of caffeine, so darker roasts have marginally less. The difference is small enough to be practically irrelevant for most people, but the idea that dark roast equals strong (in caffeine terms) is incorrect.

Which to choose

If you want to taste the coffee's origin character and enjoy complexity: light roast, brewed as pour over or filter. If you want a consistent, forgiving espresso or a milky drink: medium to medium-dark. If you want a bold, traditional flavor that works with sugar and cream: dark roast.

Related reading: how coffee is roasted, tasting notes.

Whichever roast you prefer, Pulled Coffee pays you for visiting the cafes that serve it.