Skip to content
BrewnoteAll articles

Coffee Roast Levels

Light, medium and dark describe how far a bean went in the roaster — not its strength.

Roast level is a measure of applied heat and time, marked by two audible events. First crack, around 385°F, is when moisture inside the bean flashes to steam and the structure pops. Second crack, near 435°F, is the cell walls fracturing as oils migrate to the surface. Light roasts stop shortly after first crack; dark roasts run into or past second.

The persistent myth is that dark roast is stronger. It tastes more intense because roasting develops bitter, smoky compounds, but roasting also burns off a small amount of caffeine — so by weight, light roast holds marginally more.

What you'll learn

  • What first crack and second crack are, and the temperatures where they happen
  • Why light roast tastes acidic and dark roast tastes smoky, chemically
  • The scoop-versus-scale trap that makes the caffeine question flip its answer
  • How to roast at home in a pan, an oven or an air popper

4 articles on roast levels

Common questions about roast levels

Which roast has more caffeine, light or dark?

Measured by weight, light roast has slightly more, because roasting degrades a small fraction of the caffeine. Measured by scoop, dark roast often has more, because dark beans are less dense so a scoop holds more of them. Both statements are true; they answer different questions.

Is dark roast less acidic?

Yes, measurably. Longer roasting breaks down chlorogenic acids, and darker roasts test slightly higher on the pH scale. Whether that is gentler on a given person's stomach is much less well established.

What does 'blonde roast' mean?

It is a marketing term for a light roast, popularised by large coffee chains. There is no industry standard behind it, so blonde from one roaster may be lighter or darker than blonde from another.

Related topics