Walk into any coffee shop and you'll see the words: light, medium, dark. Sometimes with modifiers: medium-light, medium-dark, French roast, Italian roast, espresso roast. They're supposed to help you choose. For most people, they don't.
Here's what the labels are actually telling you. And what they're leaving out.
What Roasting Does
Before getting into levels, it helps to understand what roasting is doing in the first place.
A green coffee bean is dense, hard, and mostly tasteless. It contains hundreds of compounds, sugars, amino acids, chlorogenic acids, lipids, but in their raw form they produce almost nothing we'd recognise as coffee flavour. Roasting applies heat over time, driving a series of chemical reactions that transform those compounds into the aromatic molecules responsible for everything we taste and smell.
The two key reactions are the Maillard reaction (the browning of amino acids and sugars, responsible for roasted, nutty, bread-like flavours) and caramelisation (the breakdown of sugars, which produces sweetness, complexity, and eventually bitterness). Both happen throughout the roast, but at different rates depending on temperature and time.
This is why roast level matters: it's a proxy for how far those reactions have progressed.
Light Roast
Light roasts are pulled early: before or just after first crack, the point at which steam and CO₂ inside the bean force an audible pop. The bean's internal temperature is typically around 195–205°C.
At this stage, the Maillard reaction has done some work but caramelisation is incomplete. The bean retains more of its original chemical character: the acids, the fruit-forward compounds, the terroir of the origin.
What you taste: Brightness, acidity, floral and fruity notes. A light-roasted Ethiopian bean might taste genuinely of blueberry or jasmine. The coffee tastes of where it came from.
What you lose: Body, sweetness, the familiar "roasted" depth. Light roasts can taste sharp or thin to palates expecting something darker. Caffeine is higher: the bean hasn't had time to break down as much.
Medium Roast
Medium roasts continue past first crack into what roasters call the development phase. Internal temperatures around 210–220°C. The colour has deepened to a warm brown; the bean's surface is dry.
The reactions have progressed further. Acidity has mellowed. Caramelisation has added sweetness and body. The origin character is still present but softened, integrated.
What you taste: Balance. Sweetness alongside some brightness. Chocolate, caramel, nuts. Origin notes that are more suggestion than statement. Most people find medium roasts the most approachable.
What you lose: The extremes. Neither the vivid fruit of a light roast nor the punchy bitterness of a dark one. Some find this desirable; others find it bland.
Dark Roast
Dark roasts push into and sometimes through second crack — a second, faster set of sounds indicating significant cellular breakdown. Internal temperatures above 225°C. The bean's surface is oily; the colour is deep brown to near-black.
By this point the Maillard reaction and caramelisation have run long, producing bitter, smoky compounds. Origin character is largely gone: what you're tasting is roast character. Different dark-roasted coffees taste more similar to each other than light-roasted ones do.
What you taste: Bold, bitter, smoky. Body is heavy. Acidity is very low. For some palates, this is exactly right: assertive, familiar, reliable. Blends well with milk.
What you lose: Nuance. Any delicacy the bean started with has been roasted away. Caffeine, counterintuitively, is lower: more has been broken down during the longer roast.
What the Labels Don't Tell You
Here's the thing: there is no universal standard for what "light" or "dark" means. One roaster's medium is another's dark. Specialty roasters tend to roast lighter than commercial ones. The bean on the bag marked "medium" at a supermarket would likely qualify as dark by specialty standards.
The label also tells you nothing about the bean quality, the origin, or the freshness: all of which matter more than roast level to the final flavour.
This is one reason home roasting is interesting. When you control the roast yourself, you learn the language from the inside. Light isn't an abstraction — it's the sound of first crack and the decision to stop. Dark isn't a preference — it's the moment you pushed further and tasted why you might not do that again.
The labels collapse into something real.
Roast to your own taste with our home roasting kit. Join the waitlist and we'll be in touch.