Light, Medium or Dark: How to Choose Your Coffee Roast
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Roast level is the single biggest decision you make when buying coffee, and it's the one most people guess at. Here's the short version: light roasts taste more like where the coffee grew, dark roasts taste more like the roast itself, and neither is better. They're different, and which one you want depends on what you're after.
The longer version is worth five minutes, because almost everything people believe about this is slightly wrong.
What roasting actually does
Green coffee doesn't taste like anything you'd want to drink. It's grassy and dense and inert. Roasting is what turns it into coffee — and what happens inside the bean is a series of chemical reactions triggered by heat.
Sugars caramelise. Acids break down. Moisture leaves, so the bean loses mass and expands, becoming lighter and more brittle. Oils migrate toward the surface, which is why very dark beans look shiny and lighter ones look matte.
The longer you roast, the more the roast's own character replaces the bean's. That's the whole trade-off, and every other difference follows from it.
Does light roast have more caffeine?
Yes, but less than the internet claims.
Caffeine is fairly stable under heat — it doesn't burn off dramatically the way people suggest. What changes is density. Dark roasted beans have lost more moisture and expanded more, so they weigh less per bean.
That means: if you measure by scoop, light roast gives you more caffeine, because you're fitting more actual coffee into the same volume. If you measure by weight, the difference is small enough that you'd struggle to notice it.
So the honest answer is that roast level is a poor way to control caffeine. If you want more, the reliable route is a blend containing Robusta, which carries roughly twice the caffeine of Arabica.
Which roast is less acidic?
Dark, clearly and measurably.
Coffee's acidity is driven largely by chlorogenic acids, and roasting breaks them down. Research puts brewed coffee at around pH 5.0 for light roasts and around 5.3 for dark — a real difference, though a smaller one than most "low acid coffee" marketing implies.
In practice, this is why some people who find coffee harsh on the stomach get on better with darker roasts. It's also why light roasts taste bright and fruity: that acidity is what carries the fruit.
One thing to be careful about: acidity in coffee tasting doesn't mean sour or harsh. It means liveliness — the quality that makes a Kenyan taste like cherry and grapefruit rather than flat brown liquid. Acidity is usually a compliment.
Is dark roast stronger?
No, though it tastes like it should be.
"Strong" gets used for three different things: caffeine content, flavour intensity, and brew concentration. Dark roast is more intense in flavour — smokier, more bitter, more roast-forward. It doesn't have more caffeine, and strength in the sense of concentration is about your brewing ratio, not your beans.
A weak cup of dark roast is still weak. A strong cup of light roast will keep you up.
So which should you buy?
Choose light if you want to taste where the coffee came from. Light roasts keep the origin character — the florals in an Ethiopian, the citrus in a Kenyan, the delicacy that gets roasted out at darker levels. Best brewed as pour-over, where clarity is the point.
Choose medium if you want balance, or you're not sure. Medium is where most single origins land because it's the level that keeps origin character while adding enough body and sweetness to be forgiving. It's also the most flexible across brewing methods.
Choose dark if you want boldness, low acidity, or a cup that stands up to milk. Dark roasts are also the most forgiving of imprecise brewing — hard to make a genuinely bad cup.
A practical way to find out
Buy one coffee from each end of the range and drink them a week apart, black, made the same way. You'll learn more in two weeks than in any amount of reading — including this.
Most people discover they're less extreme than they assumed. Committed dark roast drinkers often turn out to like a medium. People who think they hate light roast usually hate badly brewed light roast.
Where ours sit
We roast across the full range, so there's a point on the ladder for wherever you land.
Light: Breakfast Blend Sunrise Roast — walnut, mild apple, toffee. Blonde — sweet and bright, built for espresso.
Medium: our thirteen single origins live here, from Colombian dark chocolate and mango to Kenyan cherry and grapefruit. House Blend and Breakfast Blend if you want smooth and consistent.
Medium-dark: Latin American and African Kahawa — more body, origin character still intact.
Dark: Cowboy Blend mixes dark and medium roasts in one bag. French Roast is a proper dark roast that keeps its sweetness. 6 Bean is six origins built for espresso.
Darkest: Italian Roast Robusta, slow roasted so it's intense rather than scorched. And Italian Roast Deep Dive, extra dark and oily, where acidity is gone and origin character is deliberately roasted out.
Whichever you choose, it's roasted and ground the day you order and ships within 48 hours — because roast date affects your cup more than roast level does, and that's a subject for another day.