What’s the difference between light, medium and dark roast?

Light roast coffee is light and fresh in flavour, medium roast is balanced and rounded, and dark roast is full and bitter. The difference mainly lies in how long the coffee beans have been roasted.

If you’re looking at coffee beans and see these terms, you’ll probably wonder which one suits you best.

The roasting has a big impact on what you taste. From fresh and light flavours to full and intense coffees: it all depends on how long the bean has been roasted.

But how do you know which roast suits you? Do you go for light and distinctive, or rather strong and full-bodied?

After reading this, you’ll know exactly what the differences are and which roast matches your taste and way of making coffee.

What is light roast coffee?

Light roast coffee beans are roasted for a shorter time than other roasts. This means many of the original flavours of the coffee bean are preserved.

This results in a fresh and lively flavour. You often taste fruity, floral or even slightly acidic notes. This type of coffee clearly shows where the bean comes from, because the origin is less “hidden” by the roasting process.

The beans themselves are lighter in colour and have no oil on the outside. They are also a bit more compact because they have been heated for a shorter time.

Light roast is especially a good choice if you:

  • Enjoy fresh and complex flavours
  • Like trying different coffee regions
  • Make filter coffee or slow coffee (like V60 or Chemex)

If you mainly drink espresso, light roast can be a bit more challenging, because the flavours can come across as acidic if your grind or extraction isn’t quite right.

What is medium roast coffee?

Medium roast coffee beans are roasted a bit longer than light roast, which balances the flavours more.

The result is a coffee that is less acidic than light roast, but not as bitter as dark roast. You often taste a nice combination of light freshness with fuller notes like caramel, nuts or chocolate.

The beans are medium brown in colour and may have a slight sheen from the oils released during roasting.

Medium roast is a popular choice because it:

  • Offers a good balance between acidity and bitterness
  • Is accessible to many coffee drinkers
  • Is suitable for both filter and espresso

If you’re looking for a coffee that’s not too pronounced but still full of flavour, medium roast is often a safe bet.

What is dark roast coffee?

Dark roast coffee beans are roasted the longest. During this process, many of the original fresh flavours disappear and deep, intense tones emerge.

The flavour is full, powerful and often somewhat bitter. You taste less acidity and more notes like dark chocolate, roasted nuts and sometimes even a slight smoky character.

The beans are dark brown to almost black and often have an oily sheen on the outside due to the longer roasting.

Dark roast is a good choice if you:

  • Enjoy a strong, intense coffee flavour
  • Want to taste little to no acidity
  • Drink a lot of espresso or milk-based drinks

Because of its full flavour, dark roast holds up well in cappuccinos and lattes. The coffee flavour doesn’t get lost quickly in the milk.

Light vs medium vs dark roast: the main differences

Still unsure? Below you can see the differences clearly side by side:

Characteristic Light roast Medium roast Dark roast
Flavour Fresh, fruity, complex Balanced, rounded Full, bitter, intense
Acidity High Medium Low
Bitterness Low Medium High
Caffeine Slightly more (per bean) Medium Slightly less (per bean)
Use Filter, slow coffee All-round (filter & espresso) Espresso, cappuccino, latte

In short:

  • Light roast lets the origin and fresh notes shine
  • Medium roast provides balance and accessibility
  • Dark roast is all about strength and intensity

Which roast suits you?

Which roast suits you best mainly depends on how you drink your coffee and what you enjoy.

Go for light roast if you:

  • Enjoy fresh, fruity flavours
  • Like trying different coffees and origins
  • Mainly make filter coffee or slow coffee

Go for medium roast if you:

  • Are looking for a nice balance between fresh and full
  • Don’t want it too acidic or too bitter
  • Drink both filter and espresso

Go for dark roast if you:

  • Enjoy a strong, intense flavour
  • Want little acidity
  • Drink a lot of cappuccinos or lattes

Here’s a simple guideline:
If you drink your coffee black and want to taste more nuance, choose light or medium roast. If you prefer strong and full-bodied, especially with milk, dark roast is often the way to go.

In the end, it’s all about your taste. Trying and comparing is the quickest way to find out what you really enjoy.

Frequently asked questions about roast levels
Which roast is the strongest?
Dark roast tastes the strongest due to the intense, bitter notes. But that doesn’t mean it contains more caffeine.
Which roast contains the most caffeine?
Light roast contains slightly more caffeine per bean because it has been roasted for a shorter time. The difference is small, but it is there.
Is light roast always more acidic?
Light roast has a higher acidity. That gives those fresh and fruity flavours that many coffee lovers enjoy.
What is better for espresso?
Medium and dark roasts usually work best for espresso. They are better balanced and deliver a fuller flavour, especially when combined with milk.