Flat burr vs. Conical Burr Grinders
Part of the Espresso Knowledge series.
Introduction
When researching espresso grinders you will often see references to flat burr and conical burr designs.
Both are used to grind coffee beans for espresso and other brewing methods. The difference lies in the shape of the grinding components and how they process the coffee beans.
Some links on this page are affiliate links. If you choose to purchase through them, it helps support the site at no additional cost to you.
What Is a Flat Burr Grinder?
A flat burr grinder uses two flat circular grinding discs positioned horizontally.
Coffee beans pass between these discs where they are crushed into smaller particles before exiting the grinder.
Flat burr grinders are known for producing very consistent grind sizes, which is particularly important when preparing espresso.
What Is a Conical Burr Grinder?
A conical burr grinder uses a cone-shaped inner burr that rotates inside a ring-shaped outer burr.
Coffee beans fall between the two burrs and are ground gradually as they move downward through the grinder.
This design is widely used in both home and commercial grinders because it is efficient and relatively quiet.
Key Differences
The main differences between flat and conical burr grinders include:
• Burr shape – flat discs versus cone-shaped burrs
• Grinding path – beans move horizontally in flat burr grinders and vertically in conical burr grinders
• Noise and speed – conical burr grinders are often quieter
Both designs are capable of producing excellent espresso when well engineered.
How burr type can influence flavour
While the primary role of a grinder is consistency, burr type can also influence how coffee tastes in the cup.
Flat burr grinders tend to produce a more uniform grind size, which can lead to a cleaner and more defined flavour profile. This often makes it easier to distinguish individual tasting notes, particularly in lighter or more complex coffees.
Conical burr grinders, on the other hand, typically produce a slightly wider range of particle sizes. This can result in a fuller body and a more rounded, blended flavour, often associated with traditional espresso profiles such as chocolate and nutty notes.
These differences are subtle and should be seen as general tendencies rather than fixed rules. Burr design, grinder quality, and the coffee itself all play a role, but understanding this can help explain why different grinders can produce slightly different results, even when dialled in correctly.
Where These Designs Are Found
Flat burr grinders appear in many enthusiast grinders such as the DF64 Coffee grinder.
Conical burr grinders are commonly used in machines such as the Baratza Sette 270 and the Niche Zero grinder.
Flat burr designs are also used in integrated grinder systems found in machines such as the Sage Barista Pro and Sage Barista Touch.
If you're pairing a grinder with an entry-level espresso machine, our guide to espresso machines under £500 shows the types of setups these grinders are commonly used with.
Explore Further
If you would like to explore how grinders affect espresso preparation, see our guide:
This article explains why grinder quality plays such an important role in making good espresso at home.
Conclusion
Flat burr and conical burr grinders represent two different engineering approaches to grinding coffee. Both designs can produce excellent espresso, and each appears in many well-respected grinders used by home enthusiasts.
