What is Portafilter Size?
The diameter of the filter basket holder.
Measured in mm
Definition
Portafilter size is measured in millimeters and determines the filter basket diameter. 58mm is commercial standard, 54mm is common in prosumer machines, and smaller sizes are found in entry-level machines.
Why It Matters
Larger portafilters hold more coffee and provide more even extraction.
What to Look For
54mm minimum, 58mm for commercial-style
Compare Home Espresso Machines Products
See how portafilter size compares across different products.