Headspace Calculator

Calculate your portafilter clearance and master the penny test. Optimize your extraction consistency with professional precision.

Configuration

Basket Size (mm)

Coffee Dose (g) 18g

Roast Level (Density Factor) Medium

Light Medium Dark

Estimated Headspace

2.5 mm

Perfect range for standard espresso.

SVG cross-section visualization.
Represents relative space under group head.

Dose and tamp your coffee as usual. Ensure the surface is level.

Place a standard penny (or similar coin) flat in the center of the tamped coffee puck.

Lock the portafilter into the group head, remove it, and check the coin impression. Clear impression = perfect headspace.