Tamping compresses ground coffee into an even puck in the portafilter basket, so water flows through it evenly. An uneven or inconsistent tamp is one of the most common causes of channelling, sour shots and inconsistent espresso. The good news is that it’s easy to get right.
Choosing the right coffee tamper size
| Machine | Basket size | Tamper |
|---|---|---|
| Sage Barista Express, Pro, Touch, Bambino | 54mm | 53.3–54mm |
| Gaggia Classic, Lelit, Rocket, E61 machines | 58mm | 58.3–58.5mm |
| Sage Dual Boiler and Oracle | 58mm | 58.3–58.5mm |
A tamper that matches your basket closely leaves no loose coffee around the edge, which gives a more even extraction.
How to tamp espresso: step by step
- Dose your coffee into the basket, ideally weighed on a scale.
- Distribute the grounds evenly, using a WDT tool or a gentle tap.
- Rest the portafilter on a flat surface or tamping mat.
- Hold the tamper like a torch, with your wrist straight.
- Press down firmly and evenly until the coffee stops compressing.
- Keep it level, then lift straight up without twisting.
How hard should you tamp?
You’ll often read 15kg or 30lb, but what really matters is consistency. Press firmly until the coffee won’t compress any further. Spring-loaded or calibrated tampers click at a set pressure, which takes the guesswork out completely.
Calibrated tampers and distribution tools
A calibrated tamper like the Normcore V4.1 Spring-Loaded Tamper, 58.5mm gives the same pressure every time. A WDT tool such as the Subminimal Flick WDT Distribution Tool breaks up clumps before tamping for a more even puck. The KNODOS Walnut Espresso Accessories Kit, 58.5mm brings tamper, distributor and mat together.
Common tamping mistakes
- Tamping at an angle, which causes water to channel down one side.
- Banging the portafilter after tamping, which cracks the puck.
- Inconsistent pressure from shot to shot.
- Using a tamper that’s too small for the basket.
Distribution: the step before tamping
Before you tamp, the coffee needs to be evenly spread in the basket. Clumps and uneven beds create weak spots where water rushes through. Use a WDT tool to stir the grounds with fine needles, or gently tap the portafilter to level the bed. Distribution tools that sit on top of the basket can also level the surface before you tamp.
Choosing a coffee tamper
- Flat base: the most common and easiest to keep level.
- Ripple or convex base: designed to help water distribute, though technique matters more.
- Calibrated or spring-loaded: clicks at a set pressure for consistency.
- Weight and handle: a heavy, comfortable tamper is easier to use well.
Tamping mats and stations
A tamping mat protects your worktop and holds the portafilter level while you tamp. Kits like the KNODOS Walnut Espresso Accessories Kit, 58.5mm include a tamper, distributor and mat.
Signs your tamp needs work
- Shots spurt or run unevenly from the spouts.
- The used puck has holes or cracks.
- Consecutive shots run at very different speeds.
- Coffee tastes both sour and bitter at once.
Tamping with a bottomless portafilter
A bottomless portafilter like the Normcore 58mm Bottomless Portafilter lets you see the underside of the basket while brewing. An even, honey-like stream means a good tamp and distribution; spurts and blonde patches show where it needs improvement.
Frequently asked questions
Does tamping really matter?
Yes. An even, consistent tamp is one of the easiest ways to improve espresso and reduce channelling.
Do I need a distribution tool?
It’s not essential, but a WDT tool makes a noticeable difference, especially with grinders that clump.
What size tamper does the Sage Barista Express need?
A 53.3mm or 54mm tamper fits the Barista Express’s 54mm basket.
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