How much pressure do I need when tamping?
About 10–15 kg — more is simply unnecessary. It is far more important that the tamper is level and the pressure is consistent. A crooked tamp causes way more damage than too little force.
Why that is
The question of the ideal tamping pressure is one of the most debated topics in the espresso world — yet the answer is simpler than many think. It’s less about raw force and much more about two other factors: consistency and alignment.
For a long time, the standard advice was 15–20 kg of pressure. Some guides even pushed for 30 kg. Modern understanding has proven these figures to be overkill. Around 10 kg, the coffee grounds reach maximum compression — pushing harder doesn't compact them any further, it just puts unnecessary strain on your wrist.
Why is the exact pressure ultimately irrelevant? Because the espresso machine hits the puck with 9 bars of pressure. Across the surface area of a 58mm basket, that equates to roughly 240 kg of force. Compared to that, the difference between a 10 kg and a 20 kg tamp is entirely negligible — the water will compress the puck further anyway.
What does make a measurable difference, however:
Consistency. If you tamp with 10 kg in the morning and 20 kg in the afternoon, your extraction time will shift. Your grind setting will suddenly be off. Whatever pressure you choose — make sure it's the exact same every single time.
Alignment. A crooked tamp creates a puck that is thicker on one side than the other. The pressurized water will take the path of least resistance through the thinner side — resulting in channeling. A perfectly level tamp at just 8 kg will yield better espresso than a slanted tamp at 20 kg.
Calibrated tampers remove all the guesswork. They compress a spring and yield at a predefined pressure (e.g., 15 kg), signaling that you're done. This guarantees consistency without you having to think about it.
In practice at Green Wall Coffee
At Sophienstraße 27, I tell new staff: press it straight, press it evenly, and don't worry about the kilos. A calibrated tamper helps tremendously — it completely removes that variable from the equation. If you don't have one at home: press your tamper down onto a bathroom or kitchen scale until it hits 10–15 kg to feel what that amount of force is like. That's all the reference you need.
Feel free to drop by for a coffee — Green Wall Coffee, Sophienstraße 27 in Berlin-Lichtenberg, Mon–Fri 8am–5pm and Sat 10am–5pm.
Further reading
In-depth article: How to Make Perfect Espresso
Related questions:
- What is channeling and how do I prevent it?
- Why does my espresso have no crema?
- My espresso gushes through — what to do?
Also relevant:
- What equipment do I need for good coffee at home? — Coffee at Home vs. at a Cafe
- What distinguishes espresso from regular coffee? — Coffee Drinks & Specialties
All questions in this topic: Espresso Preparation (Portafilter)