How to pull an espresso shot

Pulling espresso is a repeatable recipe with one variable you adjust: grind size. Everything else — dose, water, pressure, time — you hold constant, and then you move the grinder until the shot runs at the right speed. Once that clicks, the whole thing becomes simple, and this guide is built around it.

The four numbers to know before you start. Dose:18–20g of coffee for a standard double basket, weighed, not scooped. Yield:about twice the dose in liquid espresso — so 36–40g out from an 18–20g dose, which is the 1:2 ratio. Time: 25–30 seconds from the moment the pump starts. Temperature: around 200°F, which your machine handles if you let it warm up properly.

What you need

A machine with a non-pressurized basket (if yours has a pressurized dual-wall basket, the basket is doing the work and most of this guide will not apply), a burr grinder that adjusts finely, a scale reading to 0.1g, a tamper that matches your basket diameter, and fresh whole beans with a printed roast date, ideally 7–21 days off roast. A WDT tool is optional but makes step 4 far more effective.

The nine steps

1. Warm the machine and the portafilter

Switch the machine on and give it the time its design needs — seconds for a ThermoJet or thermoblock, 15 to 25 minutes for a boiler machine. Leave the portafilter locked into the group while it heats; a cold portafilter pulls heat out of your shot and gives you a sour, thin result no amount of grind adjustment fixes. Run a blank shot of water through the group before you start, both to flush old coffee and to bring the group head to temperature.

2. Weigh the dose

Put the portafilter and basket on the scale, tare, and grind straight in until you hit your target — 18g is a sensible starting dose for most double baskets. Weighing matters because volume is not mass: the same scoop of a light roast and a dark roast are different amounts of coffee, and an inconsistent dose makes every other adjustment meaningless.

3. Grind fresh, every time

Ground coffee begins losing aromatics within minutes and stales properly within an hour, so grind immediately before brewing. Grind fine — espresso fine is roughly the texture of powdered sugar, noticeably finer than table salt. Your exact setting depends on your grinder, your beans and how old they are, and you will change it as the bag ages.

4. Distribute the grounds

Coffee leaves a grinder in static-bound clumps, and clumps create dense and loose regions in the puck. Break them up: stir the grounds with a WDT tool for ten to fifteen seconds, working around the basket, going about two thirds of the depth. If you have no WDT tool, a straightened paperclip does the same job more slowly. Then level the surface. This single step removes most shot-to-shot inconsistency for most people.

5. Tamp once, level and firm

Set the tamper flat on the coffee and press straight down until the puck stops compressing — roughly 20–30 pounds of force, though the exact number matters far less than people think. What matters enormously is level. A tamp even slightly off-axis leaves a thinner region of coffee on one side, and water will find it. Do not twist, do not tamp twice, and do not knock the portafilter afterwards — a knock cracks the puck.

6. Lock in and start immediately

Wipe any loose grounds off the rim so the gasket seals, lock the portafilter into the group, and start the pump straight away. A tamped puck sitting in a hot group head begins to over-heat and dry out, and the first few seconds of a shot are the most sensitive to that.

7. Watch the first ten seconds

Espresso should not appear immediately. Expect three to seven seconds before the first drops, then a slow, dark stream that thickens into a steady honey-colored flow. If coffee gushes out in the first two seconds, your grind is too coarse. If nothing appears after ten seconds, it is too fine. This is the fastest diagnostic you have and it happens before the shot is even over.

8. Stop at your target weight

Brew onto a scale and stop the pump when the cup reaches your yield — 36g out from an 18g dose. Do not brew to a time and do not brew to a line on a cup; weight is the only reliable measure, because espresso volume changes with crema. Note the total time it took.

9. Taste, then adjust one thing

Taste it before you decide anything. Then adjust only the grind, and only in one direction, and pull again. Changing two variables at once means you learn nothing from the result.

The adjustment loop

Change the grind by one step at a time, and expect to throw away two or three shots when you open a new bag. That is normal, not failure — and it is why enthusiasts talk about “dialing in” a bag rather than a machine.

The things that ruin more shots than technique

Stale beans.Coffee older than about six weeks off roast pulls badly under pressure no matter what you do; coffee less than four days off roast off-gasses CO2 and gushes unpredictably. The 7–21 day window is where espresso is easiest.

A grinder that cannot go fine enough.If your finest setting still runs a shot in 15 seconds, no technique fixes it — the grinder is the problem. This is why we push people toward espresso-capable grinders over spending more on the machine.

A tamper that does not match the basket.A 58mm tamper in a 58mm basket leaves a ring of uncompressed coffee at the wall, which is a ready-made channel. That is why 58.5mm tampers exist. Check your machine’s basket diameter before buying.

Not weighing anything. Without a scale you cannot tell whether a change worked, because you do not know what changed. A $25 scale is the highest-leverage purchase in espresso.

After the shot: milk, or not

If you are making a milk drink, steam while the shot is still hot — espresso goes bitter-tasting as it cools and sits. Whole milk textures most easily; stop at 140–150°F. Our latte vs cappuccino guide covers the ratios, and the machines with milk frothers page covers the hardware.

Then clean up: knock the puck into a knock box, rinse the basket, run a short flush through the group, and wipe the steam wand. Old coffee in a basket is the most common reason a machine that used to make good shots stops.