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Pull a double espresso at roughly 18 grams of ground coffee in, 36 grams of liquid out, in 25 to 30 seconds, with water at about 200°F and roughly 9 bar of pressure at the puck. Everything else is technique in service of those four numbers. Grind fine, distribute the grounds evenly, tamp level, lock in and start the pump immediately, and stop on weight rather than by eye. If the shot runs fast, grind finer; if it runs slow, grind coarser. Change one thing at a time.
The recipe in four numbers
| Variable | Target | Why it matters |
|---|---|---|
| Dose | ~18 g (match your basket) | Sets the depth of the puck and its resistance |
| Yield | ~36 g (a 1:2 ratio) | Sets concentration and how far extraction runs |
| Time | 25–30 seconds | Your read-out on whether the grind is right |
| Temperature | 195–205°F, about 200°F | Controls extraction speed and balance |
The fifth number, pressure, is set by the machine at about 9 bar at the puck. The 15-bar and 20-bar figures printed on boxes are pump maximums into a blocked line, and a well-designed machine bleeds the surplus off with an over-pressure valve. Ignore them.
What you need
- A burr grinder that reaches espresso fineness. Not optional with a non-pressurised basket — see burr vs blade grinder and the best espresso grinders.
- A scale reading to 0.1 g. About twenty dollars, and it turns espresso from guessing into adjusting.
- Fresh beans, ideally 5 to 35 days past the roast date.
- A timer — your phone is fine.
- Optional but valuable: a needle distribution (WDT) tool to break up clumps before tamping.
The sequence, step by step
Step 1: Warm everything up
Turn the machine on and let it reach full temperature — seconds on a thermoblock machine, 15 to 20 minutes on a machine with a brass group head like a Gaggia Classic Evo Pro or a Rancilio Silvia. Leave the portafilter locked into the group so it heats too, and rinse your cup with hot water. A cold portafilter and cold cup together can cost enough heat to make a balanced shot taste sour.
Step 2: Purge the group
Run two or three ounces of water through the empty group head. This clears old grounds from the shower screen and stabilises the temperature. On a single-boiler machine that has just been used for steam, this is essential — the group will be far too hot otherwise.
Step 3: Grind and weigh
Grind fresh, directly before pulling. Ground coffee loses aromatics within minutes and starts absorbing moisture immediately. Weigh into the basket: target the basket's rated dose, usually about 18 grams for a modern double. If your grinder retains grounds, weigh what actually lands in the basket rather than what you put in the hopper.
Step 4: Distribute
Espresso-fine grounds clump as they leave a grinder, and clumps leave gaps that water will exploit. Stir the grounds in the basket with a needle tool, or with a thin skewer, moving through the whole depth of the bed. Then level the surface. This step does more to prevent channeling than tamping does, and most beginners skip it.
Step 5: Tamp level, not hard
Set the tamper flat on the bed and press straight down with about 20 to 30 pounds of force — roughly the weight of leaning on a bathroom scale to that reading. Beyond that, more force changes nothing: the puck is already compacted. What does matter is that the tamp is level; a tilted puck is thinner on one side, and water will find it. Do not tap the portafilter afterward, which cracks the puck.
Step 6: Lock in and start immediately
Put the cup on the scale, tare it, lock the portafilter into the group, and start the pump. Do not leave a loaded portafilter sitting in a hot group — the grounds start cooking within seconds and the shot will taste burnt.
Step 7: Watch the pour
A good shot begins with two to five seconds of nothing, then dark drips that merge into a steady, tapering stream the color of warm honey. It should look viscous, like thin syrup rather than water. Toward the end it lightens — blonding — as the extractable material runs out.
Step 8: Stop on weight
Cut the shot when the scale reads about 36 grams. Do not judge by volume: crema varies hugely between beans and ages, so a cup that looks right can be 10 grams off. Note the time. Then taste it immediately — espresso changes noticeably within a minute.
Reading the shot
| What you saw | What it means | Change |
|---|---|---|
| Under 22 seconds, pale and fast | Under-extracted, grind too coarse | One step finer |
| Over 35 seconds, dark and slow | Over-extracted, grind too fine | One step coarser |
| Dripped then gushed | Channeling | Better distribution, level tamp |
| Sprayed sideways from the basket | Channeling from a crack in the puck | Stop tapping the portafilter |
| Thick, fast-fading, bubbly crema | Beans too fresh, still off-gassing | Rest 3–5 more days |
| No crema at all | Stale beans, or grind far too coarse | Fresher coffee; grind finer |
Taste is the final judge. Sour and thin means under-extracted — see why espresso tastes sour. Harsh, drying and ashy means over-extracted — see why espresso tastes bitter. Both at once means the puck channeled.
Changing the ratio deliberately
Once 1:2 is working, the ratio becomes a flavor control rather than a fault to fix.
- 1:1.5 (ristretto), 18 g → 27 g. Thicker, sweeter, more intense. Works well with dark roasts and cuts through milk. Tips into harshness easily.
- 1:2 (standard), 18 g → 36 g. The default. Start here with every new bag.
- 1:2.5, 18 g → 45 g. Lighter and often sweeter, and the friendliest ratio for light roasts that resist extraction.
- 1:3 (lungo), 18 g → 54 g. Thin and tea-like, and easily over-extracted since the last of the water is running through spent coffee.
If your machine has pressurised baskets
Look at the underside of your basket. A single tiny pinhole means it is a pressurised (dual-wall) basket, which creates back-pressure by itself regardless of your grind. It will pour slowly and make thick foam even from pre-ground supermarket coffee, which is exactly what it is for.
The recipe above still helps, but time is no longer a useful signal — the restriction, not the coffee, is controlling the flow. If you want the numbers on this page to mean anything, switch to a single-wall basket, and be ready to dial in the grind properly when you do. The best espresso machines for beginners explains which machines ship with which.
Turning a shot into a drink
A latte is one double shot under six to eight ounces of steamed milk; a cappuccino uses less milk and more foam; a flat white sits between them with a thin layer of dense microfoam. The shot recipe does not change — the milk does. See how to steam milk at home for the technique, and the best milk frothers if your machine has no steam wand.
Where to go next
Starting with a new bag or a new grinder? How to dial in espresso grind walks through the process systematically. Shopping? The best espresso machines and the best espresso grinders. Keeping it alive: how to descale an espresso machine. Everything sits under the small kitchen appliances hub.
We never buy or physically handle the products we rank — our picks come from aggregated owner reviews and expert consensus, explained on how we rank.