Espresso Basket Sizes: Single, Double, Triple — Which Dose Fits?

Espresso baskets look like interchangeable metal cups and are not. Each one is engineered around a specific dose — a specific mass of coffee that produces a puck of the right depth with the right headspace under the shower screen. Put in less than the basket wants and the puck sits too low, water pools above it, and the shot gushes and tastes sour. Put in more and the puck swells into the screen, gets imprinted, and channels. The basket is the dose. It is not adjustable.

What each basket holds

• Single: about 7–9 g. One small shot. Notoriously difficult — a shallow bed channels easily — and largely abandoned by home baristas.
• Double: about 14–18 g, with 18 g the modern standard. This is the basket almost everyone should use, for one drink or two.
• Triple: about 20–22 g. For big milk drinks or two servings at once. Needs a deeper portafilter and enough clearance under the group.
• Bottomless portafilters use these same baskets — the naked base changes what you can see, not what you can dose.

The word 'double' confuses people into thinking it makes two drinks. It does not. A double basket makes one normal espresso by every modern standard — a roughly 18 g dose pulling around 36 g of liquid. The 'double' is historical, from an era when a single was the default serving. Treat the double as your one and only basket unless you have a specific reason otherwise.

The rule that decides it: dose sets ratio

Once you know your basket's dose, your ratio is arithmetic. A standard espresso is roughly 1:2 — 18 g of coffee in, about 36 g of liquid out, in 25 to 30 seconds. That single relationship is what makes shots repeatable, and it only works if the dose is fixed. This is why weighing your dose matters more than almost anything else you can do: the same 18 g every morning means the same target yield every morning, and grind becomes the only variable you are adjusting.

It is also why 'fill it to the top' fails. Coffee density varies with roast level and bean, so a scoop that is 18 g of a dark roast is 15 g of a light one. Volume lies. Mass does not.

Pressurised vs standard baskets

Most entry-level machines ship with a pressurised (dual-wall) basket: a normal-looking basket with a second floor and a single pinhole. It creates artificial back-pressure so that pre-ground supermarket coffee produces something crema-like. It is a training wheel, and it caps your ceiling — grind changes barely matter, because the pinhole is controlling flow, not the coffee bed.

Switching to a standard single-wall basket is the moment espresso starts responding to what you do. It also immediately exposes every flaw: you will need a real grinder, a correct-size tamper and even distribution, because nothing is compensating for you any more. That is the point.