A double espresso is the standard order in most cafes. Yet at home, confusion reigns: How much coffee goes in? How much liquid comes out? And why does a single shot often taste worse? We clarify doses, ratios, and the crucial difference in the cup. (Find fundamental brewing steps in our Espresso Brewing Guide.)
What a Double Espresso Is
A double espresso (Doppio) uses double the amount of ground coffee compared to a single espresso and delivers twice the yield in the cup. Here is an overview of standard values:
| Beverage | Coffee Dose (Input) | Espresso Yield (Output) | Volume (Guideline) |
|---|---|---|---|
| Single Espresso | 7–10 g | 14–20 g | approx. 20–25 ml |
| Double Espresso (Doppio) | 16–20 g | 32–40 g | approx. 40–50 ml |
At Kaffeemacher, we usually work with 18 g of coffee for a doppio. This is the dose most standard double portafilter baskets are designed for. In the cup, that yields 36 g at a 1:2 brew ratio, or 45 g at a 1:2.5 ratio, which we recommend for many coffees.
Grams, Milliliters, Volume — Why They Are Not the Same
A common misconception: 36 g of espresso is not 36 ml. Espresso includes crema, and crema has a significantly lower density than water. In practice, 36 g of espresso corresponds to roughly 40–50 ml in volume. The exact volume depends on how much crema your coffee generates.
That is why we always weigh espresso in grams rather than measuring in milliliters. A measuring glass is useless for precise espresso recipes. A scale accurate to 0.1 g is available affordably in our shop and immediately makes your espresso preparation repeatable. It is the single most sensible investment you can make for your setup.
Why a Doppio Almost Always Tastes Better
We generally recommend brewing a double espresso. Not because more coffee is automatically better, but for a fundamental physical reason.
A double basket is engineered for a specific coffee dose—its geometry, depth, and hole distribution at the bottom are tailored accordingly. When you put only 7–10 g into a single basket, it forms a shallow bed that creates far less resistance than intended. Minor density variations in the puck, which would be harmless in a doppio, instantly cause channeling in a single basket: water pushes coffee particles aside, and the resulting gap channels water through faster, widening the channel further. The result is an uneven extraction—over-extracted in some spots, under-extracted in others. The espresso tastes simultaneously sour and bitter—a classic channeling issue.
With 16–20 g of coffee in a double basket, the puck has the depth the basket was designed for. Water distributes evenly, and the puck resists small imperfections far better. Extraction becomes homogeneous, producing a cleaner taste. Many problems beginners encounter with single espressos disappear naturally when brewing doppios—simply because the equipment is being used as designed.
If you only want a small drink: brew a doppio anyway and drink half, or use the rest for a cappuccino. The cup quality is generally superior to a single basket shot. And usually, someone in your home or a neighbor will gladly take the second cup.
Secret Tip for Single Shots
A great compromise is using a 14–15 g double basket or a specialized single basket like our 58mm pro single basket. Our single basket holds up to 14 g of coffee. At a 1:2 ratio, you yield 28 g of espresso, turning a single-dose shot into a delicious extraction.
Even extraction even with smaller doses. Perfect for precise extractions with 58mm group heads.
Brew Ratio: The Number That Really Matters
The brew ratio describes how much ground coffee goes in versus how much espresso comes out. At a 1:2 ratio, 1 g of coffee yields 2 g of espresso liquid.
18 g coffee → 36 g espresso = 1:2. This is the baseline standard for most coffees. Lightly roasted specialty coffees often benefit from slightly more water (1:2.5), while dark roasts sometimes taste better with less (1:1.5 to 1:1.8).
To see where 1:2 sits globally, consider a field study by André Eiermann (2024): he measured 106 espresso shots across 85 cafes in 11 countries using a refractometer. Specialty coffee shops averaged 9.4% TDS (Total Dissolved Solids). A well-drawn doppio of 18 g in and 36 g out lands right in this sweet spot. Commercial cafes averaged 6.4% TDS, while super-automatics averaged 5.2%. The 1:2 ratio is no arbitrary number—it is the core parameter used by quality-focused espresso bars. (Note: traditional Southern Italian espresso operates well below this ratio, pulling significantly tighter shots.)
As for whether a doppio and a single shot taste identical at the same ratio: they are usually similar, but not necessarily identical. A thicker puck extracts in horizontal layers—the top coffee layers saturate earlier and extract differently than the bottom layers. If you switch between single and double baskets and notice a taste difference despite identical ratios, this layer dynamics is the reason.
Our recipes always state coffee dose, brew ratio, and target shot time. With these three metrics, you can adapt any recipe to your machine.
Shot Time: Single vs. Double Espresso
Does a double espresso need to run longer? Not necessarily. With double the coffee dose in a larger basket and double the water volume, resistance and flow scale proportionally in practice. Extraction time often remains in the same target window for identical ratios—typically 25–30 seconds.
If your doppio runs significantly faster or slower than a single shot at identical settings, grind size is almost always the culprit. Switching between single and double baskets requires adjusting grind size because puck depth changes resistance.
Our advice: stick to one basket size (preferably the double basket) and dial in your grind size for it. Constantly switching between single and double baskets makes dialing in unnecessarily complicated.
Caffeine: Is It Twice as Much?
Yes, roughly. A double espresso contains about twice as much caffeine as a single espresso because twice as much ground coffee is extracted. With an 18 g coffee dose, you end up with roughly 120–140 mg of caffeine depending on bean variety and roast degree (Arabica content and origin cause natural variations). A single shot with 9 g contains around 60–70 mg.
For comparison: a cup of filter coffee (200 ml) contains 80–120 mg of caffeine depending on brew method. A double espresso contains slightly more caffeine than a standard cup of drip coffee, despite looking much smaller in the cup.
Decaffeinated using the chemical-free Mountain Water Decaf process in Mexico. Chocolaty, sweet, and full-bodied—perfect for an evening espresso.
Ristretto, Lungo, and Espresso: Variations
Beyond the standard 1:2 ratio, two common variations are often confused with a doppio:
| Variation | Brew Ratio | Yield (for 18g Coffee) | Flavor Profile |
|---|---|---|---|
| Ristretto | 1:1 to 1:1.5 | 18–27 g | Shorter, more concentrated, higher acidity, less bitterness. |
| Espresso (Standard) | 1:2 to 1:2.5 | 36–45 g | Balanced between sweetness, acidity, and bitterness. |
| Lungo | 1:3 to 1:4 | 54–72 g | Thinner, higher volume, often more bitter due to extended extraction. |
A ristretto is not "stronger coffee," but rather a different balance of flavor compounds. If you drink a tiny, intense shot in a traditional Southern Italian bar, you are in this territory—pulled short with a concentrated profile.
The coffee dose stays identical across all variations. The only variable changing is liquid volume—and consequently shot time and taste. If an espresso tastes too sour, increasing water yield slightly (towards 1:2.5) can help. If it tastes too bitter, cut it slightly shorter (towards 1:1.8).
The most popular coffee drink in Switzerland is not a lungo—even if served in a similarly sized cup. The difference lies in the recipe: Café Crème is brewed with 12–15 g of coffee in a double basket at a 1:8 to 1:10 ratio, using a much coarser grind than espresso. From 15 g of coffee, you yield 120–150 g in 25–30 seconds.
If you brew a Café Crème as a lungo—using an espresso grind with more water—you end up with an over-extracted, bitter cup. A great Café Crème requires its own dedicated grind setting, ideally on a second grinder. Everything about its history, recipes, and coffee cream is explained in our detailed Café Crème article.
