What is espresso? Espresso is a small, concentrated coffee made by forcing hot water, at about 9 bar of pressure, through a tightly packed bed of finely ground coffee in roughly 25–30 seconds. The result is a thick, intense shot of about 30–60 ml with a layer of golden-brown foam on top called crema. Espresso isn’t a type of bean or a roast: it’s a brewing method, and any coffee can be brewed as espresso.
This guide explains what an espresso shot is, what it tastes like, how it’s made, how much caffeine it has, and how it differs from regular coffee.
What is espresso? Definition and meaning
The word espresso is Italian. It’s usually linked to the idea of something “expressed” or “pressed out”, and also to “express”: made quickly, on the spot, for one person. Both fit: espresso is pressed out under pressure and made to order in under a minute.
A practical definition of espresso coffee has four parts:
- Finely ground coffee, much finer than for drip.
- High pressure, typically around 9 bar at the coffee bed (about nine times atmospheric pressure).
- Hot water, usually 90–96 °C (194–205 °F).
- A short brew time, about 20–35 seconds, producing a concentrated drink with crema.
You’ll sometimes see it misspelled “expresso”. The correct spelling in English and Italian is espresso.
Is espresso a type of bean or roast?
No. “Espresso roast” or “espresso blend” on a bag just means the roaster designed it to taste good as espresso, often a medium to dark roast. You can pull espresso from light roasts and brew “espresso beans” as drip coffee. See our guide to the best coffee beans for espresso for what to look for.
What is an espresso shot?
An espresso shot is one serving of espresso. Standard sizes:
| Shot | Dry coffee | Liquid out | Time |
|---|---|---|---|
| Single (solo) | 7–10 g | ~15–30 ml (about 1 oz) | 20–30 s |
| Double (doppio) | 16–20 g | ~30–60 ml (about 2 oz) | 25–30 s |
| Ristretto | Same as double | Less, ~1:1–1:1.5 ratio | 15–25 s |
| Lungo | Same as double | More, ~1:3 ratio | 30–45 s |
Most specialty cafés now serve a double as their default shot. Modern recipes measure espresso by weight rather than volume, because crema makes volume unreliable. A common starting recipe is 18 g of coffee in and 36 g of liquid espresso out, a 1:2 ratio. Our espresso brew ratio guide explains how changing that ratio changes the taste.
The Italian Espresso National Institute (INEI), which certifies “Espresso Italiano”, uses a more traditional single-shot definition: about 7 g of coffee producing around 25 ml in about 25 seconds.
What does espresso taste like?
A good espresso is intense but balanced. Expect:
- Body: thick, syrupy, almost creamy, because pressure emulsifies coffee oils and carries tiny particles into the cup.
- Sweetness: caramel, chocolate, brown sugar or ripe fruit, depending on the beans.
- Acidity: brightness ranging from mild (dark roasts) to fruity and lively (light roasts).
- Bitterness: a pleasant, dark-chocolate edge, not a harsh or burnt taste.
- Finish: a long aftertaste that lingers for minutes.
Poorly made espresso is the opposite: sour and thin when under-extracted, or harsh and drying when over-extracted.
What is crema?
Crema is the reddish-brown foam on top of a fresh shot. It forms when high pressure dissolves carbon dioxide (released by roasted coffee) into the liquid, which then comes out of solution as tiny bubbles bound with oils and proteins. Fresh beans make more crema. Crema looks great but isn’t a guarantee of flavor; it can taste bitter on its own, and some very good shots have little of it. Stir it in before drinking.
How espresso is made
The equipment
- Espresso machine: heats water and pushes it through the coffee at pressure. Types include manual lever, semi-automatic (you start and stop the shot), automatic and super-automatic (grinds and brews at the push of a button).
- Grinder: a burr grinder that can grind fine and adjust in small steps. Many people say the grinder matters as much as the machine. See our espresso grinder picks.
- Portafilter and basket: the handle and metal basket that hold the coffee.
- Tamper and scale: to compress the coffee evenly and measure dose and yield.
The process, step by step
- Grind about 18 g of fresh beans fine, just before brewing.
- Distribute and tamp the coffee into the basket to form an even, compact puck.
- Lock in and brew. Water at about 93 °C is pushed through the puck, often starting with a low-pressure pre-infusion before full pressure.
- Stop the shot at your target yield, around 36 g, in about 25–30 seconds.
- Taste and adjust. Grind finer if it’s sour and fast; coarser if it’s bitter and slow.
For a detailed walkthrough, read how to make espresso at home. Choosing a first machine is mostly about budget, milk-drink habits and how hands-on you want to be.
Can you make espresso without a machine?
Not true espresso, because you need around 9 bar of pressure. A moka pot (about 1–2 bar) makes a strong, espresso-style coffee, and an AeroPress can make a concentrated shot. Manual lever and portable hand-pump devices can reach espresso pressure without electricity.
A short history of espresso
Espresso developed in Italy at the turn of the 20th century. Angelo Moriondo of Turin patented an early steam-driven coffee machine in 1884. In the early 1900s, Luigi Bezzera and Desiderio Pavoni developed and commercialized machines that brewed single servings quickly, mostly using steam. Those early drinks were strong but had no crema.
The modern shot arrived after World War II, when Achille Gaggia popularized spring-piston lever machines that pushed water through coffee at much higher pressures. This produced the crema and syrupy texture we now associate with espresso. In 1961, the Faema E61 introduced an electric pump and a heat-exchange group design that remains influential in home and café machines today.
Espresso vs regular coffee
| Espresso | Drip / filter coffee | |
|---|---|---|
| Grind | Fine | Medium |
| Pressure | ~9 bar | Gravity only |
| Brew time | 25–30 seconds | 3–6 minutes |
| Ratio | ~1:2 | ~1:15–1:17 |
| Serving | 30–60 ml | 240–350 ml |
| Body | Thick, syrupy, with crema | Light to medium, clean |
| Caffeine per serving | About 63 mg per 1 oz shot | About 96 mg per 8 oz cup |
Espresso is much more concentrated per milliliter, but a typical serving of drip coffee contains more caffeine in total because it’s so much larger.
How much caffeine is in espresso?
According to Mayo Clinic, a 1 oz (30 ml) shot of espresso contains about 63 mg of caffeine, and decaf espresso about 1 mg. A double shot is roughly 125 mg. Real numbers vary widely with the beans (robusta has roughly twice the caffeine of arabica), the dose and the yield.
The FDA cites 400 mg a day as an amount not generally associated with negative effects for most adults, while noting that sensitivity varies and that people who are pregnant, trying to conceive or breastfeeding should ask their doctor. If you have questions about caffeine and your own health, ask your doctor.
Drinks made with espresso
Espresso is the base for most café drinks:
- With water: Americano, long black
- With a little milk: macchiato, cortado
- With more milk: flat white, cappuccino, latte
- Sweet: mocha, affogato
- Iced: iced latte, shaken espresso, espresso tonic
How to drink espresso
- Drink it fresh. Espresso changes quickly; crema fades and flavors flatten within a few minutes.
- Stir first. The top, middle and bottom of a shot taste different. A quick stir blends them.
- Sip with water. Italian cafés often serve a small glass of water to cleanse the palate before the shot.
- Sugar is optional. A little sugar is traditional in Italy and can balance acidity.
- Use a warm, small cup. A thick-walled 2–3 oz (60–90 ml) cup keeps the shot hot.
Types of espresso machines
| Type | How it works | Good for |
|---|---|---|
| Manual lever | You pull a lever to create pressure | Enthusiasts who want hands-on control |
| Semi-automatic | A pump creates pressure; you start and stop the shot | Most home baristas |
| Automatic | Like semi-automatic, but stops at a programmed volume | Consistency with less attention |
| Super-automatic | Grinds, tamps, brews and often froths milk at one touch | Convenience above all |
| Capsule | Brews pre-portioned pods under pressure | Speed and zero mess |
| Portable / hand-pump | You pump by hand to reach espresso pressure | Travel and camping |
Inside semi-automatic machines, the boiler design matters too. Single-boiler machines brew and steam from one boiler, so you wait between tasks. Heat-exchanger and dual-boiler machines let you brew and steam at the same time. Thermoblock and thermocoil machines heat water on demand and warm up very fast. For how two popular entry-level models compare, see our Bambino Plus vs Barista Express comparison.
How to tell if an espresso is good
- It looks right: the shot starts dark and syrupy, flows like warm honey and gradually lightens. Fresh crema is hazelnut to reddish brown and lasts a minute or two.
- It smells inviting: sweet, roasty or fruity, without burnt or sour notes.
- It tastes balanced: sweetness, acidity and bitterness all present, none overpowering. Sour and thin means under-extracted; harsh and drying means over-extracted.
- It has texture: thick and coating rather than watery.
- The finish is pleasant: a clean, lingering aftertaste.
Common espresso myths
- “Espresso is a dark roast.” Any roast can be espresso; many cafés now serve medium or light roasts.
- “More crema means better espresso.” Crema shows freshness and the presence of robusta or dark roast as much as quality. Taste is what matters.
- “Espresso has the most caffeine.” Per serving, a large cup of drip or cold brew usually has more.
- “You need 15 bar.” Many machines advertise 15 or 20 bar pump ratings, but about 9 bar at the coffee is the traditional target. Higher numbers on the box don’t mean better shots.
- “Tamp as hard as you can.” A firm, level tamp is enough; consistency matters more than force.
Choosing beans for espresso
Any beans can be brewed as espresso, but some are easier than others. Medium and medium-dark roasts with chocolate, caramel and nut notes are the most forgiving and taste great with milk. Light roasts can be wonderfully sweet and fruity as espresso but need a finer grind, hotter water and more patience to dial in. Freshness matters more than almost anything: look for a roast date, and use beans roughly 7–30 days after roasting for the most crema and flavor. Buy whole beans and grind just before brewing; pre-ground coffee loses aroma within hours and can’t be adjusted when a shot runs too fast or slow.
Espresso at home vs at a café
Café machines hold large volumes of water at very stable temperatures and use powerful grinders, which makes consistency easier. At home, the biggest gaps are usually the grinder and temperature stability rather than pressure. A modest machine paired with a good grinder, fresh beans and a scale can produce shots that rival many cafés. Expect a learning curve of a few bags of coffee while you get used to dialing in.
FAQ
Is espresso stronger than coffee?
It’s stronger per sip: more concentrated in flavor and caffeine per milliliter. But a typical 8 oz cup of drip coffee (about 96 mg) has more total caffeine than a single 1 oz shot of espresso (about 63 mg).
What’s the difference between espresso and coffee beans?
There’s no botanical difference. “Espresso beans” are regular coffee beans, usually roasted and blended to taste good as espresso. You can use any beans for espresso or for drip.
Why is espresso served in small cups?
Because a shot is only 30–60 ml. Small, thick cups keep it warm and concentrate the aroma.
How do you pronounce espresso?
“ess-PRESS-oh”. There’s no “x” in espresso.
Is espresso healthier than regular coffee?
Neither is clearly healthier. Espresso is unfiltered by paper, so it contains more coffee oils (cafestol and kahweol) than paper-filtered coffee, which may raise LDL cholesterol in some people, but servings are small. Ask your doctor if you have specific concerns.
Do you need a special machine to make espresso?
For true espresso, yes: you need about 9 bar of pressure from a pump, lever or manual press. A moka pot or AeroPress makes strong, espresso-style coffee without one.