An espresso machine brews a concentrated shot of coffee by forcing nearly boiling water through finely ground beans under high pressure. The National Coffee Association (NCA) explains that espresso is not a specific bean or roast, but a brewing method that produces a small, intense drink with a velvety golden-brown crema on top and a sweet, acidic body beneath. Home espresso machines bring this quick process into your kitchen, letting you pull shots in about 20 to 30 seconds.
What is espresso?
According to the NCA, espresso is a coffee drink named after the method used to brew it. The process uses high pressure to push nearly boiling water through finely ground coffee, creating a concentrated shot with two distinct layers: the crema, a velvety golden-brown foam, and the liquid body that carries sweetness and acidity. While many people associate espresso with a dark roast, the NCA notes that coffee specifically roasted for espresso will best bring out its characteristics, though a variety of roasts can work.
In terms of taste, espresso is denser and more concentrated than brewed coffees, so it has a stronger flavor. The NCA points to USDA nutrition data showing that a one-ounce shot of espresso typically contains 63 milligrams of caffeine, while an ounce of brewed coffee has 12 to 16 milligrams. However, because a standard eight-ounce cup of drip coffee is much larger, you are probably consuming more total caffeine from that cup than from a single shot of espresso.
What you need to make espresso at home
The NCA’s guide to making espresso lists a few essential tools beyond the machine itself. A grinder is optional but preferred, and the NCA strongly recommends a burr grinder over a blade grinder. Burr grinders crush beans between two surfaces, producing a more consistent grind that extracts flavor evenly and is less likely to overheat the grounds. A blade grinder, which works like a food processor, can be harder to control and may give uneven results. If you are shopping for a grinder, the KitchenAid burr grinder chart shows that its model offers 70 unique grind size settings, with the finest setting intended for espresso. You can learn more about the differences in our coffee grinders section.
A tamper is needed to pack the grounds into a compact puck inside the portafilter, which helps the water saturate the coffee evenly. The NCA also suggests using a digital scale to weigh your dose and the brewed espresso, which makes it easier to repeat good results and adjust when something is off. Browse scales designed for coffee brewing.
Espresso machines come in several types, and the NCA breaks them down by how much control they give you. Manual machines put you fully in charge of brew time, water flow, and pressure, allowing a highly customized shot but requiring more effort. Semi-automatic machines create the pressure for you while you decide how much water to use; you need to watch the shot and stop it at your preferred time. Automatic machines control both pressure and water volume, so you are not tied to the machine during brewing, and some have built-in grinders or timers. Super-automatic machines handle everything from grinding to brewing at the press of a button, but they require a significant financial investment and offer little customization. The NCA recommends considering your comfort level, desired involvement, budget, kitchen space, capacity needs, safety features like automatic shut-off, noise, and cleaning requirements when choosing a machine. For a broader look at outfitting your kitchen, see our home coffee equipment guide.
Water quality matters too. The NCA advises using cold water, filtered if possible, and avoiding distilled or softened water. While the NCA does not specify an exact brewing temperature for espresso, it describes the water as nearly boiling. For other methods like pour-over and French press, the NCA cites the Specialty Coffee Association’s recommendation of 93 degrees Celsius plus or minus 3 degrees (about 195 to 205 degrees Fahrenheit).
The espresso brewing workflow
The NCA provides a step-by-step guide that works as a foundation, though the exact steps depend on your machine’s level of automation. The key numbers to remember are a coffee-to-water ratio of 1:2 (one gram of dry coffee to two grams of brewed espresso) and a brewing time of 20 to 30 seconds of contact between water and coffee. For grind size, the NCA says to start with a fine grind, similar to what you would use for espresso, and then adjust. If the shot tastes bitter or sour, the grind may be too fine, causing over-extraction; try a coarser setting. If it tastes flat or watery, the grind may be too coarse, causing under-extraction; try a finer setting. You can find more on dialing in your recipe in our brewing ratios guide.
Here is the general workflow described by the NCA:
- Warm your cup so it does not cool the freshly brewed espresso.
- Dose your ground coffee into the portafilter, the handled basket that holds the grounds and has a spout for the finished shot.
- Distribute the grounds evenly in the basket, then use a tamper to press them into a compact puck.
- Clear the group head (where the portafilter attaches) by running the machine briefly, which releases a quick burst of steam.
- Insert the portafilter into the group head and start brewing immediately to avoid burning the top of the puck.
- Stop the machine after 20 to 30 seconds if it is not automatic; otherwise, the machine will stop on its own.
The NCA emphasizes that safety should always be a priority. Hot liquids and equipment can cause burns, and grinder blades are sharp. Always follow the instructions that come with your machine and tools.
Daily cleaning and maintenance
After each use, the NCA says to clean your equipment following the specific instructions for your machine. In general, you should remove the portafilter, discard the used coffee puck, and clean, rinse, and dry the portafilter handle. Rinse and brush the group head to remove any residue. The NCA notes that machines with more features may require more maintenance, so factor that into your decision. For all equipment, stick to the manufacturer’s care guidelines to keep everything in good working order.
A stovetop alternative: the Moka pot
If you are not ready for an espresso machine, a Moka pot offers a way to make a rich, concentrated coffee on the stovetop. Bialetti, the company behind the original Moka Express, describes it as producing an authentic Italian-style espresso in minutes. Bialetti says the pot is made of food-grade aluminium.
Bialetti’s instructions are straightforward: fill the base with water to just below the safety valve, loosely fill the funnel with a medium-fine grind (gritty, not powdery), screw the top section on firmly, and place the pot on low to medium heat. Brewing takes about three to six minutes, depending on the size of the pot and the heat intensity. Remove it from the heat as soon as the pot is full to avoid a burnt taste. The Moka Express is not dishwasher safe and should be hand washed. It works on gas, electric, and ceramic hobs but not induction, unless you use a separate induction converter plate. For more on this method, visit our Moka pot page.
Frequently asked questions
Is espresso stronger than regular coffee?
In terms of flavor, yes: the NCA says espresso is denser and more concentrated, so it tastes stronger. For caffeine, a one-ounce shot of espresso has about 63 milligrams, while an ounce of brewed coffee has 12 to 16 milligrams, according to USDA data cited by the NCA. However, because a typical cup of drip coffee is eight ounces or more, you likely get more total caffeine from that cup than from a single espresso shot.
What grind size should I use for espresso?
The NCA recommends starting with a fine grind. KitchenAid’s burr grinder chart lists the finest setting as the one intended for espresso. If your shot tastes bitter or sour, try a slightly coarser grind; if it tastes flat or watery, go a little finer.
How do I clean my espresso machine?
The NCA advises cleaning your equipment after each use. Remove the portafilter, throw away the used coffee puck, and wash, rinse, and dry the portafilter handle. Rinse and brush the group head. Always follow the cleaning and maintenance instructions provided by your machine’s manufacturer.
For more guidance on choosing a home espresso machine, visit our Espresso Machines category page, or explore the full range of coffee equipment to round out your setup.
