If you’re new to making espresso at home, one of the first and most important questions you’ll ask is how many grams of coffee for espresso. This single measurement is the foundation of a great shot, and getting it right makes all the difference.
It might seem simple, but the answer isn’t just one number. The perfect dose depends on your machine, your basket, the coffee beans, and the flavor you like. This guide will walk you through everything you need to know, from standard starting points to fine-tuning your own perfect recipe.
How Many Grams Of Coffee For Espresso
For a standard double shot of espresso, the most common and recommended starting point is 18 grams of coffee. This dose is used with a standard 58mm portafilter basket and will yield about 36 grams of liquid espresso in 25 to 30 seconds. This 1:2 ratio (coffee to liquid) is the classic benchmark.
However, single shots are less common now. If you are using a single basket, a dose of 8 to 10 grams is typical. It’s important to know that basket size is the real dictator of your dose. Always check your basket’s capacity first.
The Golden Rule: Basket Size Determines Dose
Your portafilter basket is designed to hold a specific amount of coffee. Using too little or too much will lead to poor extraction. Here’s how to find your basket’s ideal range:
- Check the Basket Wall: Many baskets have the capacity stamped or engraved on the side or bottom (e.g., “18g”, “20g”).
- The Coin Test: After dosing and leveling your coffee, place a coin (like a US dime or penny) on top. Lock the portafilter into the group head, then remove it. If the coin has left a deep imprint, your dose is too high. A light imprint or none at all is good.
- The Shower Screen Mark Test: Dose and tamp your coffee. Lock the portafilter in and then remove it immediately without brewing. If there is a perfect circle imprint from the shower screen, your dose is slightly too high. You want little to no imprint.
Standard Dose Starting Points
Use this table as a quick reference guide. Remember, these are starting points for dialing in.
Basket Type | Typical Dose Range | Expected Yield (Liquid)
Single Basket | 8g – 10g | 16g – 20g
Double Basket (Standard) | 16g – 20g | 32g – 40g
Triple Basket | 20g – 22g | 40g – 44g
Pressurized Basket | 12g – 18g (follow machine manual) | Varies
Why Dose Matters: Under and Over Filling
Getting the dose wrong directly impacts water flow and extraction.
- Dose Too Low: The coffee puck will be too thin. Water will rush through it too quickly, leading to a weak, sour, and under-extracted shot. The puck may also disintegrate.
- Dose Too High: The coffee puck is packed too tightly against the shower screen. This restricts water flow, causing very long extraction times, bitterness, and a burnt taste. You might also struggle to lock the portafilter in.
The Role of Coffee Beans: Dark vs. Light Roast
The type of coffee bean you use can influence your ideal dose. Darker roasts are less dense and take up more volume. Lighter roasts are more dense and take up less volume.
- For Dark Roasts: You might use a slightly lower weight (e.g., 17g instead of 18g) to achieve the same physical puck depth in your basket.
- For Light Roasts: You might use a slightly higher weight (e.g., 19g) because the denser beans pack tighter. This can help slow extraction and get more sweetness from a light roast.
Step-by-Step: How to Dose and Dial In Your Espresso
Follow these steps to find your perfect dose for any coffee.
- Weigh Your Empty Portafilter: Note the weight. Tare your scale to zero with the portafilter on it.
- Grind and Dose: Grind coffee directly into the portafilter until your scale reads your target dose (start with 18g for a double).
- Level and Tamp: Level the grounds with a finger or tool, then apply firm, even pressure with your tamper.
- Weigh Your Yield: Place your cup on the scale, tare to zero, and start your shot. Stop the shot when you reach your target yield (e.g., 36g for a 1:2 ratio).
- Time Your Shot: Your shot time should be between 25-30 seconds from when the first drop hits the cup.
- Taste and Adjust: If it’s sour and fast, your grind is too coarse or dose too low. If it’s bitter and slow, your grind is too fine or dose too high. Adjust only one variable at a time—usually grind size first.
Beyond the Basics: Yield and Ratios
Once you have a handle on dose, you can play with yield to change the flavor profile. This is where brewing ratios come in.
- Ristretto (1:1 to 1:1.5): A shorter, more concentrated shot. For 18g of coffee, yield 18g-27g of liquid. Often sweeter and more intense, with less bitterness.
- Normale (1:1.5 to 1:2.5): The standard range. For 18g coffee, yield 27g-45g liquid. This is the most common target.
- Lungo (1:2.5 to 1:3+): A longer shot. For 18g coffee, yield 45g+ liquid. Can highlight different notes but risks bitterness if over-extracted.
Essential Tools for Consistent Dosing
Guessing won’t work. You need a few key tools.
- Digital Scale (0.1g resolution): This is non-negotiable. It measures your input dose and your output yield accurately.
- Good Grinder: A consistent, burr grinder is essential. The grind size is the primary control for extraction time.
- WDT Tool: A small tool with needles to break up clumps in the grounds for even water distribution.
- Leveling Tool/Tamper: Ensures a flat, even puck before tamping. A calibrated tamper can help with consistent pressure.
Common Mistakes to Avoid
Even with the right tools, it’s easy to slip up. Watch for these errors.
- Not Weighing Every Shot: Volume (like using a scoop) is inconsistent because coffee density varies. Always weigh.
- Changing Multiple Variables: If your shot is off, only change the grind size OR the dose, not both at once. Otherwise you won’t know what fixed it.
- Ignoring Basket Capacity: Forcing 20g into an 18g basket will always cause problems. Match your dose to your equipment.
- Using Stale Coffee: Freshly roasted coffee (2-4 weeks old) is crucial. Stale coffee will not crema properly and taste flat, no matter the dose.
FAQ: Your Espresso Dose Questions Answered
How many grams of coffee for a single espresso shot?
A traditional single shot uses 7 to 9 grams of coffee. However, true single shots are rare in specialty coffee today. Most cafes and home brewers use a double basket and split the shot if a smaller drink is needed. It’s harder to get a balanced extraction from a single basket.
Can I use pre-ground coffee for espresso?
You can, but it’s not ideal. Pre-ground coffee is usually too coarse for proper espresso and will go stale very quickly after opening. You lose all ability to adjust the grind size, which is your main tool for dialing in. For even passable results, you must use espresso-specific pre-ground coffee and a pressurized portafilter basket.
How does grind size affect the dose?
Grind size and dose work together. A finer grind will slow the shot down, a coarser grind will speed it up. If you change your dose, you may need to adjust your grind slightly to compensate. For example, if you increase your dose, the puck is thicker, so you might need a slightly coarser grind to keep the shot time from becoming too long. Always adjust grind first, then tweak dose if needed.
Why does my espresso taste sour even with the right dose?
A sour shot usually means under-extraction. The water passed through the coffee too quickly. The most likely fix is to make your grind setting finer. Other causes could be water that is not hot enough, or the coffee roast itself is very light and naturally more acidic. Ensure your machine is fully heated up.
Do I need to adjust the dose for different coffee origins?
Yes, indirectly. Different origins and processing methods affect bean density and hardness. A dense, hard bean from a high altitude might need a slightly finer grind or a tiny increase in dose compared to a softer bean. Let taste and shot time be your guide rather than changing dose based on origin alone.
How important is the tamping pressure?
Tamping pressure is less critical than consistency. Whether you tamp with 15 pounds of pressure or 30, the key is to do it the same way every time. An uneven tamp is a bigger problem than the exact force used. Once water pressure hits the puck, it compresses it further anyway. Focus on a level, straight-down tamp.
Putting It All Into Practice
Finding the answer to “how many grams of coffee for espresso” is the beginning of your journey. Start with the standard 18g in, 36g out in 27 seconds. Taste it. Write down what you think. Then, try changing one thing. Make the next shot a ristretto by stopping at 27g. See how the flavor changes. Next, try a slightly coarser grind with your 18g dose to see if a faster shot tastes better.
The best dose is the one that produces the espresso you enjoy most in your cup. It requires patience and practice, but the reward is a consistently fantastic shot you made yourself. Keep your scale close, pay attention to the details, and don’t be afraid to experiment once you understand the basic rules.