If you’re making espresso at home, one of the most common questions is how many grams coffee in an espresso. A standard single espresso shot typically uses between 18 and 20 grams of finely-ground coffee. This is the starting point, but the perfect amount depends on your machine, your beans, and the taste you prefer.
Getting this dose right is the first step to a balanced, flavorful shot. Too little coffee, and your espresso will be weak and sour. Too much, and it can become bitter and over-extracted. Let’s break down everything you need to know to measure like a pro.
How Many Grams Coffee In An Espresso
The core answer is straightforward, but the details matter. For a modern single shot, you will usually use 18 to 20 grams of coffee. This yields about 30 to 40 grams of liquid espresso in your cup, a ratio often called a “double” in many coffee shops today.
Traditional measurements were different. A classic single shot used about 7 grams of coffee, and a double used 14 grams. However, the specialty coffee industry has largely shifted toward the bigger 18-20 gram dose as a standard for a double shot. This allows for more flavor extraction and a richer beverage.
The Golden Ratio: Coffee Dose To Liquid Yield
Thinking in grams of coffee alone isn’t enough. You must also consider how much liquid espresso you produce. This relationship is called the “brew ratio.”
For a balanced espresso, a good starting ratio is 1:2. This means for every gram of coffee grounds, you get two grams of liquid espresso.
- Example: If you use 18 grams of coffee in the portafilter, you should aim for 36 grams of liquid espresso in your cup.
- This ratio is a guideline. Lighter roasts often taste better with a 1:2.5 or even 1:3 ratio (more liquid), which highlights their complexity.
- Darker roasts can work well with a tighter 1:1.5 ratio (less liquid), which can control bitterness.
Factors That Influence Your Ideal Coffee Dose
Why isn’t there one fixed number? Several variables change the equation. You need to adjust your dose based on these factors.
Coffee Bean Roast Level
Lighter roasted beans are denser. You can often use a slightly higher dose, like 19 or 20 grams, because they resist extraction more. Darker roasts are less dense and more porous. They extract faster, so a dose of 17 or 18 grams might be better to avoid bitterness.
Grind Size And Consistency
Grind size is directly tied to dose. A finer grind creates more resistance to water. If your grind is too fine, you might need to lower your dose slightly to allow water to flow. A coarser grind might require a higher dose to create enough resistance. A quality burr grinder is essential for consistent results.
Your Espresso Machine’s Basket Size
The portafilter basket has a physical limit. Most modern machines come with a “double” basket rated for 18-22 grams. Never overfill it; the coffee puck should not touch the shower screen before brewing. Underfilling can also lead to messy extraction. Check your basket’s recommended capacity.
Step-By-Step Guide To Dialing In Your Dose
“Dialing in” is the process of finding the perfect dose, grind, and yield for your specific coffee. Follow these steps.
- Start with a Standard Dose: Begin with 18 grams of your chosen coffee.
- Grind and Tamp: Grind the beans finely, distribute the grounds evenly in the portafilter, and tamp with consistent pressure.
- Time Your Shot: Start your machine. Your goal is to extract 36 grams of liquid espresso in about 25-30 seconds.
- Taste and Adjust: If the shot is sour and fast (under 25 seconds), use a finer grind or a slightly higher dose. If it’s bitter and slow (over 35 seconds), use a coarser grind or a slightly lower dose.
- Record Your Recipe: Once it tastes good—balanced, sweet, and flavorful—write down the dose, yield, and time. This is your recipe for that coffee.
Equipment You Need For Precise Measurement
Guessing won’t work. You need these tools for accuracy.
- Digital Scale: This is non-negotible. You need a scale that measures to 0.1 grams. Use it to weigh your coffee dose and your liquid yield.
- Quality Burr Grinder: Blade grinders create uneven particles. A burr grinder gives you consistent size, which is critical for even extraction.
- Tamper: A tamper that fits your basket snugly ensures a level, compact coffee puck.
- Timer: Use the stopwatch on your phone or a dedicated timer to track extraction.
Common Mistakes And How To Avoid Them
Even with good equipment, small errors can ruin a shot. Watch out for these.
Inconsistent Dosing
Don’t just scoop from your bag. Always weigh your beans before grinding. The volume of coffee can change day-to-day due to humidity and roast degassing.
Ignoring The Yield
Focusing only on the input (dose) and not the output (yield) is a major mistake. Always weigh the espresso in your cup. Volume (like fluid ounces) is inaccurate because of crema.
Overfilling The Basket
If you see an imprint of the shower screen screw on your wet puck after brewing, your dose is too high. This causes channeling and uneven extraction. Reduce your dose by half a gram and try again.
Advanced Considerations: Beyond The Basics
Once you’ve mastered the standard dose, you can experiment.
Single Shot Vs. Double Shot Dosing
True single shots (7-9 grams) are rare but can be delicious. They require a finer grind and precise technique. Most home baristas and cafes default to the 18-20 gram “double” because it’s more forgiving and flavorful.
Pressure Profiling And Dose
Some advanced machines let you control water pressure during the shot. With pressure profiling, you might use a lower dose with a longer extraction time to highlight specific flavors. This is an expert-level technique.
Decaf And Blend-Specific Dosing
Decaffeinated coffee often extracts differently. You may need a slightly finer grind or a higher dose to achieve the same body. Similarly, single-origin beans versus blends can require small adjustments to the standard 18-20 gram starting point.
FAQ: Frequently Asked Questions
Here are clear answers to common related questions.
How many grams of coffee are in a double espresso?
In modern specialty coffee, a double espresso uses 18 to 20 grams of coffee to produce 36 to 40 grams of liquid. This is now considered the standard in most cafes.
How much caffeine is in a 20 gram espresso shot?
Caffeine content varies by bean, but a shot from 20 grams of coffee typically contains roughly 80-100 milligrams of caffeine. This is about the same as a standard 8oz cup of drip coffee.
Can I use pre-ground coffee for espresso?
You can, but it’s not ideal. Pre-ground coffee is often too coarse for proper espresso and will stale quickly. For best results, invest in a grinder and use fresh, whole beans. The difference in taste is significant.
Why does my espresso taste sour even with 18 grams?
A sour taste usually means under-extraction. Your dose might be okay, but your grind is likely too coarse, or your water is too cool. Try grinding finer first, and ensure your machine is properly heated.
How do I know if my portafilter basket is full?
The best test is the “nickel test.” After locking in the full portafilter, remove it without brewing. If the coffee puck has a slight imprint of the shower screen but no deep dent, your dose is correct. If it’s wet and messy, you likely used too much.
Mastering your espresso dose is a fundamental skill. Start with 18 grams and a 1:2 brew ratio, then let taste be your guide. With a good scale and some practice, you’ll consistently pull excellent shots that rival any coffee shop. Remember, the numbers are a starting point—your personal preference is the final goal.