If you’re making espresso at home or ordering at a cafe, you might wonder how many grams of espresso in a double shot. A double shot of espresso requires a specific mass of coffee to balance strength and flavor. This guide explains the standard weight, why it matters, and how to get it right every time.
We’ll cover the official standards, practical tips for home baristas, and how to adjust the recipe to suit your taste. Understanding this fundamental measurement is key to brewing excellent espresso.
How Many Grams Of Espresso In A Double Shot
The most common answer is that a double shot of espresso uses 18 to 20 grams of ground coffee. This yields approximately 36 to 40 grams of liquid espresso in the cup. This 1:2 ratio of coffee to beverage is the modern standard for a balanced double shot.
However, this is not a universal rule. The exact grams can vary based on the coffee’s roast, origin, your machine, and personal preference. Some recipes call for as little as 16 grams or as much as 22 grams for a double. The key is consistency once you find a recipe that works.
Historically, a “double” simply meant using two single-shot baskets. Since a single often used 7-9 grams, a double used 14-18 grams. Today, the dedicated double basket and higher doses are the norm for better extraction and flavor.
The Golden Ratio For Espresso Extraction
Modern espresso focuses on the brew ratio. This is the relationship between the dry coffee dose (input) and the final liquid espresso yield (output). For a double shot, the typical starting point is a 1:2 ratio.
This means for every gram of coffee, you extract two grams of espresso. An 18-gram dose aims for a 36-gram yield. This ratio helps achieve a balanced extraction, capturing sweetness while avoiding bitterness.
Here is a simple reference table for common double-shot ratios:
- Ristretto (shorter): 18g dose to 18-27g yield (1:1 to 1:1.5 ratio). More intense and syrupy.
- Normale (standard): 18g dose to 36g yield (1:2 ratio). Balanced and full-bodied.
- Lungo (longer): 18g dose to 45-54g yield (1:2.5 to 1:3 ratio). Lighter and more diluted.
Why Coffee Dose Weight Matters More Than Volume
You must measure by weight, not volume. A tablespoon of dark roast coffee weighs less than a tablespoon of light roast due to density differences. Using a scale ensures accuracy.
Inconsistent dosing leads to unpredictable results. Too little coffee causes a fast, weak, and sour shot. Too much coffee can cause over-extraction or even prevent the portafilter from locking in, leading to messy spills.
A good digital scale that measures to 0.1 grams is your most important tool. It allows you to replicate successful shots and make precise adjustments.
Equipment You Need For Precise Measurement
- A 0.1g resolution digital scale (fits under your cup).
- A quality burr grinder for consistent particle size.
- A calibrated tamper for even compression.
- A timer to track extraction duration.
Step By Step Guide To Dosing A Perfect Double Shot
Follow these steps to measure and pull a consistent double shot of espresso.
- Turn on your espresso machine and grinder. Let the machine heat up fully.
- Place your empty portafilter on the scale and tare it to zero.
- Grind coffee directly into the portafilter until you reach your target dose (e.g., 18.0g).
- Distribute the grounds evenly in the basket using your fingers or a tool.
- Tamp firmly and evenly with consistent pressure to create a level “puck.”
- Place your scale and cup under the portafilter. Tare the scale again.
- Start the extraction and timer simultaneously. Aim for your target yield (e.g., 36g).
- Stop the shot when the scale reads your target yield. The time should be 25-30 seconds.
- Record your dose, yield, and time. Taste the espresso and adjust if needed.
Factors That Influence The Ideal Grams For A Double Shot
Several variables affect wether you should use 17, 19, or 21 grams. Understanding these helps you dial in your espresso.
Coffee Bean Roast Profile And Origin
Dark roast beans are less dense and more porous. They often extract faster, so you might use a slightly lower dose (e.g., 17g) or a finer grind to slow the flow.
Light roast beans are denser and harder to extract. A higher dose (e.g., 19-20g) or a slightly coarser grind can help achieve a balanced extraction without excessive sourness.
Bean origin also plays a role. Some regions produce beans that naturally work better with specific ratios. Experimentation is key.
Espresso Machine And Grinder Quality
Higher-end machines with stable temperature and pressure (like 9 bars) provide more consistency, making it easier to stick to a standard dose.
Your grinder is arguably more important. A quality burr grinder produces uniform particles. Inconsistent grind from a cheap blade grinder will make hitting the right grams feel impossible, as channeling and uneven extraction will occur.
Portafilter Basket Size And Shape
The basket that holds the coffee has a maximum capacity. Most “double” baskets are rated for 18-22 grams. Never overfill it; the coffee puck should have a small gap (about 2mm) from the shower screen after tamping.
Using a basket too large for your dose leads to a wet, soupy puck and poor extraction. Using a basket too small means you can’t lock the portafilter in. Match your dose to your basket’s rated capacity.
How To Adjust Your Double Shot Recipe
If your shot doesn’t taste right, use this framework to adjust the grams and other variables.
Diagnosing Sour And Bitter Espresso
A sour, sharp shot is usually under-extracted. Not enough flavor has been pulled from the coffee. A bitter, harsh shot is usually over-extracted. Too many undesirable compounds have been dissolved.
To fix a sour shot, you can:
- Increase the yield (e.g., go from 36g to 38g) to extract more.
- Grind finer to slow the extraction and increase contact time.
- Slightly increase the dose, like adding 0.5 grams.
To fix a bitter shot, you can:
- Decrease the yield (e.g., go from 36g to 34g) to extract less.
- Grind coarser to speed up the extraction.
- Slightly decrease the dose.
The Role Of Grind Size, Temperature, And Pressure
Grind size is your primary adjustment tool. Think of dose as the coarse adjustment and grind as the fine adjustment. Only change one variable at a time.
Water temperature affects extraction. Cooler water (90-93°C/194-199°F) can highlight acidity in light roasts. Hotter water (93-96°C/199-205°F) can better extract sweetness from dark roasts.
Pressure is typically set at 9 bars, but some machines allow profiling. As a home barista, focus on dose, yield, and grind first before experimenting with advanced variables.
Common Mistakes When Measuring Espresso
Avoid these errors to improve your consistency immediately.
Relying On The Grinder’s Timer Instead Of A Scale
Grinder timers are not precise because bean density changes. Always use a scale to weigh the output directly in the portafilter. This guarantees you start with the correct grams every time.
Inconsistent Tamping Pressure
While exact tamping pressure isn’t as critical as consistency, wild variations cause problems. Aim for a firm, level tamp around 15-20 kg of pressure. An uneven tamp leads to channeling, where water finds a weak path through the puck, ruining the shot.
Not Accounting For Coffee Freshness
Freshly roasted coffee (1-3 weeks post-roast) releases CO2. It may require a slightly coarser grind or a slightly lower dose initially. As coffee ages, it becomes less porous and may need a finer grind or higher dose to maintain extraction time. The bean’s weight doesn’t change, but its behavior does.
FAQ: How Many Grams Of Espresso In A Double Shot
Here are answers to common related questions.
Is A Double Shot Exactly Two Single Shots?
Not usually. A single shot traditionally uses 7-9 grams for a 14-18 gram yield. A modern double is not simply two singles brewed together. It uses a larger basket and a single, larger coffee puck (18-20g), which extracts more evenly than two separate pucks would.
How Many Grams Of Caffeine Are In A Double Shot?
Caffeine content is measured in milligrams (mg), not grams. A typical double shot (using 18g of coffee) contains roughly 80-100 mg of caffeine per 30g of liquid, but this varies widely by bean type and roast. Robusta beans have nearly double the caffeine of Arabica beans.
How Many Ounces Is A Double Shot Of Espresso?
Since 1 ounce is about 28.35 grams, a standard 36-gram double shot is approximately 1.25 to 1.4 fluid ounces. This is a small volume, which is why espresso is so concentrated. A “lungo” or long shot might reach 2 ounces.
Should I Change The Dose For Different Drink Sizes?
For milk-based drinks like lattes, some baristas use a slightly higher dose (e.g., 20g) to ensure the coffee flavor cuts through the milk. For straight espresso, the standard 1:2 ratio is common. Experiment to see what you prefer in your drink.
What Is The Best Scale For Measuring Espresso?
Look for a scale with 0.1g precision, a fast refresh rate, a slim design to fit under your cup and portafilter, and water resistance. Popular models include the Acaia Lunar or more affordable options from Timemore or Hario. Any accurate kitchen scale can work to start.
Mastering the grams for your double shot is the foundation of great espresso. Start with 18 grams in and 36 grams out over 25-30 seconds. Use a scale, record your results, and adjust based on taste. The perfect double shot is the one you enjoy the most, so use these guidelines as a starting point for your own exploration.