How Many Grams Of Coffee For One Espresso Shot?

Quick answer

• A standard single espresso shot uses around 7-10 grams of coffee.
• For a double shot, aim for 14-20 grams.
• This is a starting point; adjust based on your grinder and taste.
• Always weigh your coffee for consistency.
• Freshly roasted beans are key.
• Dialing in your shot is an art, not just a science.

Who this is for

• Home baristas looking to nail their espresso game.
• Anyone who’s tired of inconsistent espresso shots.
• People who want to understand the basics of espresso dosing.

What to check first

Brewer type and filter type

You’re likely using an espresso machine here, so that’s a given. The crucial part is the portafilter basket. Single baskets are usually smaller and designed for less coffee. Double baskets are more common and designed for the 14-20 gram range. Make sure your basket matches the shot size you’re aiming for. Trying to stuff too much coffee into a small basket is a recipe for disaster.

Water quality and temperature

Espresso is mostly water, so good water makes good espresso. Use filtered water. Tap water can have minerals that build up in your machine (bad!) and affect taste. Temperature is also critical. Most machines aim for around 195-205°F. If your machine is too cold, you’ll get sour, under-extracted coffee. Too hot, and it’ll taste bitter and burnt. Check your machine’s manual for recommended temperatures.

Grind size and coffee freshness

This is huge. Espresso requires a very fine grind, like powdered sugar or finer. Too coarse, and water rushes through, giving you a weak, sour shot. Too fine, and it chokes the machine, leading to a bitter, burnt taste. Coffee freshness matters too. Aim for beans roasted within the last 1-4 weeks. Old beans lose their volatile aromatics, resulting in a flat, lifeless shot.

Coffee-to-water ratio

For espresso, the general ratio is 1:2 (coffee to liquid espresso). So, if you use 18 grams of coffee, you’re aiming for about 36 grams of liquid espresso. This is often called the “yield.” This ratio can shift based on taste, but it’s a solid starting point.

Cleanliness/descale status

A dirty machine is a bitter machine. Coffee oils build up, making your espresso taste stale and acrid. Regularly backflush your machine with water and a cleaning solution. Descaling removes mineral buildup. If you haven’t descaled in a while, or if your machine is acting up, this is likely the culprit. Check your manual for descaling procedures.

Step-by-step (brew workflow)

1. Weigh your beans.

• What to do: Use a digital scale to measure your whole beans. For a single, start with 7-10 grams. For a double, 14-20 grams.
• What “good” looks like: A precise number on your scale. Consistency is king.
• Common mistake: Guessing. This leads to wildly inconsistent shots. Avoid it by using a scale every time.

2. Grind your coffee.

• What to do: Grind the weighed beans to an espresso-fine consistency.
• What “good” looks like: A fluffy mound of grounds that looks like fine sand or powdered sugar.
• Common mistake: Grinding too coarse or too fine. This ruins the shot. Dial in your grinder before you need that morning shot.

3. Dose into portafilter.

• What to do: Transfer the ground coffee into your portafilter basket.
• What “good” looks like: Even distribution of grounds, no clumps.
• Common mistake: Leaving clumps or uneven distribution. This causes “channeling,” where water finds easy paths. Tap the portafilter gently to settle.

4. Distribute the grounds.

• What to do: Use a distribution tool or your finger to level the grounds evenly in the basket.
• What “good” looks like: A flat, even bed of coffee. No peaks or valleys.
• Common mistake: Not distributing. This is a major cause of channeling. A WDT (Weiss Distribution Technique) tool is a game-changer here.

5. Tamp the coffee.

• What to do: Apply firm, even pressure with a tamper to compress the grounds.
• What “good” looks like: A smooth, level puck of coffee. Consistent pressure is more important than brute force.
• Common mistake: Tamping unevenly or with too little pressure. This leads to channeling and inconsistent extraction. Aim for a level tamp.

6. Clean the portafilter rim.

• What to do: Wipe away any stray grounds from the rim of the portafilter.
• What “good” looks like: A clean rim.
• Common mistake: Leaving grounds on the rim. This can interfere with the seal in the group head, causing leaks.

7. Flush the group head.

• What to do: Run a short burst of hot water through the group head before locking in the portafilter.
• What “good” looks like: Clear water runs out.
• Common mistake: Not flushing. This can introduce stale water or grounds into your shot and cool down the group head.

8. Lock in the portafilter.

• What to do: Securely lock the portafilter into the espresso machine’s group head.
• What “good” looks like: A snug fit.
• Common mistake: Not locking it in fully. This can lead to a messy situation.

9. Start the brew.

• What to do: Immediately start the brew cycle.
• What “good” looks like: A steady stream of espresso begins to flow.
• Common mistake: Delaying the brew. This allows the hot portafilter to cook the grounds, leading to bitterness.

10. Monitor the shot.

• What to do: Watch the espresso flow. It should start dark, turn to a caramel color, and then blond.
• What “good” looks like: A steady, syrupy flow that gradually lightens. Aim for your target yield (e.g., 36g liquid for 18g coffee) in 25-30 seconds.
• Common mistake: Letting it run too long. This results in over-extraction and bitter, watery coffee. Stop the shot when it starts to blond too much.

11. Stop the brew.

• What to do: Stop the brew cycle when you reach your target yield or time.
• What “good” looks like: You’ve hit your target weight/volume.
• Common mistake: Not stopping the shot. Over-extraction is the enemy of good espresso.

12. Serve and enjoy.

• What to do: Serve immediately.
• What “good” looks like: Delicious espresso.
• Common mistake: Letting it sit. Espresso is best consumed right away.

Common mistakes (and what happens if you ignore them)

Mistake	What it causes	Fix
Using stale coffee beans	Flat, dull taste, lack of crema	Use beans roasted within the last 1-4 weeks.
Incorrect grind size (too coarse)	Water rushes through, weak, sour shot	Grind finer.
Incorrect grind size (too fine)	Water chokes, bitter, burnt shot	Grind coarser.
Uneven distribution/tamping	Channeling, uneven extraction, bitter/sour spots	Use a distribution tool and tamp evenly.
Using old, dirty water	Off-flavors, scale buildup in machine	Use filtered water and descale regularly.
Not cleaning the machine	Stale, oily, bitter taste	Backflush regularly with water and cleaning solution.
Incorrect coffee-to-water ratio	Too strong or too weak, unbalanced flavor	Weigh your coffee and your liquid yield; aim for 1:2 as a start.
Over-extraction (running shot too long)	Bitter, burnt, watery flavor	Stop the shot when it starts to blond significantly.
Under-extraction (shot too fast)	Sour, weak, thin flavor	Grind finer or increase dose.
Using the wrong filter basket	Inconsistent dose, poor puck integrity	Use a basket sized for your intended dose (single/double).

Decision rules (simple if/then)

• If your espresso tastes sour, then grind finer because the water is passing through too quickly.
• If your espresso tastes bitter, then grind coarser because the water is struggling to pass through.
• If your espresso shot runs too fast (under 20 seconds), then grind finer because the grounds are too coarse.
• If your espresso shot runs too slow (over 35 seconds), then grind coarser because the grounds are too fine.
• If your espresso has no crema or very thin crema, then check your coffee freshness or grind size because old beans or a grind that’s too coarse won’t produce good crema.
• If your espresso tastes muddy, then your grind might be too fine, or your coffee is stale because these can lead to over-extraction.
• If you see spurts of water during the brew, then your puck has channeled, likely due to uneven distribution or tamping.
• If your machine is making strange noises or pressure seems low, then check your descaling status because mineral buildup can affect performance.
• If your espresso tastes like old coffee, then it’s time to clean your machine and portafilter because coffee oils go rancid.
• If you’re using a scale and hitting your target yield but it still tastes off, then try adjusting your dose slightly (e.g., +/- 0.5g) because dose can affect extraction.
• If your water temperature feels too hot (burnt taste) or too cold (sour taste), then check your machine’s settings or consult the manual because temperature is crucial.

FAQ

What’s the difference between a single and double espresso dose?

A single typically uses 7-10 grams of coffee, while a double uses 14-20 grams. The basket size in your portafilter dictates what’s practical.

How much liquid espresso should I get for 18 grams of coffee?

A good starting point is a 1:2 ratio, meaning you’d aim for about 36 grams of liquid espresso. This is called your yield.

My espresso machine is new, but my shots are bad. What gives?

Even new machines require dialing in. Focus on grind size, dose, and distribution first. Fresh, quality beans are non-negotiable.

How often should I clean my espresso machine?

Backflush with water daily if you use it often. Use a cleaning solution weekly or bi-weekly. Descale every 1-3 months depending on water hardness and usage.

Can I use pre-ground coffee for espresso?

You can, but it’s highly discouraged. Pre-ground coffee loses freshness rapidly, and espresso requires a very specific, fresh grind. It’s almost impossible to get good results.

What is “channeling” and how do I stop it?

Channeling is when water finds easy paths through the coffee puck, leading to uneven extraction. It’s usually caused by poor distribution or tamping. A WDT tool and consistent tamping help a lot.

Does the type of coffee bean matter for the dose?

Yes, to some extent. Lighter roasts might need a slightly finer grind or slightly higher dose to extract well, while darker roasts might need coarser grinds or lower doses. Always taste and adjust.

What’s the deal with crema?

Crema is the foamy, reddish-brown layer on top of espresso. It’s formed by emulsified oils and CO2 from the coffee. Good crema indicates fresh beans and proper extraction, but it’s not the only indicator of a good shot.

What this page does NOT cover (and where to go next)

• Specific machine calibration or repair.
• Advanced espresso techniques like latte art.
• Detailed discussions on water chemistry beyond basic filtration.
• In-depth reviews of specific coffee grinders or espresso machines.
• Troubleshooting electrical issues with your machine.