How Much Caffeine Is in a Shot of Espresso?
A standard double shot of espresso contains roughly 60 to 80 mg of caffeine, with 63 mg being a commonly cited average. A single shot (about 7 to 8 grams of coffee) contains around 30 to 40 mg.
But that number varies more than most people realise. The actual caffeine content of your espresso depends on several factors:
- Bean variety: Robusta beans contain roughly twice the caffeine of Arabica (about 2.2% vs 1.2% by weight). Most specialty espresso uses 100% Arabica, but some Italian-style blends include Robusta for crema and body, which significantly increases caffeine.
- Dose: An 18g dose contains more caffeine than a 15g dose, all else being equal. If your double basket holds 20g, you are getting more caffeine per shot than someone dosing 16g.
- Extraction: Caffeine is highly water-soluble and extracts early in the shot. Longer extractions pull out slightly more caffeine, but the difference is modest. Most of the caffeine dissolves within the first 15 seconds.
- Bean origin and growing conditions: Beans grown at lower altitudes tend to have slightly higher caffeine content, as the plant produces caffeine partly as an insect deterrent and lower-altitude environments have more insect pressure.
Does Roast Level Affect Caffeine?
This is one of the most misunderstood topics in coffee. The short answer is: roast level makes very little practical difference to the caffeine in your cup, but the mechanism is worth understanding.
Caffeine is thermally stable and survives the roasting process largely intact. A green bean and a dark-roasted bean contain nearly the same total caffeine. What changes during roasting is the bean's mass and volume:
- Dark roasts lose more moisture and expand more. Each bean weighs less but takes up more space.
- Light roasts retain more moisture and are denser. Each bean weighs more but is smaller.
This means:
| Measurement Method | Higher Caffeine |
|---|---|
| By weight (grams) | Light roast (more beans per gram, so slightly more caffeine per gram) |
| By volume (scoops) | Dark roast (fewer beans per scoop, but each bean is larger and lighter, so you use more beans by count) |
In practice, for espresso, this barely matters. Home baristas weigh their dose in grams. If you dose 18g of light roast and 18g of dark roast, the light roast will contain marginally more caffeine because you are using slightly more beans to reach 18g. But the difference is typically only 5 to 10% and is far less significant than the difference between Arabica and Robusta, or between a 15g and 20g dose.
Do not choose your roast level based on caffeine content. The flavour difference is enormous; the caffeine difference is negligible.
Espresso vs Other Coffee Drinks
Espresso has a reputation for being extremely caffeinated, but that is misleading. Per millilitre, espresso is the most concentrated source of caffeine. Per serving, it contains far less than most brewed coffee.
| Drink | Typical Serving | Caffeine (approx.) |
|---|---|---|
| Single espresso | 30 ml | 30-40 mg |
| Double espresso | 60 ml | 60-80 mg |
| Filter coffee (drip) | 240 ml (8 oz) | 80-120 mg |
| French press | 240 ml (8 oz) | 90-110 mg |
| Cold brew | 240 ml (8 oz) | 100-200 mg |
| Americano (double shot) | 240 ml | 60-80 mg |
| Latte (double shot) | 360 ml (12 oz) | 60-80 mg |
An Americano or latte made with a double shot has the same caffeine as that double shot - adding water or milk does not add or remove caffeine. A large filter coffee from most cafes contains significantly more caffeine than a double espresso.
How Multiple Shots Add Up
This is where espresso drinkers need to pay attention. A single double shot is moderate, but many home baristas pull three, four or more doubles across the day:
| Doubles per day | Total caffeine (approx.) |
|---|---|
| 1 | 60-80 mg |
| 2 | 120-160 mg |
| 3 | 180-240 mg |
| 4 | 240-320 mg |
| 5 | 300-400 mg |
| 6 | 360-480 mg |
The FDA's general guideline is that up to 400 mg of caffeine per day is not associated with dangerous effects for most healthy adults. That is roughly five to six double shots of 100% Arabica espresso. Pregnant women are generally advised to stay under 200 mg.
Individual sensitivity varies enormously. Some people metabolise caffeine quickly and feel fine after four doubles. Others feel jittery after two. Factors like genetics, medication, body weight and habitual consumption all influence your personal tolerance.
Caffeine's half-life in your body is roughly 5 to 6 hours. A double shot at 3pm still has half its caffeine circulating at 8 or 9pm, which can affect sleep quality even if you do not feel wired.
Tracking Your Caffeine
Knowing how much caffeine you consume is useful for two reasons: staying within your comfortable range and understanding why some days feel different from others.
Puck Yeah includes a caffeine tracker that estimates your intake based on your logged shots and displays a caffeine curve throughout the day. It accounts for caffeine's half-life, so you can see your estimated caffeine level at any time, not just the cumulative total. The app flags when you cross 300 mg with a gentle warning.
If you are not tracking, a simple tally of your shots works. Multiply the number of doubles by 65 mg for a rough Arabica estimate. Add 30% if your blend includes Robusta.
Further Reading
- How to Dial In Espresso explains dose and yield, which directly affect caffeine per shot.
- Espresso Brew Ratios Explained covers how ratio choices interact with extraction and caffeine.
- Coffee Bean Origins and Processing discusses how origin affects bean composition including caffeine.
Key Takeaways
- A double espresso contains roughly 60 to 80 mg of caffeine, less than most cups of filter coffee
- Roast level makes only a small difference (5 to 10%) when dosing by weight
- Bean variety (Arabica vs Robusta) and dose size matter far more than roast level
- The FDA guideline is 400 mg per day for most adults, roughly five to six double shots
- Caffeine has a 5 to 6 hour half-life, so afternoon shots can affect sleep
- Tracking your daily intake helps you find your personal sweet spot