A single shot of espresso contains roughly 45 to 75 mg of caffeine. A double shot, which is what most coffee shops pull by default, delivers 70 to 120 mg. The exact number depends on the beans, the grind, and how the shot is pulled.
Single vs. Double Shot
A standard single espresso is about 1 ounce (30 ml) of liquid. That small volume packs around 40 mg of caffeine per ounce, making espresso far more concentrated than drip coffee, which averages about 10 mg per ounce. A double shot doubles the volume to 2 ounces (60 ml) and lands in the 70 to 120 mg range. Most cafes in the U.S. default to a double shot when you order a latte, cappuccino, or flat white, so that 70 to 120 mg range is probably the number most relevant to your daily habit.
Why the Range Is So Wide
The biggest single factor is the type of coffee bean. Robusta beans contain about 2.2 to 2.7% caffeine by weight, while Arabica beans sit at 1.2 to 1.5%. That means a shot pulled with Robusta beans can deliver nearly twice the caffeine of an Arabica shot. Most specialty coffee shops use 100% Arabica, but many traditional Italian espresso blends include some Robusta for body and crema. If your espresso tastes noticeably bitter and punchy, there’s a good chance Robusta is in the mix, and your caffeine intake is on the higher end.
Roast level matters less than most people think. Dark roasts lose a small amount of caffeine during the roasting process compared to light roasts, but recent studies suggest the difference is negligible. The catch is that dark roast beans puff up and expand with heat, so if you’re scooping beans by volume rather than weighing them, a scoop of dark roast contains fewer beans and therefore slightly less caffeine. Measured by weight, the two roasts are nearly identical.
How Extraction Changes Your Caffeine
Caffeine dissolves quickly in hot water. At brewing temperatures between 195 and 205°F, most of the available caffeine is extracted within the standard 25 to 35 second espresso pull. Extending a shot to 45 or 50 seconds adds mostly bitterness, not much extra caffeine. Caffeine extraction follows a curve that rises sharply at first and then plateaus, so a longer pull hits diminishing returns fast.
This is also why espresso variations differ. A ristretto, which uses the same amount of coffee but stops at just 15 to 20 ml (about half an ounce), extracts slightly less total caffeine because less water passes through the grounds. A lungo pushes about 60 ml (2 oz) through the same dose and extracts a bit more, though the difference is smaller than you might expect given that the early seconds of brewing do most of the work.
Espresso vs. Drip Coffee
Ounce for ounce, espresso is about four times as concentrated as drip coffee. But nobody drinks 8 ounces of espresso. A typical 12-ounce cup of drip coffee contains roughly 120 mg of caffeine, which is comparable to a double espresso. So if you’re switching from drip to espresso-based drinks, your total caffeine intake probably stays about the same, assuming one double shot per drink. Order a large latte with three or four shots, though, and you’re looking at 200 to 300 mg in a single cup.
Caffeine in Capsule Espresso
If you brew espresso at home with a pod machine, the caffeine content is more predictable because the dose is pre-measured. Starbucks Nespresso capsules, for example, range from about 55 mg (Sumatra) to 75 mg (House Blend) per pod. Blonde and medium roasts tend to land in the mid-60s. Decaf espresso capsules contain around 3 mg, which is not zero but close enough for most people.
How Many Shots You Can Safely Drink
The FDA considers 400 mg of caffeine per day a safe limit for most healthy adults. A 2017 systematic review confirmed that threshold. At 63 mg per single shot (a rough midpoint), that works out to about six single shots or three double shots spread across a day. Spacing your intake helps, too. Caffeine’s half-life is about five hours, so a double espresso at 8 a.m. is largely cleared by early afternoon. Stacking multiple shots late in the day is more likely to cause jitteriness or disrupt sleep than spreading the same total amount across your morning.