How Much Caffeine Is in Coffee? | Bean & Burr

The short answer, from the U.S. Food and Drug Administration: a typical 8-ounce cup of brewed coffee contains roughly 80 to 100 milligrams of caffeine. But that is an average, and the real number for your cup swings widely with the brew method, how much coffee you use, the bean, and the roast. This guide gives the ranges by drink — attributed to authoritative sources rather than guessed — and explains what actually moves the number.

One note before the figures: caffeine content is genuinely variable, and any single number you see quoted is a representative average, not a precise measurement of your cup. We cite the ranges published by the FDA and the USDA's FoodData Central below, and we flag where numbers are estimates rather than fixed values.

Caffeine by drink

Drink	Typical caffeine	Source / note
Brewed / drip coffee (8 oz)	~80-100 mg	FDA
Espresso (1 oz shot)	~63 mg	USDA FoodData Central
Double espresso (2 oz)	~125 mg	Roughly 2x a single shot
Cold brew	Varies widely with concentration	See note below
Decaf coffee (8 oz)	~2-15 mg (not zero)	FDA / USDA — decaf is not caffeine-free

Drip and brewed coffee

For everyday drip, pour-over, and French press coffee, the FDA's figure of about 80 to 100 mg per 8-ounce cup is the number to anchor on. Note that many people drink far more than 8 ounces at a time — a 16-ounce travel mug is two of those cups, so it can easily carry 160 to 200 mg. The brew method matters less here than the amount: a bigger cup with more coffee in it simply contains more caffeine.

Espresso

Per ounce, espresso is far more concentrated than drip, but a serving is much smaller. The USDA's FoodData Central lists a 1-ounce espresso at roughly 63 mg of caffeine, so a typical double shot lands around 125 mg. Because a shot is only an ounce or two, a single espresso often has less total caffeine than a big mug of drip coffee, even though it tastes far stronger — strength of flavor is not the same as caffeine content. Our how much caffeine is in espresso guide digs into this in detail, and coffee vs espresso covers why the two taste so different.

Cold brew

Cold brew is the hardest to pin to a number, and anyone quoting a precise figure is overstating their certainty. It is usually made as a strong concentrate with a high coffee-to-water ratio, so undiluted it can be very high in caffeine — but it is meant to be diluted with water or milk before drinking, which brings the concentration down. The practical takeaway: cold brew's caffeine depends almost entirely on how concentrated you brew it and how much you dilute it, so it ranges from similar to drip up to considerably higher. Our cold brew vs iced coffee guide covers the concentration question.

Decaf: not caffeine-free

Decaffeinated coffee still contains a small amount of caffeine — it is decaffeinated, not caffeine-free. The FDA notes that decaf is not entirely without caffeine, and USDA data puts a cup at only a few milligrams, commonly cited in the range of about 2 to 15 mg per 8-ounce cup depending on the process and the coffee. For nearly everyone that is negligible, but it is worth knowing if you are avoiding caffeine strictly.

What changes the number

Beyond the brew method, several factors move caffeine up or down:

Dose (coffee-to-water ratio). The biggest lever by far. More coffee per cup means more caffeine, full stop. Our coffee-to-water ratio guide covers it.
Bean species. Robusta beans contain roughly twice the caffeine of Arabica. Most specialty coffee is Arabica, but robusta is common in some blends and instant coffee — see Arabica vs robusta.
Roast level. A common myth says dark roast has more caffeine; another says light roast does. By weight the difference is small, but because dark-roast beans are less dense, scooping by volume versus weighing can shift how much coffee — and caffeine — you actually use.
Grind and brew time. Finer grinds and longer contact time extract more caffeine from the same dose.
Serving size. The simplest one. A bigger cup with more coffee in it has more caffeine.

How much is too much?

For context on the numbers above: the FDA cites that, for healthy adults, up to about 400 mg of caffeine a day — roughly four or five 8-ounce cups of coffee — is not generally associated with negative effects. Individual tolerance varies, and pregnant people and those with certain conditions are usually advised to consume less; the FDA recommends checking with a doctor. This guide is general information, not medical advice.

Controlling your caffeine at home

If you want to manage how much caffeine is in your cup, the good news is that the biggest levers are entirely in your control. Here is where to focus.

Dose is the master dial

Forget the hot-versus-cold and light-versus-dark debates for a moment: the single biggest determinant of caffeine in your cup is how much coffee you use relative to water, multiplied by how big the cup is. If you want less caffeine, use less coffee or drink a smaller cup; if you want more, do the reverse. Weighing your coffee with a scale makes this repeatable, and our ratio guide shows the numbers.

Bean choice moves it too

If you are chasing more caffeine, a blend containing robusta will carry noticeably more than a pure Arabica, since robusta has roughly double the caffeine. If you want less, stick to Arabica and consider a half-caf blend. The Arabica vs robusta guide explains the flavor trade-offs that come with each.

Don't confuse strength with caffeine

A common mistake is assuming a drink that tastes strong is high in caffeine. Espresso tastes intense but a single shot often has less total caffeine than a large mug of mild drip coffee. Cold brew tastes smooth but can be very high if brewed concentrated. Judge caffeine by dose and serving size, not by how bold the flavor is — that is the reliable way to manage it.

Questions

Frequently asked

How much caffeine is in a cup of coffee?

The FDA puts a typical 8-ounce cup of brewed coffee at roughly 80 to 100 milligrams of caffeine. That is an average — the real amount depends on how much coffee you use, the bean, the roast, and the serving size. A large 16-ounce mug can easily carry 160 to 200 mg because it simply contains more coffee.

Does espresso have more caffeine than drip coffee?

Per ounce, yes — but per serving, often no. USDA FoodData Central lists a 1-ounce espresso at about 63 mg, so a double shot is around 125 mg. Because a shot is small, a single espresso can have less total caffeine than a big mug of drip. See our espresso caffeine guide for the full comparison.

Does decaf coffee have any caffeine?

Yes, a small amount — decaf is decaffeinated, not caffeine-free. The FDA notes decaf still contains some caffeine, and USDA data puts a cup at only a few milligrams, commonly cited around 2 to 15 mg per 8-ounce cup depending on the process. For most people that is negligible, but it matters if you are avoiding caffeine strictly.

How much caffeine per day is safe?

The FDA cites that, for healthy adults, up to about 400 mg of caffeine a day — roughly four to five 8-ounce cups of coffee — is not generally associated with negative effects. Tolerance varies from person to person, and pregnant people or those with certain conditions are usually advised to have less. Check with a doctor if you are unsure; this is general information, not medical advice.

Keep reading

Receipts

Sources

We do not run a testing lab, and we do not pretend to. Where a measured number came from a manufacturer spec sheet or a published standard, we name it and link it. Where we could not verify something, we say so on the page rather than quietly leaving it out. Read our full method.