How Much Caffeine Is in Coffee?

Caffeine is the reason many of us drink coffee in the first place, but the amount in your cup varies more than most people realize. A “cup of coffee” can mean anything from a small drip coffee with 80 mg to a large cold brew with well over 200 mg. Here’s how to estimate what you’re actually drinking.

Caffeine in coffee by drink

These are typical averages. Individual drinks can land well above or below them depending on the beans, the recipe and who’s making it.

Drink	Typical serving	Approx. caffeine
Brewed (drip or pour-over) coffee	8 fl oz	95 mg
Espresso, single shot	1 fl oz	63 mg
Espresso, double shot	2 fl oz	125 mg
Americano (double shot + water)	12 fl oz	125 mg
Latte or cappuccino (double shot)	12 fl oz	125 mg
Cold brew (ready to drink)	12 fl oz	150+ mg, highly variable
Instant coffee	8 fl oz	60–65 mg
Decaf brewed coffee	8 fl oz	2–15 mg

The brewed coffee, espresso and instant figures are based on USDA averages. Milk drinks like lattes and cappuccinos get their caffeine entirely from the espresso, so the milk doesn’t matter: a small latte made with a double shot has the same caffeine as a large one made with a double shot.

For comparison, an 8 oz cup of black tea typically has around 47 mg and a 12 oz cola around 34 mg.

Caffeine by cup size

Brewed coffee scales with volume. Using the USDA average of about 95 mg per 8 oz, here’s what common sizes work out to. Treat these as estimates; stronger recipes and robusta-heavy blends run higher.

Cup size	Brewed coffee (approx.)	Typical range
8 fl oz (small cup)	95 mg	70–140 mg
12 fl oz	140 mg	105–210 mg
16 fl oz	190 mg	140–280 mg
20 fl oz	235 mg	175–350 mg

Coffee-shop drip is often brewed stronger than these averages: a large cup can reach 300–400 mg on its own, close to or at the FDA’s 400 mg daily figure before any tea, soda or chocolate.

Espresso vs. drip coffee

This is the most common caffeine mix-up. Espresso is more concentrated, but drip coffee usually delivers more caffeine per serving.

• Per ounce: espresso has about 63 mg per ounce, while drip has roughly 12 mg per ounce. Espresso is about five times more concentrated.
• Per drink: a single shot (about 63 mg) has less than an 8 oz mug of drip (about 95 mg). A double shot (about 125 mg) is roughly equal to a 10–12 oz mug.

The reason is dose. A single espresso uses roughly 7–9 g of coffee and a double 14–20 g, while a 12 oz mug of drip at a 1:16 ratio uses around 22–25 g. Espresso extracts efficiently, but you’re simply drinking less coffee. Our espresso guide covers doses in more detail.

Why caffeine varies from cup to cup

Several factors change how much caffeine ends up in your mug.

1. Coffee species. Robusta beans contain roughly twice the caffeine of arabica. More on that below.
2. How much coffee you use. This is the biggest lever at home. Brewing at 1:15 instead of 1:17 puts about 13% more coffee, and so more caffeine, in the same size cup. See the coffee to water ratio guide.
3. Brew method and time. Caffeine dissolves readily, so most methods extract a large share of it. Longer contact times and finer grinds tend to pull a bit more.
4. Serving size. Obvious, but easy to forget when “a coffee” can mean 8 oz or 20 oz.
5. Roast level. Has a small effect, and less than most people think.

Light vs. dark roast: the caffeine myth

You’ll hear both “dark roast has more caffeine because it’s stronger” and “light roast has more caffeine because roasting burns it off.” Neither is quite right.

Caffeine is quite stable during roasting, so a bean loses little of it. What changes is the bean itself: darker roasts lose more water and mass and puff up more, so they’re lighter and less dense.

• Measured by weight (e.g. 20 g of each): the caffeine is very similar. If anything, dark roast can come out marginally higher because it has lost more non-caffeine mass.
• Measured by scoop: light roast usually has slightly more, because a scoop of dense light-roast beans weighs more than a scoop of puffy dark-roast beans.

Either way, the difference is small compared with bean species and how much coffee you use. The bold, bitter taste of dark roast comes from roasting, not caffeine. See light vs dark roast for how the two actually differ.

Arabica vs. Robusta caffeine

Species matters much more than roast. Commonly cited ranges, by weight of green coffee, are approximately:

Species	Approx. caffeine content	Where you’ll find it
Arabica (Coffea arabica)	about 1.2–1.5%	Most specialty coffee, pour-over beans, cafes
Robusta (Coffea canephora)	about 2.2–2.7%	Instant coffee, some espresso blends, budget blends

So a robusta-heavy cup can easily contain nearly double the caffeine of an all-arabica cup brewed the same way. Products marketed as “extra strong” or “high caffeine” often rely on robusta. Our arabica vs robusta comparison explains the flavor trade-offs.

How much caffeine is in cold brew?

Cold brew is the hardest drink to pin down, because everything depends on the recipe.

• Cold brew is usually made as a concentrate at around 1:4 to 1:5 (or about 1:8 ready-to-drink), much stronger than hot coffee.
• That concentrate is then diluted, often 1:1 with water or milk, but some people drink it straight or dilute it much more.
• Cold water extracts caffeine more slowly than hot water, but the long 12–18 hour steep and high coffee dose usually more than make up for it.

The result: a 12 oz glass can land anywhere from roughly the same as hot coffee to well over 200 mg. Store-bought cold brew lists caffeine on some labels; check before you assume. If you make it at home, the cold brew calculator helps you control strength, and our cold brew guide explains dilution.

Daily caffeine limits

Here’s the established guidance, in plain terms.

• Healthy adults: The U.S. Food and Drug Administration (FDA) says up to 400 mg per day is an amount not generally associated with dangerous, negative effects. That’s roughly four 8 oz cups of brewed coffee.
• Pregnancy: The American College of Obstetricians and Gynecologists (ACOG) advises keeping caffeine under 200 mg per day. That’s about two small cups of brewed coffee, or less if your cups are large.
• Children and teens: Pediatric groups generally discourage caffeine for children. Ask a pediatrician about specifics.

These are general guidelines, not targets. Some people feel jittery, anxious or have trouble sleeping at far lower amounts, and caffeine can interact with certain medications. Caffeine’s effects can also last many hours; its half-life varies a lot from person to person, which is why a mid-afternoon coffee can still affect sleep.

Caffeine calculator

Add up your drinks to see an estimated daily total against the FDA and pregnancy guidelines. It uses typical averages, so treat the result as a ballpark figure.

Daily caffeine calculator

• Brewed coffee 8 fl oz · ~95 mg−
  2
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• Espresso shot 1 fl oz · ~63 mg−
  0
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• Cold brew 12 fl oz · ~155 mg−
  0
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• Instant coffee 8 fl oz · ~62 mg−
  0
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• Decaf coffee 8 fl oz · ~2 mg−
  0
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• Black tea 8 fl oz · ~47 mg−
  0
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• Green tea 8 fl oz · ~28 mg−
  0
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• Cola 12 fl oz · ~34 mg−
  0
  +
• Energy drink 8.4 fl oz · ~80 mg−
  0
  +

Body weight (optional)

lbkg

Pregnant or breastfeeding?Use the 200 mg/day guideline

Total caffeine

190 mg

48% of 400 mg guideline

Within the commonly cited 400 mg/day guideline for healthy adults.

Estimates only — caffeine varies a lot between beans, brew methods and brands. The FDA cites 400 mg/day as an amount not generally associated with negative effects for healthy adults; ACOG advises under 200 mg/day during pregnancy. Sensitivity varies. This is not medical advice; ask your doctor if you have health concerns.

Prefer a full-page version? Open the standalone caffeine calculator.

How much caffeine is in decaf?

Decaf coffee is reduced, not caffeine free. In the U.S., the commonly cited industry standard is that at least 97% of the caffeine is removed, and the FDA notes decaf typically contains about 2–15 mg per 8 oz cup.

That’s tiny for most people, but it adds up if you drink several cups a day or are very sensitive. If you need to avoid caffeine entirely for medical reasons, ask your doctor whether decaf is appropriate.

Common decaffeination methods include the Swiss Water Process (water and carbon filtration), CO2 processing and solvent-based methods. All happen to green coffee before roasting, and all leave a small amount of caffeine behind.

Ways to cut back without quitting

If you’re over your target, you don’t have to give up coffee.

1. Go smaller. Switching from a 16 oz to an 8 oz mug roughly halves your caffeine.
2. Brew a little weaker. Moving from 1:15 to 1:17 lowers caffeine per cup by about 12%.
3. Choose single shots. A single-shot latte instead of a double halves the caffeine.
4. Try half-caf. Mix regular and decaf beans 50/50 before grinding.
5. Stick with arabica. Avoid robusta-heavy blends if you want less caffeine per cup.
6. Set a cutoff time. Many people sleep better with no caffeine in the afternoon.

Next steps

• Control strength precisely with the coffee to water ratio guide.
• Understand what’s in your beans with arabica vs robusta and light vs dark roast.
• Making espresso drinks at home? Start with how to make espresso at home.
• Track your day with the caffeine calculator.