A standard 8-ounce cup of brewed coffee contains roughly 95 to 200 mg of caffeine. That wide range exists because caffeine levels shift depending on the bean type, roast, brewing method, and how much ground coffee goes into the cup. Here’s what to expect from different types of coffee and the factors that push caffeine up or down.
Caffeine by Brewing Method
Drip-brewed coffee, the kind most people make at home or grab from a diner, lands in that 95 to 200 mg range per 8-ounce cup. The variation comes mostly from how strong the brew is and what beans were used.
Espresso packs more caffeine per ounce but less per serving. A single shot (about 1 ounce) contains roughly 63 mg of caffeine. A double shot doubles that to around 126 mg. So even though espresso tastes more intense, a full mug of drip coffee typically delivers more total caffeine than an espresso-based drink.
Cold brew averages about 200 mg per 16-ounce serving. Because cold brew steeps for 12 to 24 hours, you might expect it to be a caffeine bomb, but it’s usually diluted before serving. The result is a caffeine level comparable to hot drip coffee ounce for ounce. Iced coffee, which is just hot-brewed coffee poured over ice, tends to come in a bit lower. A 16-ounce iced coffee at Starbucks has about 165 mg.
Instant coffee sits at the low end. A typical 8-ounce cup made from instant granules contains around 60 to 80 mg, roughly half of what you’d get from a fresh-brewed cup.
What You’ll Get at Major Chains
Coffee shop servings are larger than the standard 8-ounce cup, so the caffeine numbers climb fast. Data from the Center for Science in the Public Interest shows meaningful differences between chains and drink styles:
- Starbucks brewed coffee (16 oz grande): 315 to 390 mg
- Caribou Coffee (16 oz medium): 305 mg
- Dunkin’ brewed coffee (14 oz medium): 210 mg
- Starbucks Cold Brew (16 oz grande): 205 mg
- Starbucks Caffè Americano (16 oz grande): 225 mg
- Starbucks Caffè Mocha (16 oz grande): 175 mg
- Dunkin’ Latte or Cappuccino (14 oz medium): 166 mg
- Starbucks Caffè Latte or Cappuccino (16 oz grande): 150 mg
- Starbucks Coffee Frappuccino (16 oz grande): 95 mg
A single Starbucks grande brewed coffee can contain nearly as much caffeine as the FDA’s entire recommended daily limit. That’s worth noting if you’re a two-cup-a-day person. Milk-based drinks like lattes and cappuccinos contain less caffeine because they use one or two espresso shots diluted with steamed milk, rather than a full cup of brewed coffee.
Bean Type Matters More Than Roast
The two main coffee species, Arabica and Robusta, have very different caffeine levels. Arabica beans contain about 1.2 to 1.5% caffeine by weight. Robusta beans contain 2.2 to 2.7%, nearly double. Most specialty coffee shops use Arabica, while cheaper blends and instant coffees often include Robusta. If your instant coffee feels surprisingly strong, Robusta beans may be part of the reason.
Roast level, on the other hand, barely changes the caffeine content. A 2018 study found a sample of light roast brewed coffee contained about 60 mg of caffeine compared to 51 mg in the same amount of dark roast, a small difference that varies between batches anyway. The persistent myth that dark roasts are “stronger” in caffeine comes from their bolder flavor, not their chemistry. When coffee is measured by weight (as most cafés do), light and dark roasts deliver nearly identical caffeine.
One quirk: dark roast beans puff up during roasting, so they’re physically larger. If you scoop your coffee by volume at home rather than weighing it, you’ll fit fewer dark roast beans in each scoop. That means a tablespoon of dark roast grounds contains slightly less caffeine than a tablespoon of light roast grounds, but the difference is minor.
How Much Caffeine Is in Decaf
Decaf isn’t zero-caffeine. The decaffeination process removes at least 97% of the caffeine, leaving about 7 mg in a standard 8-ounce cup. A study of 16-ounce decaf coffees from nine U.S. chains found they contained 8.6 to 13.9 mg, with an average of 9.4 mg. Decaf espresso ranged from 3 to 15.8 mg per shot. Decaf instant coffee is the lowest, at roughly 3 to 5 mg per cup.
For most people, these amounts are negligible. But if you’re extremely sensitive to caffeine or avoiding it for medical reasons, those residual milligrams can add up over several cups.
The FDA’s Daily Limit
The FDA considers 400 mg of caffeine per day safe for most healthy adults. That’s roughly two to three 12-ounce cups of home-brewed coffee, or just one grande drip coffee from Starbucks with room to spare. A 2017 systematic review confirmed that 400 mg daily is not associated with negative health effects in the general adult population.
Caffeine has a half-life of 5 to 6 hours, meaning if you drink 200 mg at noon, about 100 mg is still circulating in your body by 5 or 6 PM. It can linger well beyond that at lower levels. This is why afternoon coffee disrupts sleep for some people even when the total daily amount stays under 400 mg. Timing matters as much as quantity.
Why Your Cup Varies So Much
The 95 to 200 mg range for a single cup of brewed coffee is wide for good reason. The amount of ground coffee used, the water temperature, the brew time, and even the grind size all influence how much caffeine ends up in your mug. A pour-over with a fine grind and long steep time extracts more caffeine than a quick French press with a coarse grind.
If you want to control your intake more precisely, espresso-based drinks are actually more predictable. Each shot delivers a relatively consistent 63 mg, so a latte with two shots gives you a reliable 126 mg. Drip coffee, by contrast, can swing by 100 mg or more depending on how it’s prepared, making it harder to estimate your daily total.