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Bottom Line: The average caffeine content of an 8-oz, brewed cup of coffee is 95 mg. A single espresso or espresso-based drink contains 63 mg, and decaf coffee contains about 3 mg of caffeine (on average).
Are Commercial Brands More Caffeinated?
Some commercial coffee brands contain more caffeine than regular, home-brewed coffee.
Coffee shops are also notorious for their large cup sizes, which can range up to 700 ml (24 oz). The amount of coffee in such cups is equivalent to about 3–5 regular-sized cups of coffee.
Starbucks is probably the best-known coffee shop in the world. It also offers some of the most caffeinated coffee available.
The caffeine content of brewed coffee at Starbucks is as follows (8, 9):
Short (8 oz): 180 mg
Tall (12 oz): 260 mg
Grande (16 oz): 330 mg
Venti (20 oz): 415 mg
Furthermore, one shot of espresso at Starbucks contains 75 mg of caffeine.
Consequently, all small, espresso-based drinks also contain 75 mg of caffeine. This includes lattes, cappuccinos, macchiatos and Americanos, among others (10).
Larger sizes, which are made with two, or even three, espresso shots (16 oz), likewise contain 150 or 225 mg of caffeine.
Decaf coffee from Starbucks contains 15–30 mg of caffeine, depending on cup size.
Bottom Line: An 8-oz, brewed coffee from Starbucks contains 180 mg of caffeine. A single espresso and espresso-based drinks contain 75 mg, while an 8-oz cup of decaf coffee contains about 15 mg of caffeine.
McDonald’s sells coffee all over the world, often under their McCafe brand.
However, despite being one of the biggest fast food chains that sells coffee, they do not standardize or calculate the amount of caffeine in their coffee.
As an estimate, the caffeine content of their brewed coffee is about (11):
Small (12 oz): 109 mg
Medium (16 oz): 145 mg
Large (21–24 oz): 180 mg
Their espresso contains 71 mg per serving, and decaf contains 8–14 mg, depending on the size of the cup.
Bottom Line: McDonald’s doesn’t standardize the amount of caffeine in their coffee. As an estimate, a small cup of brewed coffee contains 109 mg of caffeine. Espresso contains about 71 mg, and decaf has about 8 mg.
Dunkin Donuts is another chain of coffee and donut shops that is very popular worldwide. The caffeine content of their brewed coffee is as follows (12):
Small (10 oz): 215 mg
Medium (16 oz): 302 mg
Large (20 oz): 431 mg
Extra large (24 oz): 517 mg
Their single espresso shot contains 75 mg of caffeine, which is also how much you can expect to get from their espresso-based drinks.
Decaf coffee from Dunkin Donuts may also contain quite a bit of caffeine. According to one source, a small cup (10 oz) has 53 mg of caffeine, and a large cup (24 oz) contains 128 mg (13).
That’s almost as much caffeine as you find in other varieties of regular coffee.
Bottom Line: A small cup of coffee from Dunkin Donuts contains 215 mg of caffeine, while a single espresso contains 75 mg. Interestingly, their decaf coffee may contain as much as 53-128 mg of caffeine.