You can expect to get around 95 mg of caffeine from an average cup of coffee.However, this amount varies between different coffee drinks, and can range from almost zero to over 500 mg. This is a detailed guide to the caffeine content of different types and brands of coffee.

FACTORS AFFECT CAFFEINE CONTENT

Types of coffee beans:There are many varieties of coffee beans available,which may naturally contain different amounts of caffeine.

Roasting:Lighter roasts have more caffeine than darker roasts, although the darker roasts have a deeper flavor.

Type of coffee:The caffeine content can vary significantly between regularly brewed coffee, espresso,instant coffee and decaf coffee.

Serving size:"one cup of coffee" can range anywhere from 30-700 ml(1-24 oz), greatly affecting the total caffeine content.

Caffeine content is affected by the type of coffee bean,roast style, how the coffee is prepared and the serving size.

CAFFEINE IN CUP OF COFFEE:

BREWED COFFEE:

Brewing is the most common way to make coffee in the US and Europe.Also known as regular coffee, brewed coffee is made by pouring hot or boiling water over ground coffee beans, usually contained in a filter. One cup of brewed coffee (8 oz) contains about 70-140 mg of caffeine, or about 95 mg on average.

ESPRESSO:

Espresso is made by forcing a small amount of hot water, or steam, through finely ground coffee beans. Although espresso has more caffeine per volume than regular coffee, it usually contains less per serving, since espresso servings tend to be small. One shot of espresso is generally about 30–50 ml (1–1.75 oz), and contains about 63 mg of caffeine. A double shot of espresso therefore contains roughly 125 mg of caffeine.

ESPRESSO-BASED DRINKS:

Many popular coffee drinks are made from espresso shots mixed with varying types and amounts of milk. These include lattes, cappuccinos, macchiatos and Americanos. Since the milk does not contain any additional caffeine, these drinks contain the same amount of caffeine as straight espresso. A single (small) contains about 63 mg of caffeine on average, and double (large) contains about 125 mg.

INSTANT COFFEE:

Instant coffee is made from brewed coffee that has been freeze-dried or spray-dried. It is generally in large, dry pieces, which dissolve in water. To prepare instant coffee, simply mix one or two teaspoons of dried coffee with hot water. There is no need for any brewing. Instant coffee usually contains less caffeine than regular coffee, with one cup containing roughly 30–90 mg.

DECAF COFFEE:

Although the name may be deceiving, decaf coffee is not entirely caffeine free. It may contain varying amounts of caffeine, ranging from 0–7 mg per cup, with the average cup containing 3 mg. However, some varieties may contain even higher amounts of caffeine, depending on the type of coffee, method of de-caffeination and cup size. 

MC DONALD'S:

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:

  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.

DUNKIN DONUTS:

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:

 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.  

That’s almost as much caffeine as you find in other varieties of regular coffee.