Caffeine in a Cup of Coffee

If you have always wanted to know the amount of caffeine in a cup of coffee, here is the article to find the answer.  The largest dietary source of caffeine is coffee.  An average cup of coffee contains roughly 95mg of caffeine. Nevertheless, what is the amount of caffeine in a cup of coffee? The answer varies with various coffee drinks and ranges between zero and more than 500mg.

All replies to the question what is the amount of caffeine in a cup of coffee? Have been explained in details in the article.

Factors affecting amount of caffeine

  • Coffee beans varieties: Loads of coffee beans varieties exist. Naturally, the various types consist of different amounts of caffeine; hence caffeine content in coffee varies.
  • Coffee type: The amount of caffeine varies slightly different in espresso coffee, decaf coffee, instant coffee and coffee which has been brewed.
  • The size of the serving: The amount of caffeine is affected directly by the scale of the serving. Different cups have different capacity, hence different caffeine content.
  • Drying process: The method of coffee drying affects the amount of caffeine. Lighter coffee drying contains more caffeine than darker coffee drying. However, coffee which has been cooked darker have a strong flavor.

What is the amount of caffeine in a cup of coffee is dependent on the roasting method, the size of the serving, how you prepare the coffee and the type of coffee bean?

What is the amount of caffeine in a cup of coffee?

The type of coffee you are drinking determines the amount of caffeine in the cup.


You prepare this kind of coffee by pouring some amount of hot water in a cup containing coffee beans which have been grounded finely.

Despite having higher caffeine per volume compared to regular coffee, espresso coffee has less caffeine per serving, as espresso servings are small in size.

The general size of a single shot espresso coffee serving is 30-50ml. The amount of caffeine in the serving is roughly 63mg.

Brewed coffee

The common way of making coffee in US and Europe is brewing.  Coffee which is prepared by brewing is also termed as regular coffee. You can make brewed coffee by pouring boiling water over coffee beans which have been grounded and placed in a filter.

The caffeine content in a single cup of coffee is roughly 70-140mg but on average, the amount of caffeine is 95mg.

Instant coffee

Brewed coffee is used to prepare instant coffee. However, the brewed coffee must be freeze-dried.  The coffee is of an excellent and dry piece, which you dissolve in water.

The simplest means of preparing instant coffee is mixing hot water with a single or two teaspoons of dry coffee. Brewing is not a must.

Nevertheless, the amount of caffeine in instant coffee is less as compared to regular coffee. A single cup of instant coffee contains 30-90mg of caffeine.

Decaf coffee

Although the name suggests otherwise, it may be misleading, since the decaf coffee contains some caffeine.  The coffee is not free from caffeine but contains some amounts of caffeine in various proportions.

The amount of caffeine in a cup of decaf coffee ranges between 0-7mg. However, an average cup of decaf coffee contains 3mg of caffeine, but the numbers may be higher in some varieties, depending on the size of the cup, coffee type and means of decaffeinating.

Espresso based drinks

Various coffee drinks are prepared using espresso shots, which are mixed with different amounts and varieties of milk.  Some of these drinks include; Americanos, macchiato, and cappuccino.

The amount of caffeine in the drinks is equivalent to that of real espresso since milk does not contain any caffeine.

The average caffeine content in a single small cup is 63mg, while a large cup contains 125mg of caffeine.

What is the amount of caffeine in a cup of coffee from commercial brands?

The question of whether commercial brands are more caffeinated and what is the amount of caffeine in a cup of coffee from commercial brands continues to arise.  However, the truth is that some brands have more caffeine than regular coffee brewed at home.

Also, the cup size of many coffee shops is large and goes up to 700mg.  Such cups are equivalent to 3-5 cups of coffee having regular sizes.


Apart from being the most famous coffee shop in the world, the store offers the most caffeinated coffee.

The amount of caffeine in coffee brewed at the shop is:

  • Short 180mg
  • Tall 260mg
  • Grande 330mg
  • Venti 415mg

A shot of espresso at the shop has 75mg of caffeine, same as all small espresso-based drinks. These drinks include; Americanos, Cappuccinos, Macchiato, Lattes and others.

The amount of caffeine in great size drinks is 150 and 225mg. large size drinks are composed of two or three espresso shots.

Additionally, as per cup size, decaf coffee from the shop has 15-30mg of caffeine.


It is among the largest fast food chains selling coffee in the world but has not a standard amount of caffeine in their coffee drinks.

Brewed coffee from the shop has an estimate caffeine amount of;

  • Small; 109mg
  • Medium; 145mg
  • Large; 180mg

Depending on the serving cup, espresso from the shop has 71mg per serving, while decaf has 8-14mg of caffeine.

Dunkin Donuts

The shop is famous worldwide due to its coffee and donuts.  The amount of caffeine in coffee brewed from the shop is;

  • Small; 215mg
  • Medium; 302mg
  • Large; 431mg
  • Extra-large; 517mg

Caffeine addiction

The amount of caffeine in their single espresso shot is 75mg, which is also equivalent to caffeine in the espresso-based drinks.

Decaf coffee from the shop has some caffeine, with a small cup containing 53mg while large cups provide 128mg.

Should you worry about Caffeine Content?

Although coffee is good for your health due to the high antioxidant amounts, consuming large amounts of caffeine is associated with adverse effects, such as disruptions in sleep, restlessness, heart palpitations and anxiety.

Although in most people the consumption of 400-600mg/day of caffeine is not linked to adverse effects, different people get affected by caffeine differently.

Some people are affected by large amounts, while others are not, due to genetic differences. Therefore, you should use the right amount for your body.