Caffeine: Its Amount in Coffee And Its Effect

Caffeine amount in coffee. When we hear the word caffeine, we think of coffee first. In fact, caffeine is not only found in coffee, but also products like chocolate, green tea, or coca-cola, there are even caffeine tablets. Caffeine is a completely natural substance that stimulates our body. Using it in moderation maintains working capacity, improves mood, easier to focus.

arabica-robusta coffee

The amount of caffeine in coffee varies depending on the nature of the coffee tree. Robusta coffee beans contain much more caffeine than Arabica. There are few types of Arabica beans, so even Arabica coffee itself can have different amounts of caffeine. The amount of caffeine depends most on the height at which the coffee tree grows. The higher the coffee tree grows, the less caffeine in the beans. The tree growing higher gets more sun, so it is less attacked by pests. And that means less caffeine is needed for protection.

The following amounts of caffeine by type of coffee (100 g of coffee beans)

  • arabica 1000 - 1500 
  • mgliberica 700 - 2500 mg
  • mgrobusta 1100 - 2500

Caffeine content according to the level of coffee roasting

different coffee beans grounded

It is often assumed that the caffeine content in coffee depends on the level of roasting of the beans. Coffee roasting levels are light, medium, and dark. However, this does not mean that dark roasted coffee will have more caffeine. Even if it tastes sharper and bitterer. The level of roasting on a coffee package is usually indicated by numbers. The smaller the number, the lighter roasted coffee beans. This means the coffee will be more colorful, less bitter. The level of caffeine in coffee cannot be judged by the level of roasting.

Coffee preparation methods and caffeine

It is impossible to answer exactly how much caffeine is in your cup of coffee. However, the amount of caffeine in coffee is greatly influenced by the way the coffee is made. Many people think that espresso coffee has the most caffeine. Still, to think so is wrong. The amount of caffeine in a cup of coffee depends on what amount of coffee was used and how long the coffee had been in contact with water. The longer the coffee comes in contact with water, the more caffeine in your coffee cup.

When making espresso, coffee comes into contact with water much less than when it is ground or filtered. Therefore, in fact, a cup of filtered coffee or brewed coffee may contain more caffeine than espresso. Although the opposite is usually the case. To make it easier to imagine, I will provide a table for comparison. It shows different coffee drinks and the amount of caffeine in a certain size cup.

Coffee (ml)

Approximate Caffeine Content (Mg) / Cup Size

Filtered coffee

96 mg / 240 ml


70 mg / 30 ml


70 mg / 120 ml

Black coffee

65 mg / 180 ml


70 mg / 180 ml

Instant coffee

50 mg / 100 ml

Decaffeinated coffee

3 mg / 100 ml

If caffeine is used in moderation, you will not feel the negative effects. However, caffeine intake should be reduced if you experience certain symptoms. If you have an increased heart rate, anxiety, insomnia, diarrhea, frequent urination, stomach pain, constant thirst, nausea, or headache, try to give up caffeine and see if you feel better.

How many cups of coffee can I drink a day?

A particularly common question is - how many cups of coffee can you drink per day? You can hear some recommendations. Some argue that the optimal number of coffee cups per day is 2, others 3. But in reality, one recommendation may not be right for everyone. I have already mentioned, that the caffeine content of coffee is very different from the way it is prepared, no doubt, and the amount consumed.

One person can drink 6 different cups of coffee a day and not feel any negative effects on the body. And for another, perhaps after the second cup of coffee, the heart rate will increase, sleep will be disturbed. Everyone is individual. Therefore, the amount of coffee you drink is very different. The most important thing to listen to signals sent by your body.

Decaffeinated coffee

black arabica coffee cup

It would be difficult to grow decaffeinated coffee naturally. Because the coffee tree itself thus naturally protects against pests. While most people tolerate caffeine, there are those who choose decaffeinated coffee. Caffeine is removed from coffee in two ways. This is done even when the coffee beans are green and unroasted. The first way to remove caffeine from coffee is called the Swiss Water Process. It is the oldest caffeine removal method discovered back in 1933 in Switzerland. By removing the caffeine in this way, the green coffee beans are soaked in warm water. This is how the elements of caffeine and taste begin to dissolve in water.

The liquid is not drained and another batch of coffee beans is soaked in it. In this way, the caffeine dissolves again and the taste remains because the water has already been saturated with flavor. This removes the maximum amount of caffeine and retains the most flavor.

The second way to remove caffeine is carbon dioxide. This is a new way during which the coffee is exposed to liquefied gas. The gas seems to absorb the caffeine. Caffeine molecules are released from the beans, which are smaller than the taste. The gas with caffeine molecules is then separated and transferred to another container. This method is more expensive.

When choosing decaffeinated coffee, pay attention to its properties, country of origin, date of roasting. More and more people are choosing decaffeinated coffee, that's why producers and sellers are also paying more attention to it. It's made from higher quality beans and special attention is paid to its processing and roasting. That’s why finding good decaffeinated coffee today isn’t that hard.