How Many Milligrams of Caffeine in Coffee Cup: and Dangers of Drinking Coffee

Coffee is a popular drink and perhaps the most common source of caffeine. Caffeine content may vary greatly depending on several factors, including type, brewing method, and brand. do you know how many milligrams of caffeine in coffee cup: and Dangers of drinking coffee.

The tea vs coffee chart shows how much caffeine is in both. A 100g equivalent cup of coffee can contain 40 – 65mg depending on how it’s been processed.

Besides, coke or various beverages sugary drinks can also contain caffeine, but what has more is coffee. Do you often consume cappuccino? How much caffeine does it contain? If you consume too much it will have dangerous side effects.


What is caffeine in coffee?

Caffeine is a natural substance that is widely contained in tea, coffee, and cocoa plants. Once consumed, caffeine will be absorbed into the bloodstream and then taken to the liver to be broken down into compounds that can affect the function of various organs.


What affects caffeine content?

Many things have an effect on the caffeine content at a cup of java.

One of the main factors is the type of coffee beans. There are many species of coffee plants, and coffee beans of different plants in their caffeine content.

The two most popular plant species for producing coffee beans are:

  • Coffea arabica, commonly called Arabica
  • Coffea canephora, known to most people as Robusta

According to a 2016 study, Robusta coffee beans typically contain about twice as much caffeine as Arabica beans. The researchers found that Arabica beans contain 34.1- 38.5 g of caffeine per kilogram of dried coffee while Robusta beans contain 68.6-81.6 g of caffeine per kg of dried coffee.

Other factors that can affect the amount of caffeine in a cup of coffee are:

  • type of roasting
  • brewing method
  • the amount of ground coffee a person uses during the brewing process
  • portion size
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Other sources of caffeine

Although coffee may be the most popular source of caffeine, many other foods and beverages also contain these chemicals.

However, the FDA does not require manufacturers to list the amount of caffeine in packaged foods, beverages, or dietary supplements. Some other common sources of caffeine are below:


Tea contains a variety of caffeine, but the amount is usually less than a cup of coffee of a similar size. For example, an 8-ounce cup of green tea contains about 28 mg of caffeine, while a black tea of the same portion contains about 47 mg.

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Fizzy drinks and those that have a fruity taste, sometimes also contain caffeine. For example, an average of 12 ounces of cola cans contains about 33 mg of caffeine.


Energy drinks

Energy drinks often contain very substantial quantities of sugar and caffeine. This caffeine can be synthetic or from natural sources, such as guarana leaves.

The caffeine content of this drink varies significantly between brands. According to the FDA, the caffeine content of energy drinks typically ranges from 40 to 250 mg per 8 ounces. However, some brands of energy drinks can contain up to 316 mg of caffeine per 8 ounces.



Chocolate naturally contains caffeine, but the amount varies according to the cocoa content of chocolate. Darker chocolate usually contains more caffeine than lighter ones or milk chocolate.



Some over-the-counter and prescription medications contain caffeine to enhance painkillers. For example, Menstrual Relief Maximum Strength is a combination of 500 mg acetaminophen, 15 mg pyrilamine maleate, and 60 mg caffeine.


how many milligrams of caffeine in coffee cup: and Dangers of drinking coffee


How many milligrams of caffeine in coffee cup: and Dangers of drinking coffee

The caffeine content of a cup of coffee may vary greatly. Factors that affect caffeine content include brewing methods, types of beans, and the amount of coffee powder a person uses.

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An 8-ounce cup of coffee usually provides about 80-100 mg of caffeine, but some coffee drinks can contain more.

Here are the dangers of drinking too much coffee:

Consuming caffeine is usually safe for most people. But, a lot of caffeine may cause undesirable side effects.

These side effects can include:

  • Headaches
  • feeling restless
  • Twitter
  • irritability
  • Tremor
  • rapid heartbeat
  • difficulty sleeping or insomnia
  • abdominal pain
  • Nausea
  • Diarrhea
  • frequent urination


Caffeine content by type of coffee

Various kinds of coffee include varying quantities of caffeine. Here is the caffeine content of some of the most common types of coffee:

Brewed coffee

Brewed coffee is called filtered coffee, involving the manufacture of ground coffee beans in hot water. These mixtures are usually placed in paper, metal, or plastic filters that separate the powder from the brewed coffee.

People can make brewed coffee in a variety of ways, usually using filters, filter kettles, or French presses.

A cup of coffee with 8 ounces of brew usually contains about 95 mg of caffeine.


Decaffeinated coffee

Despite its decaffeinated name, this coffee still contains caffeine. For example, an average of 8 ounces of decaffeinated coffee cups brewed contains about 2 mg of caffeine.


Cold drinks

Cold brew coffee is different from iced coffee, which only involves serving brewed coffee on ice. To make cold coffee, the manufacturer soaks the coffee powder in water at room temperature between 8 and 24 hours.

A 2017 study found that a 12-ounce cup of cold coffee can contain between 153 mg and 238 mg of caffeine.


Instant coffee

Make this type of coffee by adding hot water to instant coffee powder or granules. Immediate coffee generally contains less caffeine compared to freshly brewed java. A regular 8-ounce cup of instant coffee contains about 62 mg of caffeine.

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Espresso is a powerful coffee drink, made by forcing hot water or steam through a very fine coffee powder. Making espresso coffee involves using a mocha machine or stove.

The serving size of the espresso is generally much smaller than brewed coffee due to its high caffeine content.

One 1-ounce espresso glass contains about 63 mg of caffeine.


The caffeine content of popular coffee brands

Many manufacturers and food stores provide estimates of caffeine content in their coffee products.

Dunkin Donuts

Dunkin Donuts is a popular coffee and doughnut retailer offering a variety of caffeinated beverages.

According to caffeine informer, the caffeine content of a medium cup (14 ounces) of some coffee drinks offered at Dunkin Donuts is as follows:

  • Brewed coffee: 210 mg
  • coffee brewed decaffeinated coffee: 10 mg
  • American: 249 mg
  • Cold drinks: 260 mg
  • latte: 119 mg
  • Espresso contains 85 mg per shingle shot.



Starbucks is one of the most well-known coffee manufacturers on earth. The company lists the caffeine content of their coffee products along with other nutritional information in their online beverage menu.

The caffeine content of cups is high (12 ounces), some Starbucks drinks are as follows:

  • Pike Place roast: 235 mg
  • Decaffeinated Pike Place roasted coffee: 20 mg
  • Cold drinks with cold foam: 155 mg
  • caramel macchiato: 75 mg
  • cappuccino: 75 mg


Caffeine Daily Consumption Recommendations

Some research suggests for adults consuming no more than 400 mg of caffeine per day.

There are no established guidelines for children, but the American Academy of Pediatrics does not advise children and adolescents to consume caffeine, according to the FDA.

The authors of a systematic 2017 review suggested that adolescents aged 12-18 should consume less than 100 mg of caffeine per day.

They also warn that caffeine may have a stronger effect on children under 12 years of age because they tend to be less overweight. The authors concluded that small children can tolerate an average of 2.5 mg of caffeine per 1 kg of body weight.


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