How Much Caffeine is in a Cup of Coffee?

Many of us have trouble functioning through the day without the caffeine punch in the morning. Coffee is the biggest and most common source of caffeine. While scientists are constantly reminding us of the adverse effect of caffeine on our cardiovascular health, some studies show us the benefits of caffeine on our system. Hope You Enjoy, How Much Caffeine is in a Cup of Coffee?

Before we jump into the judgment whether it good or bad for the health, it’s important to knowhow much caffeine is found in an average cup of coffee. Again, this is not as easy as it sounds to determine the exact amount as there different types and brands of coffees out there.

How Much Caffeine is in a Cup of Coffee?

What Is Caffeine?

Caffeine is a naturally occurring stimulant. It works by stimulating the central nervous system, and its primary effect is in the brain. There it occupies the neuroreceptors for adenosine, a chemical in the brain that tells you you’re tired, blocking them. So since you don’t get that message, you aren’t tired!

The chemical formula is C 8 H 10 N 4 O 2. Caffeine has a molar mass of 194.19 grams (6.85 ounces). It is soluble in water and many organic solvents, and it appears in pure form as white crystals.

How Much Caffeine is in a Cup of Coffee: in Different Types of Coffee

Brewed Coffee

Brewed coffee is widely popular around the world and it’s one of the simplest ways to make regular coffee. This coffee is made by pouring hot filtered water over ground coffee beans on a coffee pot or filter.

A regular coffee cup holds around 8oz of liquid and it contains around 80-140 mg of caffeine. We can roughly average the number to 95mg per cup. The caffeine content also varies depending on different brewing methods.

The caffeine content on per cup of coffee with different brewing methods:

  • French Press- 85-130 mg
  • Drip- 115-175 mg
  • Greek or Turkish- 150-240 mg
  • Percolated- 62-270 mg


Espresso is made by forcing a little amount of hot water through finely-ground coffee beans. Since the ratio of water to the coffee ground is higher in this method, it’s also richer in caffeine content than the brewing method. A standard shot of espresso holds about 150mg of caffeine.

However, you can make an espresso in a myriad of different ways. Therefore, the caffeine content also varies depending on the method used to prepare it.


The name might seem a bit puzzling but it’s nothing but our beloved good ol’ double espresso shot. You get two servings of expresso shot in one cup of doppio, As a standard espresso has around 150mg of caffeine, a doppio contains the double that means 300mg of caffeine in each serving.

Keep in mind that 300mg of caffeine is the maximum limit that’s advisable to consume in a day. So, if you’re planning to two doppios on a single day, proceed at your own risk. 


Lungo is synonymous with long espresso. The amount of coffee ground used is the same as a regular espresso shot. However, the difference is in the amount of water used to prepare it. Due to the extra water, it takes a longer time to pull.

As you use more water in a lungo, it has the same size as a double shot espresso. As caffeine is dissolved first during the extraction process, there will not be many differences in the amount of caffeine present in it. 


Ristretto is basically the opposite of lungo. You use less water with the same amount of coffee grounds used for other espresso shots. Since there’s a deficit in water, it creates a thicker and more concentrated brew. Some people prefer ristretto because of its strong flavor and taste. However, there’s no change in the amount of caffeine as you use the same amount of coffee grounds.

Instant Coffee

The caffeine content in instant coffee varies widely depending on the brand and type of grounds used to make the coffee. Usually, 1 teaspoon of instant coffee has 57mg of caffeine because Some instant coffee brands are making micro-ground coffee to enhance the flavor and caffeine.

The caffeine content will not be altered no matter how much water, milk, or sugar you add to the mixture. You can only increase or decrease the caffeine amount by adding up more or less coffee powder to the coffee.

Decaf Coffee

Among all the different variants of coffee, decaf has the lowest number of caffeine content in it. Many coffee drinkers want the flavor of the coffee but they want to avoid the caffeine. Decaf coffee is a perfect option for them.

Decaf coffee has 97% of its caffeine removed from it. The caffeine content in a decaf coffee depends on the type of bean used and the decaffeination process followed to prepare it so Decaf coffee is usually made with an organic solvent, water, or carbon dioxide to extract the caffeine out of the beans.

An average size 8oz coffee cup contains only about 7mg of caffeine. The total caffeine content of 10-12 cups of decaf coffee is similar to 1-2 cups of regular caffeinated coffee. So, if you can’t let go of the flavor of coffee from your life but you want to cut down the caffeine then decaf coffee is the best choice for you.

Cold Brew

The heat helps to extract the caffeine from the beans. However, cold brew has a completely different method to extract the caffeine from the beans. Cold brews are made by soaking the coffee beans or grounds to the water for about 10-12 hours.

Cold brew coffee is highly concentrated as they have a higher coffee to water ratio. After the entire soaking process, you get a sweet rich flavored coffee. However, the caffeine content is usually cut down to normal as they are cut with water or creamer before serving. A cold brew coffee contains around 92mg per serving.

How Much Caffeine is in a Cup of Coffee?

Which Roast Contain More Caffeine?

Coffee beans are roasted at different temperatures for distinct flavor and aroma. Many drinkers prefer dark roast over light roast as they have this conception that it has more caffeine content. Is that really the case?

Caffeine retains its properties during the roasting process and there aren’t any changes to it whether its dark roast or light roast. Beans with different types of roast have relatively the same amount of caffeine present in them.

Well, there’s a slight exception when you measure the beans by their weight and scoop. When the beans are measured by weight, you’ll not notice any changes in the caffeine content.

However, dark roast beans less dense as they’re roasted for a longer time compared to light roast beans. Therefore, when you take the coffee by the scoop, you’ll notice a tad bit different with the light roast having a little more caffeine content.

Caffeine Content in Commercial Brand Coffee

By now you have probably gained a clear idea of how much caffeine is in an average cup of coffee. However, did you wonder if the number is the same for the renowned coffee chains and shops? Take a look at the caffeine content of some of the most popular coffee brands out there.


Starbucks is one of the most popular coffee chains all around the globe. However, they’re also known for the high caffeine content on their beverages.

  • Espresso (1 shot) – 75 mg
  • Short (8 oz) – 180 mg
  • Tall (12 oz) – 260 mg
  • Grande (16 oz) – 330 mg
  • Venti  ( 20 oz) – 415 mg
  • Decaf    – 10 to 25 mg

Dunking Donuts

Dunkin Donuts is another popular coffee chain around the world. The caffeine content on their coffee is as follows:

  • Small (10oz) – 215 mg
  • Medium (16oz)– 302 mg
  • Large (20oz)– 415 mg
  • Extra Large (24oz)– 517 mg
  • Espresso (1 shot) – 75 mg
  • Decaf – 52 to 118 mg

The caffeine content in decaf of Dunkin Donuts is pretty similar to a regular cup of coffee.


The fast-food mogul sells coffee under the McCafe brand name. They don’t have any specific chart for the caffeine content on their drinks. However, we have come up with an estimation.

  • Small (12oz) – 109 mg
  • Medium (16oz) – 145 mg
  • Large (21-24oz) – 180 mg
  • Espresso (1 shot) – 71 mg
  • Decaf –  8-14 mg

Each type of coffee has different flavors but all have the bitter taste and aroma of coffee beans.

  • Regular caffeine can contain about 70mg – 140mg or maybe 95mg average.
  • Espresso coffee can contain about 63mg of caffeine in about 30ml – 50ml (1oz – 1,175 oz) and a cup of espresso can hold 125mg of caffeine.
  • Instant coffee is a freeze-dried coffee that dissolves in water. The caffeine content in instant coffee is less than ordinary coffee and can contain about 30mg – 90mg of caffeine.
  • Therefore, the amount of caffeine in each coffee can be more or less depending on the method of processing and the size of the coffee.

Side Effects of too much Caffeine

Caffeine helps to boost up your metabolism, alertness, and physical activity. However, nothing in the world is good, if consumed in excess. Studies have shown that caffeine consumption is good for health as long as it is consumed in a low-moderate amount. A high dosage of caffeine consumption on a regular basis can have severe side effects on your body.


We all chugged down cups after cups before the night of an exam to stay awake, right?

Caffeine helping people to stay awake is one of its most prominent features that people boast about. While a little extra energy is good but if you consume it in excess, you’ll have trouble falling asleep.

A little amount of coffee doesn’t have any adverse effects on the sleep cycle. However, if you keep on consuming it at an alarming rate then you’ll eventually have a hard time having some sleep at all. If you don’t the caffeine to hamper your sleep cycle then we recommend you to have it a couple of hours before your sleeping time. This will give your body some to wear off the effects of it.


Caffeine helps to increase alertness by blocking the effects of a chemical called adenosine, responsible for the feeling of tiredness. It also triggers adrenaline release that’s known to boost up the energy level.

High consumption of caffeine will lead to nervousness and other similar symptoms in people. You may have to go through withdrawal symptoms as well. As per Mayo Clinic, a healthy adult can consume about 400mg of caffeine per day. Keep in mind that a regular cup of coffee has about 95mg of caffeine in it.

Affects Digestive and Excretory System

Caffeine increases the amount of acid in the stomach which may lead to heartburn and upset stomach. The extra caffeine isn’t stored in the body, rather it’s processed in the liver that eventually excretes through urine. This is the reason we need to urinate shortly after having a caffeinated drink.


Be it coffee, cigarette, or alcohol, no addiction is good for the health. Caffeine surely has many benefits, however, it can eventually become a habit and later turn into an addiction. Studies have shown that caffeine releases similar types of brain chemicals as cocaine and amphetamines do. While this sounds highly alarming, you don’t have to completely avoid drinking coffee. Rather, you should maintain a moderate intake so that it doesn’t grow into an addiction. 

Increased Blood Pressure

Caffeine doesn’t directly induce a heart attack or stroke in most cases. Caffeine tends to raise the blood pressure level due to its stimulatory effect on the nervous system. High caffeine intake has shown to elevate the blood pressure rate and the heart rate as well.

It tends to cause atrial fibrillation, altered heartbeat rhythm if consumed in a large amount. However, the result isn’t this severe in most cases. People with a heart condition should avoid consuming coffee in excess. 


Caffeinated drinks are known to boost up our energy level. However, the result can be the opposite once it leaves the system. This is one of the caffeine withdrawal symptoms.

Should I Drink Coffee During Pregnancy?

Mayo Clinic suggests that you should limit your caffeine consumption to 200mg to 300mg during pregnancy. A large amount of caffeine is seen to interfere with estrogen production and the metabolism required to conceive.

Caffeine passes through the placenta within the bloodstream. It can increase the baby’s heart rate and metabolism rate as it is a stimulant. Excessive caffeine intake will slower the baby’s growth and may even lead to miscarriage. Try to consume as little caffeine as possible for the safety of the baby.

Final Thoughts

A morning without a warm of coffee is unimaginable for many out there. However, you should know the side effects of having excessive caffeine in your system. We have tried to give you as much information about different brands and brews of coffee so that you can trace the amount you’re consuming.

As an average cup of coffee contains about 95mg of caffeine, try not to have more than 3/4 cups per day. Moderate consumption will help you gain more focus, stay alter, and all the other benefits from the coffee.

Also, the amount of caffeine varies widely depending on the manufacturer or beans used to make it. Read the labels properly to ensure that you’re not exceeding the limit of your daily caffeine consumption.

For Coffee Lovers

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