How much caffeine is in a cup of coffee?

How much caffeine is in a cup of coffee? In answering this question, we have to look at four factors:

  1. The Brand

  2. The Brewing Method

  3. The Roast Level

  4. The Quantity

These four factors determine how much caffeine is in a cup of coffee.

Coffee brewing methods

The brewing method can be a big factor in contributing to how much caffeine is in a cup of coffee. There are over 20 unique methods for brewing coffee, I have listed the top 10 most common methods of brewing coffee below.

How much caffeine?

Your recommended daily intake of caffeine is 400 milligrams. Typically, an 8-ounce (236ml) brewed cup of coffee contains around 100 milligrams of caffeine this would account for 1/4 of the recommended daily intake. Whereas a cup of regular instant coffee contains about 62 milligrams of caffeine. At the opposite end of the scale is a one ounce shot of espresso which contains massive 65 milligrams of caffeine pair ounce. Even a decaffeinated coffee despite the name contains caffeine! A typical decaf coffee contains approximately 2 milligrams of caffeine.

The coffee beans effect on coffee

One of the main influences which affects the amount of caffeine in a cup of coffee is the origin of the coffee Bean used. There are over 120 different species of coffee plant and the beans from these various species have different caffeine contents. The two most popular are “Arabica” which alone accounts for 70 to 80% of the world’s coffee production, and “Robusta” which accounts for 20 to 30%. Caffeine content of Robusta beans is strong and contains roughly twice as much caffeine as Arabica beans. The Arabic beans contain approximately 32 to 40 grams of caffeine per kilo dry, whereas the Robusta beans contain 65 to 85 grams of caffeine per kilogram dry.

Roast level of the coffee

Another key factor which can affect the amount of caffeine in a cup of coffee is the roast level. Basically, the roast level is the time they have roasted the coffee bean, see our guide to roast levels here. As a general rule of thumb, the longer they have roasted the bean the less the caffeine content. Light roast coffees contain much more caffeine than dark roast coffees, because the caffeine has burned away during the roasting process.

Quantity Per cup

The amount of coffee in your Cup or the quantity, also determines the amount of caffeine. 1 US fluid ounce is 29.5ml, a regular coffee is 8-ounces which is 236.5ml.

brewed 8-ounce coffee is 95mg of caffeine
Coffee espresso 1-ounce 29.5ml 30g has 63.6mg of caffeine
Coffee decaffeinated 8-ounce 237g is 2.4mg of caffeine
8-oz cup of regular instant coffee contains about 62 mg of caffeine
Coffee instant chicory has 50.4mg of caffeine per 8-ounce 237g
Coffee instant French has 8mg caffeine per teaspoon
Instant mocha Coffee has 23.4mg caffeine per teaspoon

How much caffeine do I consume from other items?

Recent studies have shown 95% of adults in the United States consume caffeine contain from different food and drink products excluding coffee. The amount of caffeine consumed in these products is between 100 and 250 milligrams of  caffeine daily. So you see coffee is not the only source of caffeine in our daily diet caffeine is contained in varying quantities in other foods and drinks. One such example of this is Tea, An 8 ounce equivalent cup of green tea contains 28 milligrams of caffeine. A regular 11 ounce (330ml) kind of Cola contains 33 to 40 milligrams of caffeine. Chocolate contains 12 to 25 milligrams of caffeine per 1-oz serving, this depends on the cocoa content.

So how much caffeine is too much caffeine?

How much caffeine is too much caffeine? Well, the American dietary guideline recommends adults consume only 400 milligrams of caffeine per day. This would mean four 8-ounce brewed cups of coffee per day, which is two less than I would have on a regular day..

7 benefits of caffeine

There are many benefits to consuming higher amounts of caffeine in your diet. Below are Seven such benefits.

  1. Recently published research from Johns Hopkins University revealed that a 200 milligram caffeine pill considerably boosted memory consolidation. Read more..
  2. We know caffeine to relieve post workout Aches and pains by up to 50%. Read More..
  3. They have proven caffeine to help protect against Alzheimer’s disease, with several such studies showing coffee drinkers had an almost 65% lower risk of developing Alzheimer’s disease. Read More..
  4. Caffeine may protect against Parkinson’s disease, which studies having found coffee drinkers having a 30% to 60% lower risk of developing Parkinson’s disease. Read More..
  5. A study from Duke University reveals that caffeine may reduce fatty liver In patients with non-alcohol related fatty liver disease. Read More..
  6. A recent study of 450,000 people has shown caffeine may reduce a person’s chance of developing type 2 diabetes by approximately 25% to 50% although other Similar studies have shown much higher percentages. Read More.. 
  7. A moderate consumption of coffee may enhance weight loss, cognitive function, and alertness. Read More..

Caffeine is a great source of antioxidants

Believe it or not, caffeine accounts for a large percentage of antioxidants in the western diet. Caffeine itself is high in oxidants and many studies have shown the average Joe gets more antioxidants from his or her coffee consumption then from fruit and vegetables combined.

Nutrients in coffee

Another amazing thing about caffeine is that caffeine contains so many nutrients, for instance Caffeine a regular cup of coffee contains 11% of your recommended daily intake of vitamin B2 riboflavin. Considering this 11% of daily recommended intake is 11% per Cup, this can really add up to a substantial quantity of your advised daily intake.

A regular cup of coffee contains 6% per cup of the recommended daily intake of vitamin B5. Coffee contains 3% of your recommended daily intake of magnesium and potassium which once again is 3% per Cup. An additional 2% per cup of your recommended daily intake of vitamin B magnesium. Taken by themselves these are small percentages, but over 4 or 5 cups of coffee a day these add up to be a considerable volume of nutrients.

Read More..

Caffeine burns fat..

The next time you go to a health food store to pick up any commercial fat burning supplement and when you read the ingredients don’t be surprised that the supplement contains caffeine. The reason for this simple caffeine is one of the few known natural substances which has been proven to boost your metabolic rate, which burns fat. Studies have shown that caffeine can increase your metabolic rate by 12% which can increase fat burning by a massive 10%!


There are four factors which dictate the varying amount of caffeine per cup of coffee. What I’ve learned is caffeine is a great source of nutrients, a source of antioxidants and a natural appetite suppressant, which can stave off many neurological problems later in life. I would always recommend checking the amount of caffeine contained per serving in the ingredients section of any product. I hope this guide has cleared up most of your questions about caffeine if there are any more questions you have, please comment below. Enjoy your coffee.