What is the caffeine content of a coffee bean?

In this guide, we will address the query “coffee bean caffeine content” and will discuss some topics related to this theme.

What is the caffeine content in a coffee bean?

Caffeine is the main alkaloid in coffee beans representing 0.61.2 to 2.2% of the dry bean weight. A single coffee bean has approximately 1.9 milligrams of caffeine for Arabica coffee beans and 2.9 milligrams for Robusta coffee beans.

Caffeine levels in coffee plants vary by plant species, but more than 98% of all coffee consumed in the world comes from just two varieties, Robusta and Arabica. It is possible to notice that the Robusta species has almost twice the caffeine compared to the Arabica species.

Roasted coffee beans contain higher concentration ofmore caffeine than green coffee beans. This can be explained by the roasting process that reduces the weight of the beans by removing water, without significantly changing the amount of caffeine. 

However, it is important to highlight that this amount of caffeine can change by the method of preparation of the drink. (1-3)

What is the composition of coffee beans?

In summary, coffee beans contain approximately 43% carbohydrates; 7.5–10% proteins; other nitrogenous compounds (0.6% – 2.8% caffeine); 10–15% lipids; 25% melanoidins, 3.7–5%minerals and ~6% organic and inorganic acids, and esters.(2) 

During roasting, there is no significant loss in terms of caffeine, its concentration will increase due to the degradation of other components.(3)

That said, green coffee beans — which are raw — aren’t very pleasant to eat. They have a bitter, woody flavor and can be hard to chew. Roasted coffee beans are slightly softer. (1)

What factors affect caffeine content?

Caffeine content and the quality of coffee beverages in general is affected by a number of elements and a series of processes, including: the environment, cultivation, post-harvest, fermentation, storage, roasting, and brewing to produce a cup of coffee.

Changes in bioactive and chemical compounds occur in all phases of coffee processing. 

Roasting is an essential stage in coffee manufacturing because it produces color, aroma, and flavor. 

Caffeine is moderately heat-stable during coffee roasting. Trigonelline, which is found in large concentrations in green coffee beans, is reduced constantly during the roasting process.

However, due to sublimation, caffeine loss at higher roast temperatures, caffeine concentration in dark-roast coffee tends to be lower than in lighter roasts. (3)

What is the daily dosage of caffeine?

The daily dosage of this compound should not surpass 45 mg caffeine/kg weight.

The caffeine and other chemicals present in the entire bean are just a fraction of what you receive from ordinary coffee since it is filtered and diluted with water. (4)

What are the health effects of caffeine and coffee beans?

Caffeine is a natural stimulant that impacts your brain and central nervous system, resulting in many benefits, like boosting energy, alertness, mood, memory, and performance. This chemical may also improve exercise performance and weight loss by boosting metabolism (1)

There are strong antioxidants in coffee beans, with chlorogenic acid being the most prevalent. Chlorogenic acid may lower your chance of developing diabetes and reduce inflammation, it may also have anti-cancer effects.

In coffee beans, the amount of chlorogenic acid depends on the kind of bean as well as the roasting processes used. Roasting can indeed result in a 50–95 percent reduction in chlorogenic acid, yet coffee beans are still considered one of the finest sources. (5, 6)

Does caffeine consumption have any adverse effects?

Caffeine can slightly reduce calcium absorption in the gastrointestinal tract. To mitigate the risk of osteoporosis and fractures, it is recommended to maintain adequate intake of calcium and vitamin D especially among elderly adults.

While the contribution of coffee to the development of hypertension is generally small, it can be more significant in infrequent coffee consumers. 

Additionally, coffee has modest cardiovascular effects, including tachycardia, high blood pressure, and occasional arrhythmia. These acute effects are more likely to occur immediately after coffee consumption or in individuals who are more susceptible. (7)

What is the caffeine content in a cup of coffee?

Different factors can drive the amount of caffeine in a cup of coffee and one of them is the type of beverage you are drinking. Different coffee brewing methods and serving sizes can result in different amounts of caffeine being ingested. Therefore, these are the approximate amounts of caffeine ingested in the main coffee preparation methods:

  • A drip machine coffee cup – 80 mg of caffeine
  • Manual filter coffee cup – 145 mg of caffeine
  • French Press coffee cup – 107 mg of caffeine
  • Percolated coffee cup – 200 mg of caffeine
  • Turkish or Greek coffee cup – 200 mg of caffeine
  • AeroPress coffee cup – 120 mg of caffeine
  • Espresso cup – 64 mg of caffeine

What affects the caffeine content in a coffee cup?

Several factors can impact the caffeine content in the coffee cup, but the main factor is the type of the coffee bean used. That said, other factors such as the type of roasting, the brewing method, the serving size and the amount of ground coffee that a person uses can also affect the amount of caffeine in a coffee cup.

Light roasts are beans that are roasted for a shorter time and the amount of acidity is higher because the longer the beans are roasted, the more the heat removes the acidity of the beans. 

Dark roasted coffee, on the other hand, has sweeter flavors because of the caramelization of the sugar at high temperatures, but has the least amount of acidity.

Although caffeine has a bitter taste, studies have shown that coffee bitterness stems from products of degradation of chlorogenic and caffeic acids. Besides, caffeine contributes greatly to coffee aroma. It reacts with other substances during roasting to form flavor compounds.

Some studies have shown that dark roasted coffee beans could contain less caffeine than light roasted coffee beans. However, this is due to the volume of the grains, because when the two roasts are compared by weight, the difference is not significant.

The more coffee a person puts to ground during the grinding process, the greater the amount of caffeine found in the beverage. However, the amount of time the coffee is ground, or the size of the particles, does not interfere with the amount of caffeine found in the beverage.

What are the main dietary sources of caffeine?

One of the main dietary sources of caffeine is coffee (approximately 40 mg per 100 grams), which is one of nature’s most powerful energy stimulants. In addition to coffee, caffeine is found in several other foods such as:

  • Tea leaves (11 mg per 100 grams)
  • Cocoa beans (230 mg per 100 grams)
  • Guaraná berries (470 mg per 100 grams)
  • Kola nuts (25 mg per 100 grams)
  • Yerba maté (70 mg per 100 grams)

Research suggests that moderate caffeine consumption may be associated with a number of beneficial physiological effects, including improved physical and mental performance. Furthermore, drinking coffee has been associated with a reduction in the risk of developing several diseases, such as Parkinson’s, prostate cancer and melanoma.

Why does coffee contain caffeine?

The main function of caffeine in the coffee plant is protection against pests since this substance is toxic to most pest species and it acts as a natural pesticide.

Caffeine also serves to protect the coffee tree from competition with other plants. Once the leaves and beans fall to the ground they release small amounts of caffeine directly into the soil, preventing the growth of other wild plants in the area since the caffeine acts as an inhibitor to other wild plants.

Another use of caffeine for the plant is to be an attractant to pollinators. The coffee plant flowers produce nectar, which has small amounts of caffeine in its composition, acting as an attractant for pollinating agents.

Other FAQs about Coffee that you may be interested in.

How much sodium is in coffee?

Is it possible to get food poisoning from coffee?

Is coffee good for a cough?


In this guide we discussed the query “coffee bean caffeine content” and some other topics related to this theme.


  1. Mary Jane Brown, Can You Eat Coffee Beans? All You Need to Know. Them. Healthline Media LLC. 2020
  2. Farah, Adriana.  Nutritional and health effects of coffee. 10.19103/AS.2017.0022.14. 2018.
  3. Bastian F, Hutabarat OS, Dirpan A, Nainu F, Harapan H, Emran TB, Simal-Gandara J. From Plantation to Cup: Changes in Bioactive Compounds during Coffee Processing. Foods. 2021
  4. Caroline Woelffel Silva, Keila Rodrigues Zanardi, et. al. Green coffee extract (Coffea canephora) improved the intestinal barrier and slowed colorectal cancer progression and its associated inflammation in rats, PharmaNutrition, 22, 2022.
  5. Wei, F., Furihata, K., Hu, F., Miyakawa, T., & Tanokura, M.  Complex mixture analysis of organic compounds in green coffee bean extract by two-dimensional NMR spectroscopy. Magnetic Resonance in Chemistry, 48(11), 857–865. 2010.
  6. Tajik, N., Tajik, M., Mack, I. et al. The potential effects of chlorogenic acid, the main phenolic components in coffee, on health: a comprehensive review of the literature. Eur J Nutr 56, 2215–2244. 2017.
  7. Bae, J.-H., Park, J.-H., Im, S.-S., & Song, D.-K.  Coffee and health. Integrative Medicine Research, 3(4), 189–191. 2014.

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