How Much Caffeine Is in a Cup of Coffee?

by Anne Franklin 5 min read

Stainless steel coffee maker brewing into a clear mug

Is your daily cup a gentle nudge or a full-blown jolt?

The answer depends on more than just the size of your coffee and how it's prepared. From your cozy morning brew to the espresso shot that propels you through an afternoon slump, caffeine levels can vary dramatically. Here's a closer look at what you might expect:

Factors That Influence Caffeine Levels

The amount of caffeine in your morning cup of joe can vary quite a bit depending on several factors:

  • Type of beans: The type of coffee beans used to make your coffee impacts the caffeine content. Arabica beans generally contain less caffeine than Robusta beans, which are the two main types of coffee beans.
  • Roasting method: Light roasts actually have more caffeine than dark roasts because roasting reduces the bean's caffeine content. The longer the beans are roasted, the more caffeine is burned off.
  • Brewing method: The brewing method also affects caffeine levels. Drip coffee has more caffeine than a cold brew concentrate that is later diluted with water or milk. Espresso has the highest concentration of caffeine because the beans are finely ground and brewed under pressure.
  • Serving size: A 12 oz cup of drip coffee will generally have much more caffeine than a 2 oz double espresso shot.

Caffeine in Different Coffee Drinks

Coffee drinks can vary widely in their caffeine content, depending on how they are prepared. Here's a look at some of the most popular types of coffee and their typical caffeine levels:

Decaf Coffee

Decaf coffee is regular coffee that has gone through a process to remove nearly all of the caffeine while keeping flavor. An 8-ounce cup of decaf typically contains 2-15mg of caffeine. 

Brewed Coffee

A standard 8-ounce cup of brewed coffee made from ground coffee beans contains about 95mg of caffeine on average. It is important to note, however, that caffeine content varies depending on factors such as the coffee bean variety, roasting, and brewing method.  

Instant Coffee 

An 8-ounce cup of regular instant coffee has about 57mg of caffeine on average.

This is less than brewed coffee since some caffeine is lost in the process of drying the coffee extract. However, caffeine content can still vary between 30-90mg per cup, depending on the specific brand and ingredients.


A single 1-ounce shot of espresso has around 63mg of caffeine. Some specialty espresso drinks contain two shots of espresso, so they will have a higher caffeine content. 

Caffeine Content by Serving Size

Did you know that not all coffee cups pack the same punch when it comes to caffeine? The caffeine content in a cup of coffee increases along with serving size. Generally speaking, here’s what you’re looking at.

  • 8 oz cup: This is the standard "small" size coffee you'd get at a coffee shop, and it contains approximately 95-100 mg of caffeine. 
  • 12 oz cup: A 12 oz cup is a typical "medium" sized coffee, and at this serving size, you're looking at an average of about 130-180 mg of caffeine.
  • 16 oz cup: This larger cup size is a common "large" coffee, which can contain roughly 180-240 mg of caffeine.

Caffeine Compared to Other Beverages

When it comes to caffeine content, coffee isn't the only beverage you need to pay attention to. Here's how the caffeine content in coffee stacks up against other popular caffeinated drinks:


A 12-ounce can of soda has between 30-40mg of caffeine on average, which is less than an average cup of coffee. Cola-type sodas like Coke or Pepsi tend to have a higher caffeine content than non-cola sodas.


Tea has varying amounts of caffeine, depending on the type and brewing method. Black tea has around 47-90mg of caffeine per 8-ounce serving, green tea 30-70mg per 8-ounce serving, and white tea has even less, with just 6-50mg per 8-ounce serving.

Energy Drinks

Energy drinks have very high caffeine levels, sometimes as much as 300mg per 8 to 12-ounce serving. This is equivalent to drinking almost 3 to 4 cups of coffee. 

Why It’s Important to Be Mindful of Your Caffeine Intake

While some enjoy a morning pick-me-up, others rocket through their day fueled by endless cups. But this extra buzz can lead to some health issues, including:

  • Jitters: - When you consume more caffeine than your body can handle, it can make you feel shaky and jittery. You may notice your hands trembling or feel unusually nervous and restless.
  • Insomnia: Caffeine is a stimulant that can keep you feeling energized and alert, which can disrupt your normal sleep patterns and, in turn, reduce the general quality of your life. 
  • Fast heartbeat: Excess caffeine can cause heart palpitations, where it feels like your heart is beating abnormally fast or pounding in your chest. This can be alarming, but for most people, it's not dangerous. 
  • Anxiety/irritation: Too much caffeine can induce feelings of anxiety, nervousness, and irritability. You may feel more stressed out and quick to anger when over-caffeinated. 
  • Dehydration: Caffeine is a diuretic, which means it increases urine production. This can lead to dehydration if you don't drink enough fluids to compensate.
  • High blood pressure: Regular high caffeine intake can contribute to high blood pressure, especially in people who are already at risk.

Check Your Coffee Consumption Habits to Strike a Healthy Balance

How many cups of coffee do you typically drink per day? Are you aware of how much caffeine is in every cup? Would it be beneficial to track your coffee and caffeine intake? Your answers to these questions can help you determine if it might be valuable to adjust your coffee drinking habits.

It's worth noting that it's not just the caffeine in your coffee that can affect you. Many of us add milk, sugar, flavored syrups, or whipped cream to our coffee, which can increase the calorie content. Always endeavor to strike a healthy balance, getting the pick-me-up you need without indulging in too many extras.

Key Takeaway

Moderating your caffeine intake comes down to being mindful of serving sizes. Stick to standard coffee cup sizes instead of mega cups, especially for high-caffeine drinks like espresso.

Pay attention to your own tolerance, as some people can handle more caffeine than others. Also, try alternating caffeinated drinks with decaf or herbal teas if you’re looking to reduce your caffeine intake. Some people find slowly tapering caffeine over a few weeks helps the body adjust.


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