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Is coffee acidic?

Acidity, variations, and health effects

Even coffee lovers may wonder whether coffee is acidic and how acidity may affect their health. This article reviews whether coffee is acidic, its effects on certain health conditions, and some ways to lower its acidity.

This article is based on scientific evidence, written by experts, and fact-checked by experts.
We look at both sides of the argument and strive to be objective, unbiased, and honest.
Is coffee acidic?
Last updated on June 22, 2023, and last reviewed by an expert on August 6, 2022.

As one of the most popular beverages in the world, coffee is here to stay.

Is coffee acidic?

Still, coffee lovers may be curious whether this beverage is acidic and how its acidity may impact their health.

This article reviews whether coffee is acidic, its effects on certain health conditions, and some ways to modify its acidity.

In this article


Acidity is generally determined using the pH scale, which specifies how basic or acidic a water-based solution is. The scale ranges from 0 to 14. Any solution registering from 0 to 7 on the scale is considered acidic, whereas a solution registering from 7 to 14 is considered basic.

Most coffee varieties are acidic, with an average pH of 4.85 to 5.10.

Among the countless compounds in this beverage, the brewing process releases nine major acids that contribute to its unique flavor profile.

The nine significant acid levels in coffee are listed from highest to lowest: chlorogenic, quinic, citric, acetic, lactic, malic, phosphoric, linoleic, and palmitic.

Summary: The brewing process releases acids from coffee beans, giving this beverage a pH of 4.85 to 5.10, which is considered acidic.

Variations in acidity

Regarding the acidity of coffee, several factors can play a role.


One main aspect determining coffee’s acidity is how it’s roasted. Both roasting duration and temperature have been correlated with acidity.

One study showed that the longer and hotter coffee beans were roasted, the lower their chlorogenic acid levels.

This suggests that lighter roasts tend to be higher in acidity while darker roasts are lower.


Another factor that affects acidity is the brewing method.

One study found that cold-brewed coffee was significantly lower in acidity than hot coffee.

Brewing time also appears to affect overall acidity, with a shorter duration resulting in a more acidic beverage and a moderate duration resulting in a less acidic one.

Coffee ground size

The size of the coffee grounds can also affect acidity. The smaller the ground, the greater the surface area exposed relative to volume, which can lead to more acid being extracted in the brewing process.

Therefore, a finer grind may result in a more acidic coffee.

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Summary: Several factors contribute to coffee’s acidity. The main ones are the roasting duration, brewing method, and fineness of the grind.

Possible effects on health

While coffee’s acidity is fine for most people, it may aggravate certain health conditions in others.

These conditions include acid reflux, gastric ulcers, and irritable bowel syndrome (IBS). Coffee’s effects on these conditions are mainly attributed to its acidity and slight laxative effect in some people.

Coffee has not been shown to cause these conditions. However, if you have been diagnosed with one, avoiding coffee is often recommended.

Alternatively, some people may benefit from simply opting for less acidic varieties.

Ways to reduce acidity

The acidity of coffee may be limiting for some. Here are a few ways to reduce it:

Summary: Because coffee is acidic, it may impact certain health conditions, such as acid reflux and IBS. Thus, some people may have to avoid it. Although the acidity of this beverage cannot be eliminated, there are several ways to reduce it.


Most coffees are considered somewhat acidic, with an average pH of 4.85 to 5.10.

While this doesn’t present a problem for most coffee lovers, acidity can negatively affect certain health conditions in some people, such as acid reflux and IBS.

Suggested read: How much caffeine does tea have compared with coffee?

There are several methods of reducing acidity, such as drinking cold brew coffee and choosing darker roasts. Using these strategies, you can enjoy your cup of java while reducing the side effects of its acidity.

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