What Is Coffee Acidity? How It Affects Flavor, pH & More

What Coffee Acidity Really Means

You've probably heard terms like low-acid coffee or high-acid coffee, but what does that actually mean? Is coffee acidic?

The answer is yes, but not necessarily in the way you might think. When most people hear the word "acidic," they immediately think of lime juice, vinegar, or something that causes stomach discomfort. In the coffee world, acidity plays a bigger role.

Coffee acidity is often used to describe the bright, vibrant, and complex flavors that make certain coffees unique and enjoyable. Acidity can refer to both a measurable chemical property and a sought-out flavor characteristic that contributes to a coffee's overall balance and complexity.

How Acidic Is Coffee and Its Typical Coffee pH Level

If you are wondering “is coffee acidic or basic”, yes! Coffee is acidic.

However, coffee acidity can refer to two different things:

• Chemical acidity, which refers to the actual pH level of coffee

• Sensory acidity, which refers to the brightness and flavor perception in a cup of coffee

In specialty coffee, acidity is generally considered a positive quality because it is what allows certain coffees to showcase tasting notes like citrus, red berries, apples, wine, passion fruit, and other fruit-forward characteristics.

Without acidity, many coffees would taste flat and almost one-dimensional.

What Makes Coffee Acidic

What makes coffee acidic is going to be the naturally occurring compounds that contribute to the overall coffee's multi-dimensional characteristics.

• Chlorogenic Acids: These are the major acids naturally found in green coffee beans and play a significant role in the coffee’s flavor development

• Citric Acid: This acid is responsible for the bright citrus notes often found in coffees with orange, lemon, and passionfruit characteristics

• Malic Acid: This is associated with apple-like qualities and can contribute to a refreshing cup of coffee

• Tartaric Acid: This is responsible for some of the wine-like characteristics found in coffee

• Phosphoric Acid: This contributes to bright, sparkling acidity 

How Coffee Acidity Affects Flavor, Aroma, and Taste Perception

Acidity plays an important role in coffee that people may not realize. Without acidity, coffee may taste:

• Flat

• One-dimensional

• Less vibrant

• Less complex

• Boring overall

Acidity contributes brightness, perceived sweetness, flavor clarity, and refreshing finishes. It helps create balance and allows those complexities to stand out.

I like to think of coffee acidity similarly to adding a finishing squeeze of lemon to a dish. This small addition can brighten flavors and make the entire dish taste more lively and expressive. Coffee acidity works the same way!

This is one of the many reasons coffee enthusiasts gravitate towards lighter roasts.

Factors That Influence Coffee Acidity, Including Origin, Roast, and Processing Method

Origin

This is the biggest factor. Generally speaking, coffees grown at higher altitudes tend to exhibit brighter and more pronounced acidity. 

Roast

Roast level is another major factor here. Light roasts preserve much more of the bean’s natural, original complexity, brightness, and acidity. 

Dark roasts, on the other hand, tend to mute acidity because they are roasted for longer. At this stage, you are enjoying the roaster’s craftsmanship and the emphasis on bolder, smoky flavors.

Coffee Processing Method

This refers to how the coffee cherry is harvested, stripped of its skin, and “processed” to get down to the clean green bean and be ready to roast.

• Washed: these coffees often have cleaner and brighter acidity, as the fruit is fully stripped from the coffee bean and washed to dry

• Natural Coffees: These tend to have fruitier acidity due to the full coffee cherry remaining on the bean for longer during the drying process

• Honey processed: these beans offer a balanced sweetness with a softer acidity; this is the perfect balance between washed and natural, since only some of the fruit is left on the coffee bean

How to Choose Coffee With Lower Acidity

If you are looking for coffees with lower perceived acidity, we would definitely recommend opting for a medium or dark roast coffee. 

Generally, medium and darker roasted coffees tend to have softer acidity and more of a balanced, chocolatey, and nutty flavor profile. 

Ultimately, finding the right coffee comes down to personal preference and deciding on which flavor profile best suits your palate. Coffee can vary and is unique in many different ways, so we recommend giving multiple roast levels a try and also tasting the difference between coffee blends and single origins to find your perfect cup.