Is Coffee Acidic? The pH of Coffee Explained

Is coffee acidic? Yes, mildly. Black coffee typically has a pH of about 4.85 to 5.13, which is less acidic than orange juice or soda but more acidic than water (pH 7). The “acidity” coffee pros praise in a cup is something different: a bright, lively flavor that does not map neatly onto pH.

That distinction explains a lot of confusion. A coffee can taste tangy without being much lower in pH, and a smooth, mellow cup is not necessarily “alkaline.” Here is what the numbers say and how to choose a gentler cup if acidity bothers you.

Is Coffee Acidic? What the pH Numbers Say

The pH scale runs from 0 to 14. Below 7 is acidic, above 7 is basic, and each whole step is a tenfold change. Coffee sits around 5.

A 2018 study from Thomas Jefferson University, published in Scientific Reports, measured the pH of hot and cold brew coffee made from six light-roasted origins. Hot brew samples ranged from pH 4.85 to 5.10, and cold brew samples from 4.96 to 5.13. You can read the paper on PubMed Central.

Values for drinks other than coffee are typical approximate ranges; individual products vary.

Acidity as Flavor vs Acidity as pH

When a tasting note calls a coffee “bright” or “acidic,” it describes a sensation: juicy, tangy, sparkling, like biting into an apple. That perception comes from a mix of organic acids in the brew, such as citric, malic, quinic and the chlorogenic acids.

pH measures only how many free hydrogen ions are in the liquid. Another measurement, titratable acidity, captures the total amount of acid present. The same Jefferson study found that hot brew had noticeably higher titratable acidity than cold brew even though their pH values were nearly the same, and that titratable acidity correlated poorly with pH. In plain terms:

• Two coffees can have almost identical pH but taste very different in brightness.
• “Low acid” on a label may refer to taste, pH, or neither, so look for specifics.
• Your tongue is responding to the kind and total amount of acids, not just the pH number.

What Makes Coffee More or Less Acidic?

Roast level

Lighter roasts generally keep more of the bright organic acids that taste fruity and tangy. Longer, darker roasting breaks down many of these compounds, so dark roasts tend to taste lower in acidity and heavier in body. Learn more in Light vs Medium vs Dark Roast.

Origin and processing

Many East African coffees are prized for vivid acidity, while Brazilian and Sumatran coffees are often described as lower in perceived acidity. Among the hot brews in the Jefferson study, an Ethiopian coffee was the most acidic by pH and the Brazilian sample the least, a small example of origin at work.

Brewing method

Cold brew does not have a meaningfully higher pH than hot coffee, according to that research, but it does extract fewer total acids. Many people find it tastes smoother for that reason. Our guide to making cold brew at home walks through the process.

Grind and brew time

Under-extraction, from too coarse a grind or too short a brew, can taste sour. Fixing your recipe can reduce that sharp edge without changing beans.

How to Make Coffee Taste Less Acidic

1. Choose medium-dark or dark roasts. They typically taste rounder and less tangy.
2. Pick mellow origins. Brazil, Sumatra and many Latin American blends lean nutty and chocolatey.
3. Try cold brew. Fewer total acids often mean a smoother cup.
4. Add milk or cream. Dairy softens perceived sourness and raises the pH of the cup slightly.
5. Dial in your brew. Grind a little finer or brew a bit longer if your coffee tastes sour rather than bright.
6. Drink it fresh and hot. Coffee left on a warmer for a long time can taste flat and sour.

If acidity triggers heartburn, our article on coffee and acid reflux covers what is known, and your doctor can help you decide what is right for you.

Try a Simple Acidity Taste Test

The easiest way to understand coffee acidity is to taste it side by side. Brew two coffees the same way, with the same ratio, grind and water temperature, and sip them as they cool:

• A bright cup: a fruity natural-process coffee such as our Ethiopia Natural.
• A mellow cup: a nutty, chocolatey coffee such as Brazil Santos.

Notice where you feel each one. Bright coffees tend to make your mouth water at the sides of the tongue, while mellow coffees feel rounder and heavier. Neither is better; it is simply a matter of what you enjoy.

Is Coffee Acidic? FAQ

What is the pH of black coffee?

Black coffee usually measures around pH 5. One study found hot brews from 4.85 to 5.10 and cold brews from 4.96 to 5.13, depending on the beans.

Is coffee more acidic than orange juice?

No. Orange juice is usually around pH 3.5, which is roughly 30 times more acidic than coffee at pH 5, because each pH step is a tenfold difference.

Is cold brew less acidic than hot coffee?

By pH, not really: research found nearly identical values. Cold brew does contain fewer total acids (lower titratable acidity), which is likely why many people find it smoother.

Does dark roast have less acid?

Dark roasts generally taste less acidic because roasting breaks down many of the bright organic acids. The pH difference may be modest, but the flavor difference is easy to notice.

The Bottom Line

Coffee is mildly acidic, around pH 5, and the brightness you taste depends more on which acids are present, and how many, than on pH alone. If you prefer a gentle cup, lean toward darker roasts, mellow origins and cold brew.

At Feel Espresso, try the nutty, chocolatey Brazil Santos, our Sumatra single origin, or our Cold Brew Coffee blend, each roasted 1–5 days before delivery.