What is the pH of coffee?

Most brewing methods produce coffee with a pH between 4.85 and 5.10. Espresso tends to be at the lower end (more acidic, pH ~4.9–5.0); paper-filtered drip coffee sits around 5.0–5.2; cold brew is typically 5.5–6.0. All of these are significantly less acidic than citrus juice (pH 2.5–3.5) and well within the range of most fruits. The pH of coffee varies with roast level, brew method, water chemistry, and extraction parameters.

Does dark roast coffee have less acid than light roast?

By pH measurement, yes — dark roast coffee is typically slightly less acidic (higher pH) than light roast. This is because roasting progressively degrades chlorogenic acids, the main acidic compounds in green coffee. A light roast retains more chlorogenic acids; a dark roast has fewer remaining. However, dark roast produces more Maillard-derived acids, and the net effect on perceived sourness is more complex than pH alone suggests. Many people experience light roast as tasting brighter and more acidic even though their pH difference is small.

Is cold brew less acidic than hot coffee?

By pH, yes. Research measuring the acidity of cold brew versus hot-brewed drip coffee found cold brew has a higher pH (less acidic) than hot brew made from the same beans. However, a 2018 study in Scientific Reports also found that cold brew had similar antioxidant activity despite lower acidity, and that titratable acidity — a better proxy for stomach acid secretion and perceived sourness — was not always lower in cold brew. The common claim that cold brew is '70% less acidic' is not supported by research comparing titratable acidity.

What is titratable acidity and how is it different from pH?

pH measures the concentration of free hydrogen ions in solution — the intensity of acidity at a single point. Titratable acidity (TA) measures the total acid content — how much base is required to neutralise all the acids in a sample. A beverage can have a low pH (highly intense acid presence) but low titratable acidity, or a relatively high pH with high titratable acidity. For effects on taste and stomach, titratable acidity is a better predictor than pH. A 2021 study in ACS Food Science & Technology found titratable acidity was more strongly correlated with perceived sourness in coffee than pH.

Does coffee acidity affect acid reflux?

The relationship between coffee pH and acid reflux is indirect. Coffee's stimulating effect on gastric acid secretion is primarily driven by other compounds — including N-alkanoyl-5-hydroxytryptamides — not by the coffee's own pH. Switching to cold brew or dark roast (both slightly higher pH) has some evidence behind it for reducing reflux symptoms in sensitive individuals, but the mechanism is not simply 'lower acid coffee entering your stomach.'

Brewing Science

Coffee pH Explained: What Acidity Means in the Cup

By Coffee Studies Editorial·Published July 18, 2026·5 min read

Quick answer

Coffee is mildly acidic, with a pH typically between 4.85 and 5.10 for most brewing methods — roughly in the range of a banana and significantly less acidic than orange juice (pH ~3.5) or vinegar (pH ~2.5). Darker roasts have a slightly higher pH than lighter roasts, because roasting degrades the chlorogenic acids responsible for much of coffee's chemical acidity. Cold brew also sits at a higher pH than hot-brewed coffee. However, pH alone does not predict how sour or acidic a coffee tastes — perceived acidity depends on titratable acidity (total acid content), not just pH.

A single white ceramic mug of black coffee on a bare pale stone surface, soft diffused daylight from above, minimalist composition

"Acidic" is one of the most frequently misused words in coffee discussion. Coffee is acidic — pH roughly 5.0 — but so is a banana. Understanding what coffee's pH actually measures, how it changes with roast and brew method, and why pH alone does not determine how sour coffee tastes requires separating three distinct things that are often conflated: pH, titratable acidity, and perceived sourness.

pH ~4.85–5.10

typical pH range for most brewed coffee — mildly acidic, comparable to many fruits; significantly less acidic than orange juice (~3.5), vinegar (~2.5), or cola (~2.5)^[1]

pH ≠ perceived sourness

titratable acidity — the total quantity of acid in solution, not just its concentration — correlates more strongly with perceived sour taste in coffee than pH does; two coffees with the same pH can taste very different in terms of brightness^[2]

Cold brew: higher pH, not necessarily less total acid

cold brew typically has a higher pH than hot-brewed coffee from the same beans, but research shows its titratable acidity is often comparable — the '70% less acidic' claim commonly cited for cold brew is not supported by controlled measurement^[3]

The pH scale and where coffee sits

The pH scale runs from 0 (most acidic) to 14 (most alkaline), with 7 as neutral. Every unit represents a tenfold difference in hydrogen ion concentration — pH 4 is ten times more acidic than pH 5.

Coffee at pH 5.0 sits comfortably in mild-acid territory:

Liquid	Approximate pH
Cola / Coca-Cola	2.4–2.8
Lemon juice	2.0–2.5
Orange juice	3.5–4.0
Wine (red)	3.5–4.0
Coffee (typical)	4.85–5.10
Tea (black)	5.5–6.0
Milk	6.5–6.8
Pure water	7.0

This context matters: coffee is frequently described as "highly acidic" in wellness discussions, but its pH is considerably milder than most commonly consumed acidic beverages^[1].

How brew method affects pH

A 2024 study published in Food Chemistry measured coffee acidity across eight different brewing methods and found meaningful variation in pH by method^[1]:

Figure

Approximate coffee pH by brewing method

Values in pH (higher = less acidic)

Cold brew (24h steep)

6.31highest pH of common methods — lower extraction temperature slows acid extraction and reduces total dissolved acids

French press

5.18no paper filter means more dissolved solids but relatively moderate acidity; pH varies with steep time

AeroPress

5.15short brew time and ability to control temperature gives moderate-pH results similar to French press

Drip coffee (paper filter)

5.09paper filter removes some acidic compounds with the oils; typical everyday cup pH

Pour-over (V60 / Chemex)

5.02similar to drip but often brewed lighter; tends toward the more acidic end of filtered methods

Espresso

4.92highest extraction pressure and concentration drives more acid into the small cup volume; most acidic by pH among hot methods

Moka pot

4.88pressure extraction similar to espresso mechanics; concentrated and acidic

pH values are approximate — actual results vary by coffee origin, roast level, grind size, water chemistry (mineral content affects buffering), and extraction parameters. The rank order is more reliable than the absolute values.^[1]

How roast level affects pH

Roasting progressively degrades chlorogenic acids (CGAs) — the dominant acidic compounds in green coffee. Light roasts retain more CGAs; dark roasts have fewer. The result is counterintuitive to many coffee drinkers^[5]:

Dark roast coffee has a higher pH (less acidic by measurement) than light roast coffee.

Yet many people experience light roast as tasting brighter and more vivid, and dark roast as tasting harsher rather than "less sour." The explanation involves two things happening simultaneously:

CGA degradation at dark roast temperatures reduces the primary source of organic acidity — raising pH
Maillard and pyrolysis products at dark roast temperatures introduce new bitter and astringent compounds that create a different sensory impression — not sour, but harsh

The harshness of dark roast is not sourness — it is bitterness from chlorogenic acid degradation products (quinolactones and phenyl indanes) and Maillard products. These taste harsh on a different sensory channel than acid brightness.

pH versus titratable acidity

This distinction is where most coffee pH discussions go wrong.

pH measures the concentration of free hydrogen ions in solution at a single point. It is an intensity measurement — how acidic the solution is right now.

Titratable acidity (TA) measures the total quantity of acid present — how much base would be required to neutralise all the acids in the sample. TA is sometimes called "total acid content" and is a better proxy for:

How much acid is available to interact with your stomach
How persistently and completely sour a coffee will taste
What happens to gastric acid secretion after drinking

A 2021 study in ACS Food Science & Technology systematically tested whether pH or titratable acidity better predicted perceived sourness in drip coffee. Titratable acidity was the stronger predictor. Two coffees at the same pH can taste very different if one has much higher TA — which happens when one has more dissolved acids at similar concentration^[2].

The cold brew pH myth

Cold brew is commonly marketed as having dramatically lower acidity than hot-brewed coffee, with some brands claiming "67% less acidic" or "70% less acidic."

A 2018 study in Scientific Reports measured both the pH and titratable acidity of cold brew versus hot-brewed drip coffee from the same beans and found^[3]:

Cold brew did have a higher pH (less intense acid concentration) than hot brew
Cold brew's titratable acidity was not significantly different from hot brew — the total acid content was similar
Both cold brew and hot brew had similar antioxidant activity

The implication: cold brew may be slightly gentler on acid intensity (pH), but the total amount of acid you are consuming is not dramatically different. The large percentage reductions in marketing copy derive from comparisons that measure pH rather than TA, or that compare cold brew to espresso concentrate rather than to drip coffee.

How coffee pH affects the stomach

The effect of coffee on gastric acid secretion is not simply a function of coffee's own pH. Coffee stimulates the stomach to secrete acid at levels above what coffee's pH alone would explain.

A 2010 study in the Journal of Agricultural and Food Chemistry investigating which coffee compounds stimulate gastric acid secretion identified N-alkanoyl-5-hydroxytryptamides (NATs) as a key stimulating compound — separate from coffee's pH^[4]. This means that reducing coffee's pH (switching to cold brew or dark roast) may have some effect on GI tolerance, but it does not fully address the mechanism by which coffee increases gastric acid.

The honest summary

Coffee's pH typically falls between 4.85 and 5.10 — mildly acidic, comparable to many fruits and considerably less acidic than citrus juice or carbonated drinks. Cold brew and dark roast both test at a slightly higher pH than hot brewed light roast coffee. However, pH alone predicts taste less accurately than titratable acidity, which measures total acid content rather than just its concentration. The widespread claim that cold brew is dramatically less acidic than hot coffee is supported by pH measurements but not by titratable acidity. Coffee's effect on stomach acid secretion is driven partly by non-pH compounds, which is why switching to lower-pH coffees does not always resolve GI sensitivity.

Frequently asked questions

What is the pH of coffee?: Most brewing methods produce coffee with a pH between 4.85 and 5.10. Espresso tends to be at the lower end (more acidic, pH ~4.9–5.0); paper-filtered drip coffee sits around 5.0–5.2; cold brew is typically 5.5–6.0. All of these are significantly less acidic than citrus juice (pH 2.5–3.5) and well within the range of most fruits. The pH of coffee varies with roast level, brew method, water chemistry, and extraction parameters.
Does dark roast coffee have less acid than light roast?: By pH measurement, yes — dark roast coffee is typically slightly less acidic (higher pH) than light roast. This is because roasting progressively degrades chlorogenic acids, the main acidic compounds in green coffee. A light roast retains more chlorogenic acids; a dark roast has fewer remaining. However, dark roast produces more Maillard-derived acids, and the net effect on perceived sourness is more complex than pH alone suggests. Many people experience light roast as tasting brighter and more acidic even though their pH difference is small.
Is cold brew less acidic than hot coffee?: By pH, yes. Research measuring the acidity of cold brew versus hot-brewed drip coffee found cold brew has a higher pH (less acidic) than hot brew made from the same beans. However, a 2018 study in Scientific Reports also found that cold brew had similar antioxidant activity despite lower acidity, and that titratable acidity — a better proxy for stomach acid secretion and perceived sourness — was not always lower in cold brew. The common claim that cold brew is '70% less acidic' is not supported by research comparing titratable acidity.
What is titratable acidity and how is it different from pH?: pH measures the concentration of free hydrogen ions in solution — the intensity of acidity at a single point. Titratable acidity (TA) measures the total acid content — how much base is required to neutralise all the acids in a sample. A beverage can have a low pH (highly intense acid presence) but low titratable acidity, or a relatively high pH with high titratable acidity. For effects on taste and stomach, titratable acidity is a better predictor than pH. A 2021 study in ACS Food Science & Technology found titratable acidity was more strongly correlated with perceived sourness in coffee than pH.
Does coffee acidity affect acid reflux?: The relationship between coffee pH and acid reflux is indirect. Coffee's stimulating effect on gastric acid secretion is primarily driven by other compounds — including N-alkanoyl-5-hydroxytryptamides — not by the coffee's own pH. Switching to cold brew or dark roast (both slightly higher pH) has some evidence behind it for reducing reflux symptoms in sensitive individuals, but the mechanism is not simply 'lower acid coffee entering your stomach.'

References

Every factual claim in this article is drawn from the sources below. See the source library for how we grade evidence.

[1]Comprehensive investigation of coffee acidity on eight different brewing methodsFood Chemistry · 2024 · Controlled trial · Tier 2 · Moderate
[2]Titratable Acidity, Perceived Sourness, and Liking of Acidity in Drip Brewed CoffeeACS Food Science & Technology · 2021 · Controlled trial · Tier 2 · Moderate
[3]Acidity and Antioxidant Activity of Cold Brew CoffeeScientific Reports · 2018 · Controlled trial · Tier 2 · Moderate
[4]Measurement of the Intracellular pH in Human Stomach Cells: Gastric Acid Secretory Potential of Coffee BeveragesJournal of Agricultural and Food Chemistry · 2010 · Observational study · Tier 2 · Moderate
[5]Brewing FundamentalsCoffee Science Foundation · Reference work · Tier 2 · Moderate