Matcha vs Coffee Acidity: pH Compared
Brewed matcha is mildly acidic at pH 5.6–6.3. Brewed coffee is more acidic at pH 4.85–5.1. Neither drink is alkaline — both sit below the neutral point of pH 7. Because pH is a logarithmic scale, the gap means coffee delivers several times more acid per cup than matcha, even though the numbers look close.
Matcha pH source: Najman et al., Molecules (2023)
⚠ Common myth: “Matcha is alkaline”
Matcha powder is sometimes described as “alkaline-forming” — a claim about how the body metabolizes it, not the drink’s actual pH. The brewed drink measures pH 5.6–6.3, which is mildly acidic. This is meaningfully less acidic than coffee, but it is not alkaline or neutral.
Side-by-side comparison
| Property | Coffee | Matcha | Note |
|---|---|---|---|
| Typical brewed pH | 4.85–5.1 | 5.6–6.3 | Lower = more acidic |
| Acidity category | Moderately acidic | Mildly acidic | Both are below pH 7 |
| Is it alkaline? | No | No | Neither drink is alkaline |
| Caffeine per cup | 80–120 mg (drip) | 30–70 mg (whisked) | Matcha roughly half the caffeine |
| L-theanine | Trace amounts | ~25–45 mg | Promotes calm focus |
| Titratable acidity | Higher | Lower | Total acid load, not just pH |
Why the pH gap is bigger than it looks
pH is a logarithmic scale. Each whole-number step represents a 10× change in hydrogen ion concentration. Coffee at pH 4.85 and matcha at pH 6.3 are separated by roughly 1.2–1.4 pH units — meaning coffee contains approximately 15–25× more free acid than matcha at those values. The numbers look close; the chemistry is not.
Titratable acidity (total acid load) also differs. Coffee has higher titratable acidity than matcha, which means the stomach must neutralize more acid per cup regardless of the pH reading alone.
The second lever: caffeine and L-theanine
Caffeine can relax the lower esophageal sphincter, which may worsen reflux symptoms independent of a drink’s pH. Matcha contains roughly half the caffeine of a drip coffee (30–70 mg vs 80–120 mg per cup). It also contains L-theanine, an amino acid that promotes a calmer, steadier energy release.
For people who experience jitters, crashes, or digestive discomfort from coffee, the combination of lower acidity and lower caffeine load is often the meaningful difference — not a single factor in isolation.
Frequently asked questions
Is matcha acidic or alkaline?
Matcha is mildly acidic. Brewed matcha has a pH of 5.6–6.3 according to peer-reviewed research (Najman et al., Molecules (2023)). Anything below pH 7 is acidic. Matcha is less acidic than coffee but it is not alkaline or neutral.
What is the pH of matcha?
Brewed matcha has a pH of approximately 5.6–6.3. This places it in the mildly acidic range — less acidic than coffee (pH 4.85–5.1) but still below the neutral point of pH 7.
Is matcha less acidic than coffee?
Yes. Coffee typically measures pH 4.85–5.1, while matcha measures pH 5.6–6.3. Because pH is a logarithmic scale, this difference means coffee delivers several times more acid per cup than matcha — a real and meaningful gap.
Does matcha cause acid reflux?
Matcha is less acidic than coffee, but it still contains caffeine, which can relax the lower esophageal sphincter and potentially worsen reflux in sensitive individuals. If you have GERD or chronic acid reflux, consult a healthcare provider before changing your diet.
Why do some sources say matcha is alkaline?
This is a common myth. Matcha powder is sometimes described as having an alkaline-forming effect on the body, but the brewed drink itself is mildly acidic at pH 5.6–6.3. The claim about alkaline-forming foods refers to a different concept (urinary pH after metabolism) and is not the same as the drink's actual pH.
Sources & methodology
- Matcha pH range: Najman M. et al., “Antioxidant Properties and Phenolic Profile of the Most Widely Consumed Commercial Teas in Poland,” Molecules 2023, 28(20), 7018. doi:10.3390/molecules28207018
- Coffee pH range: Rao N.Z. & Fuller M., “Acidity and Antioxidant Activity of Cold Brew Coffee,” Scientific Reports 2018. Multiple brew methods measured pH 4.85–5.10.
- pH is logarithmic: each unit represents a 10× change in hydrogen ion concentration. A difference of 1.2 pH units ≈ 15× difference in acidity.
- Caffeine figures: USDA FoodData Central; typical ranges vary by preparation.