Decoding Tea Acidity: Unveiling the pH of Your Favorite Brew

Understanding pH: What Acidic Actually Means 

Before getting into tea specifically, it helps to understand what pH means and why it matters.

pH is a scale from 0 to 14 that measures how acidic or alkaline a liquid is. A pH of 7 is neutral, which is the pH of pure water. Anything below 7 is acidic. Anything above 7 is alkaline. The further you go from 7 in either direction, the more extreme the reading becomes.

To put this in everyday terms: lemon juice sits around pH 2, which is very acidic. Tomato juice is around pH 4. Black coffee is around pH 4.5 to 5. Milk is mildly alkaline at around pH 6.5 to 6.8. Baking soda sits at pH 9.

The "safe" threshold for beverages, particularly in terms of tooth enamel, is generally considered to be pH 5.5. Anything below that with regular exposure can begin to soften enamel over time. The good news is that most teas sit at or above this threshold.

There is also an important distinction to draw here between the pH of what you drink and the acidity you feel in your stomach. Stomach acid itself has a pH of around 1.5 to 3.5. It is highly acidic by design, because it needs to break down food. The "acidity" or discomfort many people feel after tea is usually a response happening in the oesophagus or the stomach lining, not a direct consequence of the pH of the tea itself. We will come back to this distinction later.

Is Tea Acidic or Alkaline?

The straightforward answer is that most teas are mildly acidic, but the degree varies considerably depending on what you are drinking.

Pure brewed black tea typically falls between pH 4.9 and 5.5. Green tea is closer to neutral, generally sitting between pH 6.5 and 7.5 depending on brewing method and variety, making it one of the gentler options available. Herbal teas range from near-neutral chamomile to quite acidic hibiscus or lemon blends.

To put this in context, most everyday teas are considerably less acidic than coffee, carbonated soft drinks, orange juice, or even some sports drinks. The reputation tea has for causing acidity in India is largely tied to how it is consumed, strong, milky, on an empty stomach, sometimes with biscuits, multiple times a day, rather than any inherent quality of the tea itself.

Tea pH Levels by Type: A Full Comparison 

Here is a clear look at where different teas sit on the pH scale, alongside some common reference points:

A few things stand out from this table. First, green tea is among the gentlest teas, sitting close to neutral in most brewing conditions. Second, hibiscus tea is far more acidic than most people realise, comparable to soft drinks. Third, milk itself is slightly acidic at pH 6.4 to 6.8, not alkaline as is commonly assumed, though it is close enough to neutral that adding it to black tea still brings the overall pH of the cup up. Fourth, the teas that tend to feel heavy on the stomach, strong black tea and chai, sit in the mildly acidic range but are still far gentler than coffee, fruit juices, or soft drinks.

What Makes Some Teas More Acidic Than Others?

The pH of tea is not fixed. Several variables influence where your cup lands on the scale.

Type of tea and how it is processed. The tea plant itself contains naturally occurring compounds including tannins, polyphenols, and gallic acid. How much of these compounds end up in your cup depends on the type of tea and how much it has been oxidised during processing. Black tea is fully oxidised, oolong is partially oxidised, and green tea is not oxidised at all. This is one reason why green tea ends up with a higher pH than black tea.

Brewing time. The longer you steep your tea, the more compounds are extracted from the leaves. Longer steeping lowers the pH slightly and makes the brew taste more astringent or bitter. A very strongly brewed black tea, the kind that looks almost opaque, is more acidic than a lightly steeped version of the same tea.

Water temperature. Hotter water extracts compounds more aggressively, which can affect both the flavour and the pH. This is one reason why cold brew tea is generally gentler and less astringent than hot brewed tea.

What you add to it. This is probably the biggest variable for everyday tea drinkers. Adding milk to your tea raises the pH of the cup even though milk itself is slightly acidic at pH 6.4 to 6.8. Because milk is closer to neutral than black tea, mixing the two brings the combined pH up, making the drink gentler overall. Adding lemon drops the pH sharply. Adding sugar has minimal impact on pH but affects the overall profile of the drink.

The water you use. Tap water in different cities has different mineral compositions and different pH levels. Hard water is more alkaline, which can buffer the acidity of the brewed tea slightly. Filtered or softened water changes this balance.

Additives in flavoured teas. Commercial flavoured teas, especially fruit-flavoured varieties, often include citric acid or other acidic flavour compounds. These can significantly lower the pH of the finished drink, making them more acidic than the base tea would be on its own.

Is Tea More Acidic Than Coffee?

For most people comparing the two, tea is the gentler option.

Black tea sits at around pH 4.9 to 5.5. Brewed coffee typically falls between pH 4.5 and 5.5. They are close, but black tea tends to come out slightly less acidic than most everyday coffees. Green tea, oolong, chamomile, and most herbal teas are all considerably less acidic than coffee.

Beyond pH, coffee also contains more caffeine than most teas, and caffeine has a well-documented effect on the lower oesophageal sphincter, the muscle that prevents stomach acid from travelling back up. A higher caffeine load means a stronger relaxation of that muscle, which is one reason coffee drinkers often experience more pronounced acid reflux symptoms than tea drinkers.

If you are switching from coffee to tea for stomach-related reasons, most tea varieties will feel gentler, particularly green, white, or herbal teas. Even a well-made masala chai with milk tends to be easier on the stomach than a strong black coffee.

Is Milk Tea or Masala Chai Acidic?

This is probably the most relevant question for most readers in India, where masala chai is the default daily beverage for a large part of the population.

Milk tea, when made with a reasonable quantity of milk, sits in the near-neutral pH range of around 6 to 7. While milk itself is slightly acidic at pH 6.4 to 6.8, it is considerably less acidic than black tea. When the two are combined, milk pulls the overall pH of the cup upward, making the drink gentler than plain black tea would be. This is why traditionally prepared masala chai is often easier on the stomach than strong plain tea.

However, a few things change this picture. If the chai is very strong, brewed for a long time with a high tea-to-milk ratio, the pH will be lower. Drinking it on an empty stomach amplifies the impact. And adding lemon, which some people do in certain preparations, drops the pH sharply.

The discomfort that many people associate with morning chai is often less about the pH of the chai itself and more about drinking something caffeinated on an empty stomach first thing in the morning. Having a small amount of food alongside reduces this considerably.

Our Masala Chai is crafted with whole spices including ginger, cardamom, and cloves, all of which have traditionally been considered digestive-friendly. When brewed with milk in a balanced ratio, it makes for a comforting cup that most stomachs handle well.

Does Drinking Tea Cause Acidity in the Stomach?

This is where the conversation becomes more nuanced.

The pH of the tea in your cup is only part of the story. What matters equally is how tea interacts with your digestive system, and that depends on a number of factors that go beyond pH.

Caffeine and the lower oesophageal sphincter. Tea contains caffeine, and caffeine can relax the lower oesophageal sphincter, the ring of muscle that sits between your oesophagus and stomach and prevents stomach acid from rising. When this muscle relaxes, stomach acid is more likely to travel upward, causing the burning sensation known as acid reflux. This effect is more pronounced in people who are sensitive to caffeine, and it is independent of whether the tea itself is acidic.

Tannins and gastric irritation. Tannins are polyphenolic compounds found in tea, particularly in strongly brewed black tea. They can stimulate gastric acid production in some people, which may contribute to discomfort, especially when tea is consumed on an empty stomach. This is one reason why strong, dark tea on an empty stomach often feels worse than a milky, lightly brewed cup after a meal.

Drinking on an empty stomach. This is probably the most common reason people experience discomfort from tea. An empty stomach is more sensitive to stimulation by caffeine and tannins. Having even a small amount of food before or alongside your tea significantly reduces the likelihood of any discomfort.

Frequency and quantity. A single cup of well-made tea is very different from four or five back-to-back cups through the morning. The cumulative effect of multiple cups, especially strong ones, increases the chance of discomfort regardless of the variety.

Individual sensitivity. Some people are simply more sensitive to caffeine or tannins than others. The same cup of tea that causes no issue for one person might feel uncomfortable for another. Listening to how your body responds and adjusting accordingly is more reliable than following a general rule.

It is also worth separating occasional discomfort from a persistent pattern. Occasional heaviness after tea is common and often easily addressed with the tips below. A consistent pattern of acid reflux or stomach pain is worth discussing with a doctor, as it may have causes beyond tea consumption.

Which Tea Is the Least Acidic?

If you are looking for teas that are easiest on the stomach, here is how they rank:

Green tea consistently comes out as the least acidic everyday tea, generally sitting between pH 6.5 and 7.5 depending on how it is brewed, which places it close to neutral. Our green tea range includes varieties like Kashmiri Kahwa, Jasmine Tea, and Rose Tea, all of which are light on the stomach and sit comfortably in the low-acid zone.

Chamomile tea is near neutral and is widely regarded as one of the most stomach-friendly herbal teas available. It is caffeine-free, which removes the oesophageal sphincter concern entirely.

Ginger tea sits in the mildly acidic range but ginger itself has traditionally been considered supportive of digestion. Our herbal teas include options that bring ginger into the cup in a balanced way.

Lemongrass tea is mildly acidic but generally well-tolerated. Our Lemongrass Chai combines lemongrass with other gentle ingredients for a cup that is both flavourful and easy to drink.

Milk tea and masala chai, when properly made with milk, move into the near-neutral range and are gentler than their plain black tea base.

The teas to be more careful with if you have a sensitive stomach are hibiscus, lemon, and other citrus or fruit-based herbal blends, which sit in the more acidic part of the scale.

How to Make Your Tea Easier on the Stomach

If you enjoy tea but occasionally find it heavy or uncomfortable, a few practical adjustments make a real difference:

Add milk. This single change raises the pH of black tea and chai significantly. The milk buffers the acidity and makes the cup gentler overall.

Do not brew for too long. Shorter steeping times mean fewer tannins extracted, a higher pH, and a less astringent cup. For black tea, three to four minutes is usually enough. Over-brewing darkens the cup and lowers the pH.

Avoid drinking tea on an empty stomach. Have a small bite of food before or alongside your tea. This reduces the direct contact of caffeine and tannins with an empty stomach lining.

Switch to green or herbal tea on sensitive days. Green tea, chamomile, and ginger-based teas are gentler alternatives when your stomach needs a lighter option.

Avoid adding lemon if you are prone to acidity. Lemon drops the pH of your tea considerably. On its own, lemon tea is one of the more acidic options in the category.

Keep your daily intake moderate. There is a meaningful difference between one or two cups of tea a day and five or six. Moderation reduces cumulative caffeine and tannin exposure, which tends to reduce the likelihood of discomfort.

Try cold brewing. Cold-brewed tea, made by steeping tea leaves in cold water for several hours, extracts compounds more slowly and gently. The result is a smoother, less astringent, and often less acidic cup compared to hot brewing.

Conclusion

Tea is mildly acidic, but that word, acidic, does not tell the whole story. A pH of 5 or 6 is a very different thing from the pH of the coffee, fruit juice, or soft drink sitting next to it on the shelf. Most everyday teas, including black tea, green tea, masala chai with milk, and most herbal blends, sit well within a range that the body handles easily.

The stomach acidity that many people in India associate with tea is usually not about the tea's pH at all. It is about how the tea is consumed: strong, black, on an empty stomach, first thing in the morning, several cups in a row. Change those habits, add milk, reduce brewing time, have something to eat alongside, and the experience of drinking tea changes considerably.

Green tea is the least acidic option and a good choice for anyone looking for something light and gentle. Masala chai made with milk sits comfortably in the near-neutral zone. Herbal teas vary by ingredient, with chamomile and ginger being among the most stomach-friendly options available.

Tea has been at the centre of Indian daily life for generations. Understanding the science behind it helps you make choices that suit your body rather than simply following received wisdom. Most people who think they cannot drink tea will find that they simply need to drink it differently.

Frequently Asked Questions

Is tea acidic or basic?
Tea is mildly acidic. Most varieties fall between pH 4.9 and 7 on the scale. Green tea sits closer to neutral, generally between pH 6.5 and 7.5 depending on brewing conditions. The acidity depends significantly on the type of tea, how long it is brewed, and what is added to the cup.

Which tea is the least acidic?
Green tea is consistently the least acidic everyday tea, generally sitting between pH 6.5 and 7.5, which places it close to neutral. Among herbal options, chamomile and ginger teas are also close to neutral and gentle on the stomach. Milk tea and masala chai made with a good proportion of milk land in a similar near-neutral range.

Is chai tea acidic?
Plain black tea, which forms the base of most chai, sits around pH 4.9 to 5.5 and is mildly acidic. When chai is made with milk in the traditional way, the overall pH of the cup rises because milk, at pH 6.4 to 6.8, is less acidic than the tea it is mixed into. The combined drink typically sits around pH 6 to 7. For most people, a well-made masala chai with milk is comfortable to drink and does not trigger acidity.

Is herbal tea acidic?
Herbal teas vary considerably. Chamomile and ginger teas are near neutral at pH 6 to 7 and gentle on the stomach. Hibiscus tea is significantly more acidic than most people realise, sitting at pH 2.5 to 3.5, which puts it in the same range as soft drinks. Citrus-based herbal blends are similarly acidic. Peppermint and spearmint teas are low in acidity but can relax the oesophageal sphincter in some individuals, which may cause reflux symptoms in sensitive people.

Is lemon tea acidic?
Yes, lemon tea is one of the more acidic tea options. Lemon juice itself has a pH of around 2 to 2.5, and adding it to tea drops the overall pH of the cup to around 3 to 4. If you are prone to acid reflux or have sensitive teeth, lemon tea is worth having in moderation.

Is milk tea acidic?
Milk itself is slightly acidic, sitting at pH 6.4 to 6.8, not alkaline as is commonly assumed. However, because it is considerably less acidic than brewed black tea, adding it to your cup brings the overall pH up. A properly made masala chai with milk typically sits around pH 6 to 7, which is near neutral and much gentler on the stomach than plain black tea or coffee.

Does drinking tea cause acidity?
For most people, drinking tea in moderation does not cause acidity. Discomfort is more commonly linked to drinking strong tea on an empty stomach, consuming multiple cups in quick succession, or individual sensitivity to caffeine or tannins. Adding milk, shortening steeping time, and having food alongside your tea are the most practical ways to reduce the chance of any discomfort.

Which is more acidic, coffee or tea?
In most cases, coffee is slightly more acidic than black tea. Black tea sits at around pH 4.9 to 5.5 while coffee typically falls between pH 4.5 and 5.5. Green tea and most herbal teas are considerably less acidic than coffee. If you are switching from coffee to tea for digestive reasons, most tea varieties will feel noticeably gentler.

Is tea good for acidity or bad?
It depends on the type of tea and how you consume it. Green tea, chamomile, and ginger-based teas are generally considered gentle options for people with sensitive stomachs. Strong black tea on an empty stomach can aggravate discomfort in some people. As a general principle, lighter teas brewed for less time and consumed with food are easier on the stomach than strong, plain black tea drunk first thing in the morning.