Most fruits are at least mildly acidic, but a handful sit close to neutral on the pH scale and qualify as genuinely low-acid options. Bananas, watermelon, cantaloupe, honeydew melon, dates, figs, persimmons, and papaya all have pH values above 5.0, with some melons and dates pushing past 6.0 into near-neutral territory. That puts them in a different category from the citrus fruits, berries, and stone fruits that dominate grocery shelves. The ranking is less straightforward than a single list, though, because ripeness, variety, and growing conditions can shift a fruit’s acidity enough to move it between categories.
How Fruit Acidity Is Measured
Two numbers matter when talking about how acidic a fruit is. The first is pH, which measures how many free hydrogen ions are floating around in the fruit’s juice. The scale runs from 0 (extremely acidic) to 14 (extremely alkaline), with 7 being neutral. Most fruits fall somewhere between 2.0 and 7.0. The second measurement is titratable acidity, which captures the total amount of acid present, including acids that haven’t fully released their hydrogen ions yet. A fruit can have a relatively high pH (meaning it doesn’t taste as sour) while still containing a fair amount of total acid, or vice versa. For practical purposes, pH is what most people care about when they want to avoid acidic foods, since it reflects what your teeth, stomach lining, and esophagus actually encounter.
The dominant acids in most fruits are citric acid and malic acid. Citrus fruits are loaded with citric acid, as the name suggests. Apples and stone fruits lean more heavily on malic acid. Grapes contain a mix of both tartaric and malic acids. In bananas, the acidity comes mainly from malic, citric, and oxalic acids, with potassium playing a buffering role that helps keep the overall pH relatively high.1PubMed Central. A model approach revealed the relationship between banana pulp acidity and composition during growth and post harvest ripening The specific mix of acids, combined with sugar content and mineral composition, determines where any given fruit lands on the acidity spectrum.
The Lowest-Acid Fruits
If you’re looking for fruits that barely register as acidic, these are your best options, roughly ordered from least acidic to mildly acidic:
- Dates: With pH values typically between 6.5 and 7.5, dates are about as close to neutral as a fruit gets. Their extremely high sugar content and low water content mean there’s very little free acid to speak of.
- Cantaloupe and honeydew melon: Both generally fall in the 6.0 to 6.7 range, making them the least acidic of the commonly available fresh fruits. Their high water content dilutes whatever acid is present.
- Avocado: Often hovering around 6.0 to 7.0, avocados are a fruit in the botanical sense and an exceptionally mild one. Their fat content and low sugar make them behave nothing like a typical fruit in the mouth or the stomach.
- Persimmons: Ripe persimmons typically measure between 5.4 and 7.0, depending on the variety. The Fuyu type, eaten firm like an apple, tends to be milder than the Hachiya type.
- Watermelon: Usually around 5.2 to 5.8. Watermelon’s very high water content helps keep the acid concentration low, which is why it rarely causes trouble for people with sensitive stomachs.
- Papaya: Generally in the 5.0 to 6.0 range. Papaya also contains the enzyme papain, which can aid digestion, making it a popular recommendation for people who struggle with acidic foods.
- Figs: Fresh figs sit around 5.0 to 6.0. Dried figs can be slightly more concentrated but still remain on the low-acid end.
- Bananas: Ripe bananas typically measure 4.5 to 5.2. That puts them at the top end of what most people would call “low acid.” Green bananas are more acidic and contain more starch, which is why they taste tangier.
The common thread among these fruits is relatively low concentrations of citric and malic acid, combined with minerals like potassium that buffer whatever acid is present. Melons, in particular, are mostly water, so even the small amount of acid in their flesh gets diluted to near-insignificance.
The Middle Ground
A large group of fruits falls into a moderately acidic range, roughly pH 3.5 to 5.0. These aren’t as harsh as citrus but can still cause issues for people with acid sensitivity. Pears typically land around 3.5 to 4.6, making them one of the milder options in this middle category. Mangoes range from about 3.4 to 4.8, with sweeter varieties at the higher end. Peaches and nectarines usually sit around 3.4 to 4.1, and their acid levels are strongly influenced by the specific cultivar. Genetic research on peaches has identified specific genes that control how much organic acid accumulates in the fruit, which is why some peach varieties taste noticeably sweeter and less tart than others grown in the same orchard.2PubMed Central. Multi-omics approaches identify a key gene, PpTST1, for organic acid accumulation in peach
Grapes generally fall between 3.5 and 4.5, though table grapes bred for eating tend to be less acidic than wine grapes. Apples cover a wide range depending on variety: a Fuji apple might be around 3.8 to 4.0, while a Granny Smith can dip below 3.3. Cherries sit around 3.2 to 4.0. None of these fruits qualify as truly low-acid, but many people with mild acid sensitivity tolerate them fine, especially when they’re fully ripe.
The High-Acid End of the Spectrum
For context on what “low acid” means, it helps to know what sits at the other extreme. Lemons and limes are the most acidic common fruits, with pH values around 2.0 to 2.6. Cranberries come in around 2.3 to 2.5. Grapefruits typically measure 3.0 to 3.5, and oranges land around 3.0 to 4.0. Pineapple ranges from about 3.2 to 4.0, and its combination of citric acid with the enzyme bromelain makes it particularly aggressive on sensitive tissues.
Tomatoes deserve special mention because they sit in an interesting spot. Botanically a fruit, they measure around 4.0 to 4.6, which is actually less acidic than many fruits people eat without complaint. Yet tomatoes are one of the most commonly reported dietary triggers for acid reflux and bladder irritation. Research into tomato acidity has found that citrate levels in the fruit are largely determined by the activity of a single enzyme, and different tomato varieties can have meaningfully different acid profiles as a result.3PubMed Central. Metabolic Engineering of Tomato Fruit Organic Acid Content Guided by Biochemical Analysis of an Introgression Line Low-acid tomato varieties exist and are popular among gardeners for exactly this reason. But pH alone doesn’t explain why tomatoes bother so many people; they also contain other compounds that may independently irritate the digestive tract.
Why Ripeness Matters More Than You’d Expect
One of the most practical things to understand about fruit acidity is that it changes dramatically as fruit ripens. Almost all fruits become less acidic as they mature, because the organic acids stored in the fruit get broken down and used for energy during the ripening process. A green banana at pH 4.0 becomes a spotted banana at pH 5.2. A rock-hard pear at pH 3.5 becomes a soft, juicy pear at pH 4.5. The difference in acid levels between an underripe and a fully ripe piece of fruit can be larger than the difference between two completely different fruit species.
Temperature during ripening plays a role too. Research on grapes has shown that warmer conditions during the ripening period lead to faster breakdown of malic acid, producing less-acidic fruit.4Journal of Experimental Botany. Metabolic effects of elevated temperature on organic acid degradation in ripening Vitis vinifera fruit This is one reason grapes from hot climates tend to be sweeter and less tart than grapes from cooler regions. The same principle applies broadly: fruit ripened in warmer conditions usually ends up milder than fruit ripened in the cold.
The practical takeaway is that buying ripe fruit and letting it ripen fully at home before eating it is one of the easiest ways to reduce your acid exposure. That bruised, overly soft banana most people throw away is actually the lowest-acid banana in the bunch.
Variety and Growing Conditions Create Wide Ranges
The pH values listed for any fruit are always ranges, and those ranges can be surprisingly wide. A Honeycrisp apple and a Granny Smith apple are both “apples,” but they can differ by nearly a full pH point. The same goes for peaches, grapes, tomatoes, and most other fruits. Breeders have spent decades selecting for sweetness, and one of the main levers they pull is reducing organic acid accumulation. When you buy a sweet variety of any fruit, you’re usually also buying a lower-acid variety.
Growing conditions add another layer of variation. Soil fertility, specifically the availability of potassium, has a measurable effect on fruit acidity. Studies on grapes have found that potassium-containing fertilizers reduce titratable acidity and organic acid content during the later stages of fruit development, while simultaneously increasing sugar levels.5PubMed Central. Effects of Potassium-Containing Fertilizers on Sugar and Organic Acid Metabolism in Grape Fruits More broadly, the nutrient status of the soil a fruit is grown in can alter its overall metabolite profile, including organic acid levels.6PubMed Central. Metabolomics Reveals the Effects of Nitrogen/Phosphorus/Potassium (NPK) Fertilizer Levels on Cucumber Fruit Raised in Different Nutrient Soils
What this means in practice is that two watermelons from different farms, or two batches of bananas from different countries, won’t have identical acidity. The rankings in this article reflect typical ranges, but your specific piece of fruit could fall outside them. If you’re managing a condition that’s sensitive to acid, treat these rankings as a starting point rather than a guarantee.
Acid Reflux and Choosing Gentler Fruits
The most common reason people search for low-acid fruits is acid reflux, or its chronic form, gastroesophageal reflux disease. The logic seems straightforward: acidic foods should make reflux worse, so avoiding them should help. The reality is a bit more complicated. Reflux is primarily a mechanical problem where the valve between your esophagus and stomach doesn’t close properly, allowing stomach acid (which is far more acidic than any fruit) to splash upward. The pH of the food you eat contributes relatively little to the acidity of your stomach contents.
That said, highly acidic foods can irritate an already-inflamed esophagus, and many people with reflux find that citrus fruits, tomatoes, and pineapple reliably trigger symptoms. The issue may not be pH alone; these foods can also relax the lower esophageal sphincter or stimulate additional acid production. Low-acid fruits like bananas, melons, and papaya are commonly recommended for reflux sufferers, and many people report significant improvement when they switch. Bananas in particular have a reputation as a natural antacid, partly because of their mild pH and partly because of their potassium content, which helps buffer acid.
If reflux is your concern, the safest bets are cantaloupe, honeydew, watermelon, bananas, and papaya. Pears and certain apple varieties are often tolerated well too, though individual responses vary. The fruits most likely to cause trouble are citrus of all kinds, pineapple, and tomato-based products.
Dental Erosion and Fruit Acids
Your teeth have a separate and more direct relationship with fruit acidity. Dental enamel starts to dissolve when exposed to solutions below a certain pH, and most fruits are acidic enough to cause at least some erosion with repeated, prolonged contact. Research on fruit juices has found that the critical pH for enamel mineral loss can range from about 5.5 to 7.2, depending on the specific juice composition, meaning that even some moderately acidic fruits can contribute to erosion over time.7PubMed Central. Erosive effect of industrialized fruit juices exposure in enamel and dentine substrates: An in vitro study Grape juice and strawberry juice showed some of the highest critical pH values in that research, meaning they posed erosion risk even at relatively mild acidity levels.
The distinction between eating whole fruit and drinking juice matters here. When you eat a banana or a piece of watermelon, the contact time between the fruit’s acid and your teeth is brief, and your saliva quickly neutralizes the acid. When you sip orange juice or lemonade over the course of an hour, you’re bathing your teeth in acid repeatedly. The fruits that pose the least dental risk are the same ones at the top of the low-acid list: melons, bananas, dates, and papaya. But even with more acidic fruits, eating them at mealtimes rather than snacking on them throughout the day, and rinsing with water afterward, substantially reduces the erosion risk.
Bladder Conditions and Fruit Sensitivity
A less commonly discussed reason to care about fruit acidity involves bladder sensitivity. People with interstitial cystitis or bladder pain syndrome often find that certain foods dramatically worsen their symptoms of urinary urgency, frequency, and pelvic pain. Surveys of patients with these conditions consistently identify citrus fruits and tomatoes among the top dietary triggers.8PubMed. Diet and its role in interstitial cystitis/bladder pain syndrome (IC/BPS) and comorbid conditions A separate study of dietary triggers found the same pattern: citrus fruits and tomatoes were among the items most frequently reported as making symptoms worse.9Female Pelvic Medicine & Reconstructive Surgery. Dietary Consumption Triggers in Interstitial Cystitis/Bladder Pain Syndrome Patients
The mechanism isn’t fully understood. Acidic urine doesn’t seem to be the whole story, since the kidneys regulate urine pH somewhat independently of what you eat. But the compounds in highly acidic fruits may irritate the bladder lining through pathways that go beyond simple pH. For people managing bladder pain syndrome, the low-acid fruits mentioned earlier, particularly bananas, pears, watermelon, and blueberries (which, despite being moderately acidic at around pH 3.1 to 3.4, are often well tolerated by bladder patients for reasons that aren’t entirely clear), tend to be the safest choices. The connection between fruit acidity and bladder symptoms is real enough that dietary modification is now a standard first-line recommendation for managing these conditions.10Journal of the American Dietetic Association. Effect of acidic foods and beverages on the symptoms of interstitial cystitis: A pilot study
Cooking and Processing Change the Picture
Raw fruit and processed fruit don’t always have the same acidity. Cooking fruit generally doesn’t change its pH much, but it can break down some of the volatile acids and alter the perceived sourness. Canned fruit, on the other hand, often sits in syrup or juice that may be more acidic than the fruit itself. Dried fruit concentrates everything, including acids, so dried cranberries or dried apricots pack more acid per bite than their fresh counterparts. Dried dates and dried figs remain low-acid even after drying, since they started so mild.
Fruit juices are consistently more problematic than whole fruit, and not just because of dental contact time. Juicing removes the fiber that slows digestion and concentrates the acid into a liquid that hits the esophagus and stomach all at once. A glass of orange juice delivers the acid of several oranges in a form your body processes much faster. If you’re trying to reduce acid intake, eating whole fruit is almost always better than drinking juice, regardless of the fruit type.
Fermented fruit products like wine and cider introduce additional acids produced during fermentation, making them more acidic than the original fruit. A grape at pH 3.8 becomes wine at pH 3.0 to 3.5. Kombucha made from fruit juice follows the same pattern. For people managing acid-sensitive conditions, fermented fruit products tend to be worse than the raw fruit they came from.
When “Low Acid” Doesn’t Mean “Safe”
It’s worth noting that pH isn’t the only thing in fruit that can cause digestive trouble. Fructose malabsorption affects a sizable portion of the population, and high-fructose fruits like watermelon, mangoes, and pears can cause bloating, gas, and diarrhea regardless of their acidity. Some fruits contain high levels of histamine or are histamine liberators, which can trigger reactions in people with histamine intolerance. And FODMAP content, which relates to certain fermentable carbohydrates, varies independently of acidity. A watermelon is low in acid but high in FODMAPs, which makes it a poor choice for some people with irritable bowel syndrome despite its gentle pH.
Avocados are another example where low acid doesn’t automatically mean easy on the gut. Their high fat content can slow gastric emptying and worsen reflux in some people, even though their pH is close to neutral. The lesson is that acidity is one dimension of fruit tolerance, not the only one. If you’ve eliminated high-acid fruits and still have symptoms, the culprit may be something else entirely.
For anyone trying to build a fruit rotation that minimizes acid exposure while still getting a range of nutrients, a reasonable starting lineup would be ripe bananas, cantaloupe, watermelon, papaya, and ripe pears. Those five cover a good spread of vitamins, minerals, and fiber while keeping pH consistently above 4.5 when fully ripe. From there, adding fruits and watching for individual reactions is a better strategy than memorizing pH charts, since your body’s response to a given fruit depends on far more than its acidity alone.