Grapefruit is actually a hybrid of the pomelo and the sweet orange, which means these two fruits are relatives, not twins. The pomelo (Citrus maxima) is one of the original, non-hybrid citrus species, while grapefruit (Citrus x paradisi) is its descendant, a cross that likely occurred naturally in Barbados sometime in the 1700s. Despite sharing a family tree, the two fruits differ noticeably in size, taste, texture, and even how they interact with medications.
Size and Appearance
The pomelo is the largest of all citrus fruits, often reaching the size of a volleyball or even a basketball. A single pomelo can weigh anywhere from two to four pounds, though some specimens grow even larger. The rind is extremely thick, sometimes over an inch deep, and ranges from pale green to yellow. Beneath that rind sits a spongy white pith layer that’s much thicker than what you’d find on any other citrus fruit.
Grapefruit is considerably smaller, roughly the size of a large orange. Its skin is thinner and tighter against the flesh, typically yellow to pinkish-red depending on the variety. The flesh color ranges from pale yellow (white grapefruit) to deep ruby red, while pomelo flesh tends to be pale yellow, pink, or sometimes a light red. The segments inside a pomelo are also larger and more clearly separated from each other, with tougher membranes between them.
Taste and Acidity
This is where most people notice the biggest difference. Grapefruit is more acidic, with a pH around 3.2 to 3.3, giving it that signature tart, bitter punch. Pomelo is noticeably milder. Some pomelo varieties reach a pH as high as 4.75, which makes them taste sweeter and gentler, closer to a mild orange than a sharp grapefruit. The bitterness that defines grapefruit is either absent or very faint in most pomelo varieties.
Pomelo flesh also has a drier, firmer texture. The juice vesicles (the tiny sacs inside each segment) hold together more and burst less easily, so eating a pomelo feels less juicy and more like chewing distinct, slightly chewy pulp. Grapefruit segments are softer, wetter, and release juice much more readily. If you’ve ever been surprised by how “dry” a pomelo seems compared to other citrus, that’s normal and not a sign of poor quality.
Peeling and Eating
The thick rind on a pomelo means you can’t just slice it in half and go at it with a spoon the way many people eat grapefruit. Instead, the standard approach is to score the rind in sections, peel it away, then pull apart the large segments by hand. Most people also peel off the tough membrane surrounding each segment before eating, since it can be chewy and bitter. What you’re left with are clean chunks of flesh that work well in salads or as a snack.
Grapefruit is more versatile in how you can eat it. Cutting it in half and scooping out the flesh with a serrated spoon remains the classic method. You can also supreme it, which means cutting away the peel and pith with a knife, then slicing between the membranes to release clean, membrane-free segments. Both fruits work well in salads, paired with shrimp, avocado, or bitter greens, but grapefruit’s juicier texture makes it a better fit for fresh-squeezed juice or cocktails. Pomelo’s firmer flesh holds its shape better in dishes where you want distinct pieces that won’t fall apart.
Nutritional Differences
Both fruits are low in calories and high in vitamin C, but the proportions shift because of the size difference. A full cup of pomelo sections has roughly 70 to 75 calories, while the same amount of grapefruit comes in around 75 to 80. The difference is negligible. Both provide a solid dose of potassium, fiber, and antioxidants. Pink and red grapefruit varieties contain more lycopene and beta-carotene than pale pomelo varieties, which gives them a slight edge in those specific antioxidants.
The higher acidity of grapefruit is worth noting if you deal with acid reflux or sensitive teeth. Pomelo’s lower acidity makes it easier on the stomach and tooth enamel for people who find grapefruit too harsh.
Drug Interactions
Grapefruit is well known for interfering with dozens of medications, including certain cholesterol-lowering drugs, blood pressure medications, and anti-anxiety drugs. It contains high levels of compounds called furanocoumarins, which block an enzyme in your gut that normally helps break down these medications. When that enzyme is blocked, too much of the drug enters your bloodstream, potentially causing dangerous side effects.
Pomelo contains some of the same compounds, since grapefruit inherited them from the pomelo side of its family tree. Research has confirmed that pomelo juice can affect the absorption of certain drugs, including the organ transplant drug cyclosporine. However, the effect is generally less potent than with grapefruit. Grapefruit juice’s combination of furanocoumarins is considered uniquely strong in its ability to inhibit that gut enzyme, and other citrus juices, including pomelo, have not been shown to precipitate the same severity of interactions. Still, if you take any medication that carries a grapefruit warning, it’s reasonable to treat pomelo with the same caution until you’ve checked with your pharmacist.
Availability and Cost
Grapefruit is widely available year-round in most Western grocery stores, with peak season running from November through June. It’s relatively inexpensive and stocked alongside other everyday citrus. Pomelo is harder to find in many parts of North America and Europe. You’re most likely to spot it in Asian grocery stores, where it’s a staple fruit, or in well-stocked supermarkets during the winter months. Pomelos tend to cost more per fruit, partly because of their size and partly because they’re imported from Southeast Asia, China, or sometimes grown in California and Florida in smaller quantities.
In many East and Southeast Asian cultures, pomelo holds cultural significance and is commonly eaten during the Mid-Autumn Festival and Lunar New Year. Grapefruit, by contrast, is more of a Western breakfast staple and juice fruit. If you’ve only ever had grapefruit and find it too bitter, pomelo is worth seeking out. Its sweeter, mellower flavor is a genuine departure, not just a slightly different version of the same thing.