Cantaloupe is a high-potassium fruit. One cup of cubed cantaloupe delivers about 427 milligrams of potassium, which covers roughly 10% of the daily value. Clinical nutritionists classify any food with more than 200 milligrams of potassium per serving as “high potassium,” and cantaloupe clears that bar easily.
How Much Potassium Is in Cantaloupe
The exact amount depends on how you measure it. Per 100 grams of raw cantaloupe, you get about 267 milligrams of potassium. A standard cup of cubed cantaloupe weighs around 160 grams and contains 427 milligrams. The FDA’s reference serving size for nutrition labels is one-quarter of a medium melon (about 134 grams), which provides 240 milligrams and 12% of the daily value.
Most people eat more than a quarter of a melon in one sitting, so a realistic portion often supplies 400+ milligrams. That single cup gets you roughly a tenth of the way to the recommended 4,700 milligrams per day for adults.
How Cantaloupe Compares to Other Fruits
Bananas get most of the credit as a potassium source, but cantaloupe isn’t far behind. Here’s how they line up per one-cup serving:
- Banana: 537 mg
- Cantaloupe: 427 mg
- Honeydew melon: 388 mg
Cantaloupe delivers about 80% of the potassium in a cup of banana slices. Where it has an edge is calorie density. A cup of cantaloupe runs about 54 calories compared to roughly 134 for a cup of banana, so you’re getting more potassium per calorie. If you’re looking to boost your intake without adding much energy to your diet, cantaloupe is one of the more efficient choices in the fruit aisle.
Why Potassium Matters
Potassium plays a central role in blood pressure regulation. In the kidneys, potassium influences how much sodium your body reabsorbs versus how much it flushes out through urine. When you eat more potassium, your kidneys dial down sodium reabsorption in the filtering tubes of the kidney. The result: more sodium leaves your body, and blood pressure drops. When potassium intake is low, the opposite happens. Your kidneys hold onto more sodium, which pulls water into the bloodstream and raises pressure.
This relationship is well established enough that the American Heart Association lists cantaloupe among common potassium-rich foods relevant to blood pressure management. Beyond blood pressure, potassium helps maintain normal muscle contractions, nerve signaling, and fluid balance throughout the body.
Other Nutrients That Come Along for the Ride
Cantaloupe isn’t just a potassium vehicle. That same one-cup serving provides about 59 milligrams of vitamin C, roughly 65% of the daily value. It also has a high water content, which, combined with its natural fiber, makes it useful for hydration and helps moderate blood sugar response despite its sweetness. The combination of water, potassium, and natural sugars makes cantaloupe a practical post-workout or hot-weather snack, replacing some of what you lose through sweat without needing a sports drink.
If You’re Watching Your Potassium Intake
For most people, getting more potassium is a good thing. The average American falls well short of the daily recommendation. But if you have chronic kidney disease or are on a potassium-restricted diet, cantaloupe lands on the “higher potassium” list that your care team will flag. The National Institute of Diabetes and Digestive and Kidney Diseases advises people with CKD to choose lower-potassium fruits and keep servings of higher-potassium options very small, like a few bites rather than a full bowl.
If your kidneys can’t efficiently clear excess potassium from your blood, even a cup of cantaloupe could push your levels higher than intended. People on potassium-restricted diets typically aim to stay under a daily cap set by their nephrologist, and a single cup of cantaloupe could represent a significant chunk of that limit. Lower-potassium fruit alternatives include apples, grapes, blueberries, and canned pears.