A whole medium cantaloupe contains roughly 190 calories. One cup of cubed cantaloupe, the standard serving size, has just 54 calories, making it one of the lowest-calorie fruits you can eat. That light calorie count comes from the fruit being about 90% water by weight.
Calories by Serving Size
How you cut and measure cantaloupe changes the calorie count slightly, since cubes and melon balls pack differently into a cup. Here’s what to expect across common portions:
- 1 cup of cubes (160g): 54 calories
- 1 cup of melon balls (177g): 60 calories
- 1 wedge (1/8 of a medium melon, about 69g): 23 calories
- Half a medium cantaloupe: roughly 95 calories
- One whole medium cantaloupe (about 552g of flesh): roughly 190 calories
For context, a medium banana has about 105 calories and a cup of grapes around 100. Cantaloupe gives you a large, satisfying volume of food for very few calories, which is why it shows up so often in weight-management meal plans.
What Else Is in a Cup of Cantaloupe
Beyond the low calorie count, a single cup of cubed cantaloupe delivers a surprisingly strong nutritional profile. You get 1.34 grams of protein, 1.44 grams of fiber, and 12.6 grams of natural sugar. Fat is negligible, at about 0.3 grams.
The micronutrients are where cantaloupe really stands out. One cup provides about 59 milligrams of vitamin C, which covers most of an adult’s daily needs. It also contains over 3,200 micrograms of beta-carotene, the pigment your body converts into vitamin A. That orange color isn’t just for show: cantaloupe is one of the richest fruit sources of beta-carotene available. You’ll also get 427 milligrams of potassium per cup, comparable to what you’d find in a small banana.
Why Cantaloupe Is So Low in Calories
The simple explanation is water. Cantaloupe is about 90% water by weight, similar to watermelon and honeydew. That high water content means you’re getting a lot of volume and hydration without much caloric density. A full cup of cantaloupe cubes weighs 160 grams but delivers fewer calories than a single tablespoon of peanut butter.
This also makes cantaloupe useful if you’re trying to eat more food without increasing your calorie intake. Because your stomach responds to volume, water-rich fruits like cantaloupe can help you feel full on very few calories.
Sugar and Blood Sugar Impact
The 12.6 grams of sugar in a cup of cantaloupe might look concerning if you’re watching your carbohydrate intake, but the fruit’s glycemic index is 54, which falls in the low-to-moderate range. That means it raises blood sugar more gradually than high-glycemic foods like white bread or white rice. The fiber and water content slow down sugar absorption, so the effect on blood sugar is gentler than the raw sugar number might suggest.
For people managing diabetes or prediabetes, a single cup of cantaloupe is a reasonable portion. Pairing it with a small amount of protein or fat, like cottage cheese or a handful of nuts, can further blunt any blood sugar spike.
How Cantaloupe Compares to Other Melons
All melons are relatively low in calories thanks to their high water content, but there are small differences worth noting. Watermelon runs about 46 calories per cup, making it slightly lighter than cantaloupe’s 54. Honeydew comes in around 60 calories per cup. Where cantaloupe pulls ahead is in beta-carotene and vitamin C content. Watermelon and honeydew have paler flesh and deliver far less of both nutrients. If you’re choosing purely on calories, the differences are minor. If you want the most nutrition per calorie, cantaloupe wins easily among common melons.
Getting the Most Out of Cantaloupe
Cantaloupe is best eaten fresh and ripe, when its sugar content peaks and the texture is soft but not mushy. A ripe cantaloupe will smell sweet at the stem end and yield slightly when you press it. Once cut, store it in the refrigerator and eat it within three to four days, since the flesh dries out and loses flavor quickly.
Freezing cubed cantaloupe works well for smoothies, where the frozen pieces add sweetness, volume, and a creamy texture without significantly increasing the calorie count of your drink. Frozen cantaloupe retains most of its vitamin C and beta-carotene, so you’re not sacrificing much nutritionally.