A whole watermelon typically contains about 1,360 calories. This estimate is based on a watermelon measuring approximately 15 inches long by 7.5 inches in diameter, according to the USDA Food Data Central
. The calorie content can vary depending on the size and variety of the watermelon, but for a medium to large-sized watermelon, 1,360 calories is a widely accepted average. Most of these calories come from carbohydrates, primarily natural sugars like sucrose, fructose, and glucose, which give watermelon its sweet taste
. In summary:
- Whole watermelon (about 15" x 7.5"): ~1,360 calories
- One cup of diced watermelon: ~46 calories
- One slice (1/16th of a whole melon): ~86 calories
This makes watermelon a low-calorie fruit option despite its size and sweetness, largely due to its high water content (over 90%)
