Watermelon contains approximately 7.5 to 8 grams of carbohydrates per 100 grams (about 3.5 ounces). More specifically:

• About 7.6 grams of carbs per 100 grams of raw watermelon, with 6.2 grams being sugars and 0.4 grams fiber

• One cup of diced watermelon (152 grams) contains roughly 11.5 to 12 grams of total carbohydrates, including about 0.5 to 0.6 grams of fiber, resulting in about 11 grams of net carbs

• A half-cup serving of diced watermelon has about 5.5 grams of carbs

The carbs in watermelon are mostly simple sugars like glucose, fructose, and sucrose. Due to its high water content (over 90%), watermelon is relatively low in carbs compared to many other fruits

. In summary, watermelon has about 7.5–8 grams of carbs per 100 grams, or about 11–12 grams per cup of diced watermelon.