Calories in watermelon

Raw. 30 kcal (126 kJ) per 100 g. Choose a portion below and every figure on the page updates.

Watermelon is about 91% water, which is why 100 g of the raw flesh carries only 30 kcal (126 kJ). Nearly all of that energy comes from natural sugars, around 6 g per 100 g, with almost no fat or protein. It is a modest source of vitamin C and vitamin A, and a large wedge is filling for its energy cost.

Where the energy comes from

Share of total energy contributed by each macronutrient, using the standard 4/4/9 kcal per gram factors:

Things worth knowing

• A wedge cut as one-sixteenth of a melon weighs about 286 g and provides roughly 86 kcal (359 kJ), so a typical slice is nearly three times a 100 g serving.
• One cup of diced watermelon (152 g) has about 46 kcal (191 kJ) and 9.4 g of sugar; ten melon balls (122 g) come to about 37 kcal (153 kJ).
• Watermelon has a high glycaemic index, but because it is mostly water, the glycaemic load of a normal serving is low.
• It is slightly lower in energy than other melons: cantaloupe has 34 kcal and honeydew 36 kcal per 100 g, and cantaloupe has far more vitamin C and vitamin A.

Converting these figures

One 1 cup, diced of watermelon is 46 kcal, which is 191 kJ. To convert any other figure, divide kilojoules by 4.184 for calories, or use the converter on the home page.

It takes 797 g of watermelon to reach 1,000 kJ (239 kcal). See how that compares with other foods on the 1000 kJ to calories page.