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Calories in watermelon

A usual serving, 1 slice (300 g), has about 90 kcal; 100 g ≈ 30 kcal.

Serving kcal Protein Fat Carbs Fibre
100 g 30 0.6 g 0.1 g 7.1 g 0.4 g
1 slice 300 g 90 1.8 g 0.3 g 21 g 1.2 g

Source: fdc.nal.usda.gov · Confidence: high · Updated:

Calories per serving

Serving kcal Protein Fat Carbs
1 slice 300 g 90 1.8 g 0.3 g 21 g
2 slices 600 g 180 3.6 g 0.6 g 43 g

How it fits into a day

A slice of watermelon of about 300 g without the rind has about 90 kcal, because it's over 90 % water. In summer it's one of the best snacks: big, sweet and light. Most of the energy, about 90%, comes from carbs.

A usual serving (1 slice) is about 5% of a 2,000 kcal day. How much do you need a day? Work it out in the calorie calculator.

Lighter options

  • Cold watermelon is a good dessert after a barbecue.
  • Even two slices are about 180 kcal, less than a piece of custard slice (about 300 kcal).

Frequently asked questions

How many calories are in a slice of watermelon?

About 90 kcal in 300 g, with 1.8 g protein, 0.3 g fat and 21 g carbs.

How many calories are in 100 g of watermelon?

About 30 kcal per 100 g: 0.6 g protein, 0.1 g fat and 7.1 g carbs.

Does watermelon have a lot of sugar?

Not much: about 7.1 g carbs per 100 g. A 300 g slice has about 21 g.

See also

Full table: Fruit and nuts