Watermelon Nutrition Facts

Complete watermelon nutrition breakdown with 30 kcal per 100g, glycemic index, and diet compatibility.

Written by Victura Nutrition TeamReviewed by Victura Editorial ReviewLast updated Jul 19, 2026

30

Calories

0.6g

Protein

7.5g

Carbs

Use caution

Is it healthy?

per 100g · per panel values

Track this food in Victura

Quick answer

A 100g serving of watermelon provides about 30 kcal. Per 100g you get about 7.55g carbs and 0.61g protein. Glycemic index is around 72.

Watermelon is a whole food with approximately 30 calories per 100g, tracked in Victura for macro-aware meal logging.

Calories (100g serving)
30 kcal
Carbs (100g)
7.55g
Protein (100g)
0.61g
Serving reference
100g · 100g serving
Glycemic index
72
Watermelon food photo
Watermelon — real food photo
Watermelon portion size visual
Portion size
Watermelon calories and macros infographic
Calories & macros

Serving calculator

How much did you eat or drinkWatermelon?

30

Calories

0.6g

Protein

7.5g

Carbs

0.1g

Fat

Nutrition facts

per 100g · Source: USDA FoodData Central (seeded Phase 0)

30 kcal

Calories

Protein0.6g
Carbohydrates7.5g
Fat0.1g
Fiber0.4g
Sugar6.2g
Glycemic index72high

Vitamins

  • Vitamin C: 8.1mg
  • Vitamin A: 28mcg RAE

Minerals

  • Potassium: 112mg

Scientific explanation

Research-backed

Watermelon provides approximately 30 kcal per 100g with 0.6g protein, 7.5g carbohydrates, and 0.1g fat. Dietary fiber is 0.4g per 100g. The glycemic index is estimated at 72 (high), meaning glucose rises at a fast rate after consumption. Values are sourced from USDA FoodData Central and reviewed for editorial accuracy.

Community insights

Community insight

Among Victura meal logs, watermelon appears frequently as a portable snack and smoothie ingredient. Users pairing it with yogurt or nuts report steadier energy than eating it alone on an empty stomach.

Pros

  • Watermelon is a whole food with measurable macro nutrients

Cons

  • Portion size still matters for calorie goals

Best time to eat

Pair with protein and fiber for balanced meals.

Good windows

  • With main meals

Consider avoiding

  • Very large portions without activity

Diet compatibility

Weight loss

Use caution

At 30 kcal and 0.4g fiber per 100g, this food is energy-dense - watch portions.

Keto

Use caution

Net carbs ~7.1g per 100g - too high-carb for standard keto.

Diabetic friendly

Use caution

GI 72 with 6.2g sugar - may spike glucose - pair with protein/fat.

Frequently asked questions

Yes — a watermelon is a whole food with measurable nutrients. Healthiness depends on overall diet, portions, and your goals. Estimated GI is 72.

People also ask

  • Is a watermelon healthy?

    Yes — a watermelon is a whole food with measurable nutrients. Healthiness depends on overall diet, portions, and your goals. Estimated GI is 72.

  • Can I eat a watermelon every day?

    Most people can include a watermelon daily as part of a balanced diet, as long as total calories and carbs fit their plan.

  • Are Watermelons good for weight loss?

    At 30 kcal and 0.4g fiber per 100g, this food is energy-dense - watch portions.

  • How many calories are in a watermelon?

    A typical medium serving of watermelon has about 30 calories, while 100g contains about 30 calories (USDA reference).

  • Are Watermelons good before a workout?

    Watermelons can work before activity when you want easy carbs; pair a watermelon with protein if your session is long.

  • Are Watermelons high in sugar?

    Watermelons contain about 6.2g sugar per 100g — mostly natural sugars when whole.

  • Is watermelon good for weight loss?

    At 30 kcal and 0.4g fiber per 100g, this food is energy-dense - watch portions.

  • Is watermelon keto-friendly?

    Net carbs ~7.1g per 100g - too high-carb for standard keto.

  • What is the glycemic index of watermelon?

    Estimated GI is 72. Pair with protein or fat to blunt glucose response.

  • Is watermelon safe for people with diabetes?

    GI 72 with 6.2g sugar - may spike glucose - pair with protein/fat.

  • How many calories does watermelon have?

    Watermelon contains 30 calories (kcal) per 100g. Because it is over 91% water, it has a very low calorie density, allowing you to eat a larger portion for relatively few calories.

How we review this guide

Written by
Victura Nutrition Team
Reviewed by
Victura Editorial Review
Reference sources
4
Last updated
Jul 19, 2026

Revision & correction policy

References

  1. USDA FoodData Central(usda)
  2. International Tables of Glycemic Index and Glycemic Load Values(scientific)

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