QUICK ANSWER
How many calories are in watermelon?
Raw watermelon flesh provides 30 kcal per 100 g. Scale from the edible portion and keep other states separate.
30 kcal / 100 gNutrition values describe a reference food state, not every individual item. Variety, water content, preparation and portion weight can change the estimate.
THE NUMBERS
Watermelon nutrition facts per 100 g
The values below use the reference state shown at the top of this page. Keeping one gram basis makes it easier to compare foods before translating the values to the portion you actually ate.
- Calories
- 30 kcal
- Protein
- 0.61 g
- Carbohydrate
- 7.55 g
- Fat
- 0.15 g
- Fibre
- 0.4 g
- Potassium
- 112 mg
- Vitamin C
- 8.1 mg
- Vitamin A
- 28 µg RAE
Source: USDA FoodData Central SR Legacy record 167765. Values may be rounded for readability.
SERVING SIZE
Calories by portion and serving weight
Words such as “small,” “medium,” “half” and “one piece” are convenient but imprecise. Grams make the estimate reproducible, particularly when natural foods vary in size.
MACROS
Carbohydrate, protein and fat explained
Protein
0.61 g per 100 g. From Watermelon, raw.
Carbohydrate
7.55 g per 100 g. From Watermelon, raw.
Fat
0.15 g per 100 g. From Watermelon, raw.
MORE THAN CALORIES
Fibre, vitamins and minerals
One food does not need to provide every nutrient. These are the characteristics most useful for understanding where watermelon fits in a varied eating pattern.
Potassium
112 mg per 100 g in the selected USDA record.
Vitamin C
8.1 mg per 100 g in the selected USDA record.
Vitamin A
28 µg RAE per 100 g in the selected USDA record.
Magnesium
10 mg per 100 g in the selected USDA record.
FOOD STATE MATTERS
How preparation changes the nutrition estimate
A reliable calorie entry should describe the food you actually ate—not merely a food with a similar name.
Raw edible flesh
Selected generic reference.
Seedless flesh
A seedless flesh-only record is mapped separately.
Rind
Not part of this edible-flesh reference.
Juice or fruit salad
Use the complete product or recipe and include other ingredients.
PRACTICAL CONTEXT
How watermelon can fit different goals
There is no universal “good” or “bad” food. Portion, frequency, the rest of the meal, preferences and individual health needs all matter.
Portion math
At 30 kcal per 100 g, the 122 g example is 36.6 kcal.
Fibre check
The selected record lists 0.4 g fibre per 100 g.
Protein check
The selected record lists 0.61 g protein per 100 g.
Best logging move
Weigh edible flesh only and exclude rind from this entry.
QUALITY & SAFETY
How to choose, store and prepare it
Store
Keep whole watermelon according to current produce guidance.
After opening or cutting
Keep cut watermelon covered and chilled.
Prepare
Rinse the rind before cutting and use a clean knife and board.
Safety boundary
Discard mouldy or fermented-spoiled fruit; the nutrient record does not establish storage duration.
PHOTO LOGGING
How to log watermelon more accurately
A food photo can suggest the ingredient, but it cannot always reveal exact weight, hidden oil or preparation details. These checks turn an image guess into a better estimate.
- 01
Match the exact reference state: Watermelon, raw.
- 02
Use edible grams. Calories are scaled from the selected per-100-g record; named portion weights come from the same local USDA record.
- 03
Log oil, sauce, sweetener, salt and recipe ingredients separately.
- 04
Use a separate record when preparation changes the food state.
COMMON QUESTIONS
Watermelon calorie and nutrition questions
How many calories are in 100 g of watermelon?
30 kcal in the selected Watermelon, raw record.
How much fibre is in watermelon?
0.4 g per 100 g in the selected record.
Which watermelon state does this page use?
Watermelon, raw. Preparation and edible state are part of the answer.
Does this page count watermelon rind?
No. The production reference is raw edible flesh; rind-only data is not used for the generic page.
How are the portion calories calculated?
Each portion is scaled from 30 kcal per 100 g. Named portion weights come from the selected source record.
KEEP EXPLORING
Related food guides
SOURCES & METHOD
Where these numbers come from
Watermelon, raw, per 100 g edible portion. Numeric nutrition and named-portion claims use the nutrition-reviewed local USDA record. Preparation notes cover the common USDA forms of this food. The nutrient record does not establish storage duration, clinical advice or food-safety limits; use package directions and current authoritative guidance where relevant.
Open USDA FoodData Central SR Legacy record 167765 ↗Page reviewed 26 August 2026. We show the food state, gram basis and source record so readers can check the estimate instead of treating one number as universally exact.