How Many Carbs In Watermelon

How Many Carbs In Watermelon
Doctor is checking a patient

Many readers are interested in the following topic: Is Watermelon Keto? Carbs In Watermelon. We are happy to note, that our authors have already studied the modern research about the topic you are interested in. Based on the information provided in the latest medical digests, modern research and surveys, we provide extensive answer. Keep reading to find out more.

Is watermelon low carb, then? Yes! Among the main keto diet approaches, watermelon fits best on a low carb plan.

Carbs in Watermelons

The favorite choice for the term “Watermelons” is 1 cup of diced Watermelon which has about 11 grams of carbohydrate. The total carbohyrate, sugar, fiber and estimated net carbs (non-fiber carbs) for a variety of types and serving sizes of Watermelons is shown below.

View other nutritional values (such as Calories or Fats) using the filter below:

Popular Watermelon Serving Sizes

Net Carbs(g) Sugar(g) Fiber(g) Total Carbs(g)

Other Types of Melon

(1 cup serving) Net Carbs(g) Sugar(g) Fiber(g) Total Carbs(g)

Other Popular Fruits

(1 piece serving) Net Carbs(g) Sugar(g) Fiber(g) Total Carbs(g)
Food Search

How Many Carbs In Watermelon

Popular Pick:

Nutrition Facts

Serving Size 1 cup, diced

Amount Per Serving
% Daily Values*
Saturated Fat
Trans Fat
Polyunsaturated Fat
Monounsaturated Fat
Total Carbohydrate
Dietary Fiber

* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Other Recently Popular Watermelons:

How Many Carbs In Watermelon Del Monte Bubble Fruit Sour Apple Watermelon
How Many Carbs In Watermelon Nutty & Fruity Dried Watermelon
How Many Carbs In Watermelon Taylor Farms Watermelon Crunch Chopped Kit
How Many Carbs In Watermelon Sol Mini Watermelon
How Many Carbs In Watermelon Jamba Juice Watermelon Hydration Bowl
How Many Carbs In Watermelon Pure Heart Seedless Watermelon
How Many Carbs In Watermelon Hometown Buffet Watermelon
How Many Carbs In Watermelon Longhorn Steakhouse Fresh Fruit – Watermelon (Kid’s)
How Many Carbs In Watermelon Uno Chicago Grill Watermelon
How Many Carbs In Watermelon Wegmans Watermelon

Please note that some foods may not be suitable for some people and you are urged to seek the advice of a physician before beginning any weight loss effort or diet regimen. Although the information provided on this site is presented in good faith and believed to be correct, FatSecret makes no representations or warranties as to its completeness or accuracy and all information, including nutritional values, is used by you at your own risk. All trademarks, copyright and other forms of intellectual property are property of their respective owners.

Is Watermelon Keto? Carbs In Watermelon

Is watermelon keto? Are there carbs in watermelon, even? Get the answers here, along with ways to get the flavor of sweet watermelon on keto.

Single whole watermelon

Opt-in image

Free Printable: Low Carb & Keto Food List

This post may contain affiliate links, which help keep this content free. (Full disclosure)

Table Of Contents show

  • Is Watermelon Keto Friendly?
  • Get Carb Counts & Track Macros With The Easy Keto App
  • How Many Carbs In Watermelon?
  • Keto Watermelon Substitutes
  • Conclusion: Can You Eat Watermelon On Keto?

On keto, not all food is all you can eat… some choices need a closer look at carb counts, especially carbs in fruit! So, is watermelon keto friendly enough to make the cut? How many carbs in watermelon? We’ll go over the surprising answer here, plus various ways to enjoy the sweet flavor of watermelon on keto.

New to counting carbs or keto? Learn the keto diet basics here and grab my printable keto cheat sheet system to make it easy.

Is Watermelon Keto Friendly?

Sort of. Watermelon might be keto in small amounts, but it’s difficult to fit regularly into this way of eating. Carbs in watermelon are generally too high to enjoy every day.

Is watermelon low carb, then? Yes! Among the main keto diet approaches, watermelon fits best on a low carb plan.

Get Carb Counts & Track Macros With The Easy Keto App

Track this food and thousands of others (plus recipes!) in the app.

Is watermelon keto? This cubed watermelon in a bowl may be keto in small amounts.

How Many Carbs In Watermelon?

Does watermelon have carbs? It does… How many carbs does watermelon have, exactly? Watermelon carb count for a 1-cup serving clocks in at 11.7 total carbs [*].

How many net carbs in watermelon, though? It has a very small amount of fiber, so net carbs for the same serving add up to 11.1 grams.

Serving Size Total Carbs Net Carbs
1 cup 11.7g 11.1g

How many carbs in a slice of watermelon?

Can you have watermelon on keto if it’s sliced? It would be tough. In one small piece, carbs in a watermelon slice clock in at 16.5 grams total carbs and 15.6 grams net carbs.

Serving Size Total Carbs Net Carbs
1 small slice 16.5g 15.6g

How many carbs in one watermelon cube (or ball)?

Is watermelon high in carbs if you have a single cube? Not so much: Just one cube or ball of melon has 1.13 grams total carbs and 1.07 grams net carbs. Smaller servings mean fewer carbs!

Serving Size Total Carbs Net Carbs
1 cube or ball 1.13g 1.07g

Keto Watermelon Substitutes

If you decide that watermelon carbs per cup or slice are too high, consider these alternatives:

  • Small amounts of melon: Save it for special occasions and only have a little bit, such as a small slice of this watermelon fruit pizza.
  • Lower carb keto fruits: If you just need fruity flavor, try a different keto fruit instead.
  • Watermelon electrolytes: Cut carbs in watermelon but keep the flavor, all while preventing keto flu.
  • Watermelon extract: If you need just a hint of watermelon on keto, try a dash of this.
  • Keto sweeteners: Watermelon isn’t the only way to taste something sweet! Swap in one of these alternatives instead to cut more carbs.

Conclusion: Can You Eat Watermelon On Keto?

Watermelon and keto don’t work together well, since watermelon carbs are too high to enjoy regularly. If you do have watermelon, keep portions very small or try more keto friendly substitutes instead.

Watermelon Nutrition Facts and Health Benefits

Debra Manzella, MS, RN, is a corporate clinical educator at Catholic Health System in New York with extensive experience in diabetes care.

Updated on March 29, 2022
Medically reviewed

Verywell Fit articles are reviewed by board-certified physicians and nutrition and exercise healthcare professionals. Medical Reviewers confirm the content is thorough and accurate, reflecting the latest evidence-based research. Content is reviewed before publication and upon substantial updates. Learn more.

Mia Syn, MS, RDN is a registered dietitian nutritionist with a master of science in human nutrition. She is also the host of Good Food Friday on ABC News 4.

Watermelon annotation

Table of Contents
Table of Contents

Watermelon, one of summer’s most iconic fruits, is low in calories and rich in water. It’s also an excellent source of vitamins A and C and lycopene while being less acidic than citrus fruits and tomatoes—other well-known providers of lycopene and vitamin C.

Watermelon Nutrition Facts

One cup of diced watermelon (152g) provides 46 calories, 0.9g of protein, 11.5g of carbohydrates, and 0.2g of fat. Watermelon is an excellent source of lycopene and vitamins A and C. The following nutrition information is provided by the USDA.


The carbohydrates in watermelon are mostly sugars, with only a little fiber. Half of the sugar is fructose, one quarter is glucose, and less than one quarter is sucrose, with other sugars making up minor fractions. If you are counting carbohydrates, it’s best to measure watermelon carefully.

  • 1 cup diced watermelon (152g): 0.6 grams fiber, 9.4 grams sugars, 11.5 grams total carbohydrates, 10.9 grams net carbohydrates
  • 1 medium-sized wedge of watermelon (286g): 1.1 grams fiber, 17.7 grams sugars, 21.6 grams total carbohydrates, 21 grams net carbohydrates

Watermelon has a glycemic index (GI) of 76. This means it could give you a faster rise in blood sugar than foods with a lower GI. However, when considering glycemic load (which takes into account how much you eat per serving), a half cup of chopped watermelon is 4, which is considered low.


You will get almost no fat in watermelon, making it similar to other melons such as cantaloupe or honeydew. The fat that is present is mainly polyunsaturated (0.076 grams), with smaller amounts of monounsaturated (0.056 grams) and saturated (0.024 grams) fatty acids.

For dietary tracking purposes, you can consider watermelon a non-fat food. The seeds (yes, they are edible) are a source of omega-3 fatty acids.


Watermelon has only a little protein, with just under 1 gram per cup. Interestingly, some companies produce watermelon seed protein by sprouting and shelling the seeds.

You won’t be able to get that level of protein from fresh seeds, however, because the shell of the seed prevents digesting the protein inside.

Vitamins and Minerals

A fully ripe red watermelon contains higher levels of nutrients than less ripe watermelon. A single serving of watermelon is a good source of vitamin C and vitamin A, providing a significant percentage of your daily requirement for each.

Vitamin C aids in wound healing and may have anti-aging and immune-boosting properties, whereas vitamin A is important for eye health. A one-cup serving of watermelon also provides about 7% of your daily needs of copper and pantothenic acid, 5% of biotin, and 4% of vitamins B1 and B6.


One cup of diced or balled watermelon contains around 46 calories. If you prefer to eat it wedged instead, a wedge that is around one-sixteenth of the melon (286 grams) contains almost double that amount or approximately 86 calories.


Watermelon is low in calories and contains almost no fat. While providing many valuable nutrients—such as vitamins A and C—it is somewhat high in sugar, so people who are monitoring their sugar intake may be best served by eating this fruit in moderation.

Health Benefits

Beyond being a sweet summer treat, watermelon can boost your health in several ways.

Fights Dehydration

Aptly named, watermelon is almost 92% water, making it a very hydrating food choice. If you or your children struggle to drink enough water—especially on hot summer days—try a few servings of watermelon. You’ll get extra micronutrients along with your hydration.

Reduces Blood Pressure

Watermelon has antioxidant power because it is an excellent source of lycopene, a carotenoid phytonutrient that research has shown may help reduce or prevent high blood pressure. Tomatoes are well known as a source of lycopene, but a fully ripe watermelon has even more lycopene than a tomato.

Reduces Risk of Infections and Cancer

Other antioxidants in watermelon include flavonoids, carotenoids, and triterpenoids. Antioxidants such as these assist in cell repair and may help lower your risk of infections and some cancers.

Contributes to Weight Loss

In a small study of overweight adults, those who consumed watermelon instead of low-fat cookies felt more full. They also showed reductions in body weight, body mass index, waist-to-hip ratio, and blood pressure.

Body Mass Index (BMI) is a dated, biased measure that doesn’t account for several factors, such as body composition, ethnicity, race, gender, and age.

Despite being a flawed measure, BMI is widely used today in the medical community because it is an inexpensive and quick method for analyzing potential health status and outcomes.

Helps Ease Muscle Fatigue

The amino acid citrulline is present in significant amounts in watermelon. You can find capsules of concentrated citrulline sold as a nutritional supplement for sports performance. The benefits of citrulline are not conclusive, although some studies show that citrulline supplements might reduce the feeling of fatigue during exercise.


Watermelon food allergies are rare. However, if you have hay fever or are allergic to ragweed pollen or grasses, you may have a food-pollen allergy syndrome which may lead to a cross-reaction to the proteins in watermelon that are similar to the pollen.

This reaction might feel a tingling or itch in your mouth after eating watermelon. In rare cases, this can be more serious and trigger throat swelling or anaphylaxis.

Adverse Effects

Watermelon poses few risks, with research deeming this fruit “nontoxic without known side effects.” However, because it does contain sugar, people with diabetes may need to be cautious when eating watermelon to avoid blood sugar spikes.


Watermelon comes in dozens of varieties and cultivars. These can be grouped by size (“icebox” or smaller varieties vs. larger “picnic” types), the color of their flesh (pink, yellow, or orange), and whether they contain seeds or are seedless.

Watermelon has a thick rind that can be solid green, green-striped, or mottled with white. Melons can be round or oval in shape and typically weigh between 6 pounds and 29 pounds. The crisp flesh is mostly pinkish-red, although golden-fleshed varieties are becoming more popular.

Native to tropical Africa, watermelons are grown commercially in the U.S. in areas such as Texas, Florida, Georgia, and California, where the weather is warm and conducive to a long growing season.

When It’s Best

Watermelon is in season in summer in the U.S. A ripe watermelon is one that feels heavy for its size. The outside should be firm and free of nicks or dents. The ground spot—where the melon was resting on the ground—should be a creamy yellow color as opposed to white.

Storage and Food Safety

Fresh, uncut watermelon can be stored at room temperature. Heat will cause the flesh to dry out, so if it’s hot outside, watermelon should be kept in a cool place like a cellar or the refrigerator.

Uncut watermelon can be stored in the refrigerator for two to three weeks. Once you cut it, you can keep it in the fridge for up to five days if it is in a closed container or sealed plastic bag. You can also freeze watermelon that’s been cut up into chunks.

How to Prepare

Go beyond typical slices and add watermelon to smoothies, salsa, and salads (both fruit salads and veggie-heavy ones, too). Its subtle sweetness also pairs well with cheese, nuts, and other protein sources.

You can also grill or freeze watermelon for a tasty dessert. Place cold or frozen watermelon chunks into water or seltzer for a tasty, low-calorie beverage.

The whole watermelon is edible. You can eat the seeds as well as the rind, the latter of which is sometimes turned into watermelon rind flour or served after being stir-fried, stewed, or pickled. (The white seeds in a seedless watermelon are actually empty seed coats that did not fully mature.)

16 Sources

Verywell Fit uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.

  1. Watermelon, raw. U.S. Department of Agriculture. FoodData Central.
  2. Oregon State University. Glycemic index and glycemic load.
  3. Kaur P, Gupta D, Paul D. Analysis of fixed oils of few wonder seeds. J Agroecology Natural Res Managem. 2015;2(2):105-9.
  4. Penn State. Are watermelon seeds bad for you?
  5. Ilahy R, Tlili I, Siddiqui M, Hdider C, Salvatore Lenucci M. Inside and beyond color: comparative overview of functional quality of tomato and watermelon fruits. Front Plant Sci. 2019;10:769. doi:10.3389/fpls.2019.00769
  6. National Institutes of Health Office of Dietary Supplements. Vitamin C: Fact sheet for health professionals.
  7. National Institutes of Health Office of Dietary Supplements. Vitamin A: Fact sheet for health professionals.
  8. Naz A, Butt M, Sultan M. Watermelon lycopene and allied health claims. EXCLI J. 2014;13:650-60.
  9. Figueroa A, Sanchez-Gonzalez MA, Wong A, Arjmandi BH. Watermelon extract supplementation reduces ankle blood pressure and carotid augmentation index in obese adults with prehypertension or hypertension. Am J Hypertens. 2012;25(6):640-3. doi:10.1038/ajh.2012.20
  10. Vance TM, Su J, Fontham ET, Koo SI, Chun OK. Dietary antioxidants and prostate cancer: a review. Nutr Cancer. 2013;65(6):793-801. doi:10.1080/01635581.2013.806672
  11. Lum T, Connolly M, Marx A, et al. Effects of fresh watermelon consumption on the acute satiety response and cardiometabolic risk factors in overweight and obese adults. Nutrients. 2019;11(3). doi:10.3390/nu11030595
  12. Martínez-Sánchez A, Ramos-Campo DJ, Fernández-Lobato B, Rubio-Arias JA, Alacid F, Aguayo E. Biochemical, physiological, and performance response of a functional watermelon juice enriched in L-citrulline during a half-marathon race. Food Nutr Res. 2017;61(1):1330098. doi:10.1080/16546628.2017.1330098
  13. Glenn JM, Gray M, Wethington LN, Stone MS, Stewart RW, Moyen NE. Acute citrulline malate supplementation improves upper- and lower-body submaximal weightlifting exercise performance in resistance-trained females. Eur J Nutr. 2017;56(2):775-784. doi:10.1007/s00394-015-1124-6
  14. American College of Allergy, Asthma & Immunology. Food allergy to melons?.
  15. Maoto M, Beswa D, Jideani A. Watermelon as a potential fruit snack. Int J Food Prop. 2019;22(1):355-70. doi:10.1080/10942912.2019.1584212
  16. Paris H. Origin and emergence of the sweet dessert watermelon, Citrullus lanatus. Ann Bot. 2015;116(2):133-48. doi:10.1093/aob/mcv077

By Debra Manzella, RN
Debra Manzella, MS, RN, is a corporate clinical educator at Catholic Health System in New York with extensive experience in diabetes care.