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Grapefruit vs. Watermelon — In-Depth Nutrition Comparison

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How are Grapefruit and Watermelon different?

  • Grapefruit is higher than Watermelon in Vitamin C.
  • Grapefruit covers your daily need of Vitamin C 26% more than Watermelon.
  • Grapefruit contains 4 times more Fiber than Watermelon. Grapefruit contains 1.6g of Fiber, while Watermelon contains 0.4g.

Grapefruit, raw, pink and red, all areas and Watermelon, raw types were used in this article.

Infographic

Grapefruit vs Watermelon infographic
Infographic link

Mineral Comparison

Mineral comparison score is based on the number of minerals by which one or the other food is richer. The "coverage" charts below show how much of the daily needs can be covered by 300 grams of the food.
Magnesium Magnesium Calcium Calcium Potassium Potassium Iron Iron Copper Copper Zinc Zinc Phosphorus Phosphorus Sodium Sodium Manganese Manganese Selenium Selenium 6.4% 6.6% 12% 3% 11% 1.9% 7.7% 0% 2.9% 0.55%
Magnesium Magnesium Calcium Calcium Potassium Potassium Iron Iron Copper Copper Zinc Zinc Phosphorus Phosphorus Sodium Sodium Manganese Manganese Selenium Selenium 7.1% 2.1% 9.9% 9% 14% 2.7% 4.7% 0.13% 5% 2.2%
Contains more CalciumCalcium +214.3%
Contains more PotassiumPotassium +20.5%
Contains more PhosphorusPhosphorus +63.6%
Contains less SodiumSodium -100%
Contains more MagnesiumMagnesium +11.1%
Contains more IronIron +200%
Contains more CopperCopper +31.3%
Contains more ZincZinc +42.9%
Contains more ManganeseManganese +72.7%
Contains more SeleniumSelenium +300%

Vitamin Comparison

Vitamin comparison score is based on the number of vitamins by which one or the other food is richer. The "coverage" charts below show how much of the daily needs can be covered by 300 grams of the food.
Vitamin C Vit. C Vitamin A Vit. A Vitamin E Vit. E Vitamin D Vit. D Vitamin B1 Vit. B1 Vitamin B2 Vit. B2 Vitamin B3 Vit. B3 Vitamin B5 Vit. B5 Vitamin B6 Vit. B6 Vitamin B12 Vit. B12 Vitamin K Vit. K Folate Folate Choline Choline 104% 69% 2.6% 0% 11% 7.2% 3.8% 16% 12% 0% 0% 9.8% 4.2%
Vitamin C Vit. C Vitamin A Vit. A Vitamin E Vit. E Vitamin D Vit. D Vitamin B1 Vit. B1 Vitamin B2 Vit. B2 Vitamin B3 Vit. B3 Vitamin B5 Vit. B5 Vitamin B6 Vit. B6 Vitamin B12 Vit. B12 Vitamin K Vit. K Folate Folate Choline Choline 27% 34% 1% 0% 8.3% 4.8% 3.3% 13% 10% 0% 0.25% 2.3% 2.2%
Contains more Vitamin CVitamin C +285.2%
Contains more Vitamin AVitamin A +102.1%
Contains more Vitamin EVitamin E +160%
Contains more Vitamin B1Vitamin B1 +30.3%
Contains more Vitamin B2Vitamin B2 +47.6%
Contains more Vitamin B3Vitamin B3 +14.6%
Contains more Vitamin B5Vitamin B5 +18.6%
Contains more Vitamin B6Vitamin B6 +17.8%
Contains more FolateFolate +333.3%
Contains more CholineCholine +87.8%
Contains more Vitamin KVitamin K +∞%
~equal in Vitamin D ~0µg
~equal in Vitamin B12 ~0µg

Macronutrient Comparison

Macronutrient breakdown side-by-side comparison
11% 88%
Protein: 0.77 g
Fats: 0.14 g
Carbs: 10.66 g
Water: 88.06 g
Other: 0.37 g
8% 91%
Protein: 0.61 g
Fats: 0.15 g
Carbs: 7.55 g
Water: 91.45 g
Other: 0.24 g
Contains more ProteinProtein +26.2%
Contains more CarbsCarbs +41.2%
Contains more OtherOther +54.2%
~equal in Fats ~0.15g
~equal in Water ~91.45g

Fat Type Comparison

Fat type breakdown side-by-side comparison
27% 26% 47%
Saturated Fat: Sat. Fat 0.021 g
Monounsaturated Fat: Mono. Fat 0.02 g
Polyunsaturated fat: Poly. Fat 0.036 g
16% 36% 49%
Saturated Fat: Sat. Fat 0.016 g
Monounsaturated Fat: Mono. Fat 0.037 g
Polyunsaturated fat: Poly. Fat 0.05 g
Contains less Sat. FatSaturated Fat -23.8%
Contains more Mono. FatMonounsaturated Fat +85%
Contains more Poly. FatPolyunsaturated fat +38.9%

Carbohydrate type comparison

Carbohydrate type breakdown side-by-side comparison
51% 23% 26%
Starch: 0 g
Sucrose: 3.51 g
Glucose: 1.61 g
Fructose: 1.77 g
Lactose: 0 g
Maltose: 0 g
Galactose: 0 g
19% 25% 54%
Starch: 0 g
Sucrose: 1.21 g
Glucose: 1.58 g
Fructose: 3.36 g
Lactose: 0 g
Maltose: 0.06 g
Galactose: 0 g
Contains more SucroseSucrose +190.1%
Contains more FructoseFructose +89.8%
Contains more MaltoseMaltose +∞%
~equal in Starch ~0g
~equal in Glucose ~1.58g
~equal in Lactose ~0g
~equal in Galactose ~0g

Comparison summary table

Pay attention to the rightmost column. It displays the amounts side by side, giving a clearer understanding of the difference.
Grapefruit Watermelon
Lower in Sugar ok
Lower in Saturated Fat ok
Lower in price ok
Rich in minerals ok
Lower in Sodium ok
Lower in Glycemic Index ok
Rich in vitamins ok
Lower in Cholesterol Equal

All nutrients comparison - raw data values

Nutrient Grapefruit Watermelon Opinion
Calories 42kcal 30kcal Grapefruit
Protein 0.77g 0.61g Grapefruit
Fats 0.14g 0.15g Watermelon
Vitamin C 31.2mg 8.1mg Grapefruit
Net carbs 9.06g 7.15g Grapefruit
Carbs 10.66g 7.55g Grapefruit
Magnesium 9mg 10mg Watermelon
Calcium 22mg 7mg Grapefruit
Potassium 135mg 112mg Grapefruit
Iron 0.08mg 0.24mg Watermelon
Sugar 6.89g 6.2g Watermelon
Fiber 1.6g 0.4g Grapefruit
Copper 0.032mg 0.042mg Watermelon
Zinc 0.07mg 0.1mg Watermelon
Phosphorus 18mg 11mg Grapefruit
Sodium 0mg 1mg Grapefruit
Vitamin A 1150IU 569IU Grapefruit
Vitamin A 58µg 28µg Grapefruit
Vitamin E 0.13mg 0.05mg Grapefruit
Manganese 0.022mg 0.038mg Watermelon
Selenium 0.1µg 0.4µg Watermelon
Vitamin B1 0.043mg 0.033mg Grapefruit
Vitamin B2 0.031mg 0.021mg Grapefruit
Vitamin B3 0.204mg 0.178mg Grapefruit
Vitamin B5 0.262mg 0.221mg Grapefruit
Vitamin B6 0.053mg 0.045mg Grapefruit
Vitamin K 0µg 0.1µg Watermelon
Folate 13µg 3µg Grapefruit
Choline 7.7mg 4.1mg Grapefruit
Saturated Fat 0.021g 0.016g Watermelon
Monounsaturated Fat 0.02g 0.037g Watermelon
Polyunsaturated fat 0.036g 0.05g Watermelon
Tryptophan 0.008mg 0.007mg Grapefruit
Threonine 0.013mg 0.027mg Watermelon
Isoleucine 0.008mg 0.019mg Watermelon
Leucine 0.015mg 0.018mg Watermelon
Lysine 0.019mg 0.062mg Watermelon
Methionine 0.007mg 0.006mg Grapefruit
Phenylalanine 0.013mg 0.015mg Watermelon
Valine 0.015mg 0.016mg Watermelon
Histidine 0.008mg 0.006mg Grapefruit
Fructose 1.77g 3.36g Watermelon

Which food is preferable for your diet?

ok
ok
is better in case of low diet
Grapefruit Watermelon
Low Calories diet ok
Low Fats diet ok
Low Carbs diet ok
Low Glycemic Index diet ok

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Vitamins & Minerals Daily Need Coverage Score

The summary scores indicate the extent to which this food can fulfill your daily vitamin and mineral requirements if you consume 3 servings, consisting of 100 grams of each (an approximation of 3 serving sizes).
Vitamins Daily Need Coverage Score
18%
Grapefruit
8%
Watermelon
Minerals Daily Need Coverage Score
5%
Grapefruit
6%
Watermelon

Comparison summary

Which food is lower in Sugar?
Watermelon
Watermelon is lower in Sugar (difference - 0.69g)
Which food is lower in Saturated Fat?
Watermelon
Watermelon is lower in Saturated Fat (difference - 0.005g)
Which food is cheaper?
Watermelon
Watermelon is cheaper (difference - $0.2)
Which food is richer in minerals?
Watermelon
Watermelon is relatively richer in minerals
Which food contains less Sodium?
Grapefruit
Grapefruit contains less Sodium (difference - 1mg)
Which food is lower in glycemic index?
Grapefruit
Grapefruit is lower in glycemic index (difference - 51)
Which food is richer in vitamins?
Grapefruit
Grapefruit is relatively richer in vitamins
Which food contains less Cholesterol?
?
The foods are relatively equal in Cholesterol (0 mg)

References

All the values for which the sources are not specified explicitly are taken from FDA’s Food Central. The exact link to the food presented on this page can be found below.

  1. Grapefruit - https://fdc.nal.usda.gov/fdc-app.html#/food-details/174673/nutrients
  2. Watermelon - https://fdc.nal.usda.gov/fdc-app.html#/food-details/167765/nutrients

All the Daily Values are presented for males aged 31-50, for 2000-calorie diets.

Data provided by FoodStruct.com should be considered and used as information only. Please consult your physician before beginning any diet.