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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.
Contains more Calcium +214.3%
Contains more Phosphorus +63.6%
Contains more Potassium +20.5%
Contains less Sodium -100%
Contains more Iron +200%
Contains more Magnesium +11.1%
Contains more Zinc +42.9%
Contains more Copper +31.3%
Contains more Manganese +72.7%
Contains more Selenium +300%
Calcium Iron Magnesium Phosphorus Potassium Sodium Zinc Copper Manganese Selenium 7% 3% 7% 8% 12% 0% 2% 11% 3% 1%
Calcium Iron Magnesium Phosphorus Potassium Sodium Zinc Copper Manganese Selenium 3% 9% 8% 5% 10% 1% 3% 14% 5% 3%
Contains more Calcium +214.3%
Contains more Phosphorus +63.6%
Contains more Potassium +20.5%
Contains less Sodium -100%
Contains more Iron +200%
Contains more Magnesium +11.1%
Contains more Zinc +42.9%
Contains more Copper +31.3%
Contains more Manganese +72.7%
Contains more Selenium +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.
:
Contains more Vitamin A +102.1%
Contains more Vitamin E +160%
Contains more Vitamin C +285.2%
Contains more Vitamin B1 +30.3%
Contains more Vitamin B2 +47.6%
Contains more Vitamin B3 +14.6%
Contains more Vitamin B5 +18.6%
Contains more Vitamin B6 +17.8%
Contains more Folate +333.3%
Contains more Vitamin K +∞%
Vitamin A Vitamin E Vitamin D Vitamin C Vitamin B1 Vitamin B2 Vitamin B3 Vitamin B5 Vitamin B6 Folate Vitamin B12 Vitamin K 69% 3% 0% 105% 11% 8% 4% 16% 13% 10% 0% 0%
Vitamin A Vitamin E Vitamin D Vitamin C Vitamin B1 Vitamin B2 Vitamin B3 Vitamin B5 Vitamin B6 Folate Vitamin B12 Vitamin K 35% 1% 0% 27% 9% 5% 4% 14% 11% 3% 0% 1%
Contains more Vitamin A +102.1%
Contains more Vitamin E +160%
Contains more Vitamin C +285.2%
Contains more Vitamin B1 +30.3%
Contains more Vitamin B2 +47.6%
Contains more Vitamin B3 +14.6%
Contains more Vitamin B5 +18.6%
Contains more Vitamin B6 +17.8%
Contains more Folate +333.3%
Contains more Vitamin K +∞%

Macronutrient Comparison

Macronutrient breakdown side-by-side comparison
Contains more Protein +26.2%
Contains more Carbs +41.2%
Contains more Other +54.2%
Equal in Fats - 0.15
Equal in Water - 91.45
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 Protein +26.2%
Contains more Carbs +41.2%
Contains more Other +54.2%
Equal in Fats - 0.15
Equal in Water - 91.45

Fat Type Comparison

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

Carbohydrate type comparison

Carbohydrate type breakdown side-by-side comparison
Contains more Sucrose +190.1%
Contains more Fructose +89.8%
Contains more Maltose +∞%
Equal in Glucose - 1.58
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 Sucrose +190.1%
Contains more Fructose +89.8%
Contains more Maltose +∞%
Equal in Glucose - 1.58

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
Net carbs 9.06g 7.15g Grapefruit
Protein 0.77g 0.61g Grapefruit
Fats 0.14g 0.15g Watermelon
Carbs 10.66g 7.55g Grapefruit
Calories 42kcal 30kcal Grapefruit
Fructose 1.77g 3.36g Watermelon
Sugar 6.89g 6.2g Watermelon
Fiber 1.6g 0.4g Grapefruit
Calcium 22mg 7mg Grapefruit
Iron 0.08mg 0.24mg Watermelon
Magnesium 9mg 10mg Watermelon
Phosphorus 18mg 11mg Grapefruit
Potassium 135mg 112mg Grapefruit
Sodium 0mg 1mg Grapefruit
Zinc 0.07mg 0.1mg Watermelon
Copper 0.032mg 0.042mg Watermelon
Manganese 0.022mg 0.038mg Watermelon
Selenium 0.1µg 0.4µg Watermelon
Vitamin A 1150IU 569IU Grapefruit
Vitamin A RAE 58µg 28µg Grapefruit
Vitamin E 0.13mg 0.05mg Grapefruit
Vitamin C 31.2mg 8.1mg Grapefruit
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
Folate 13µg 3µg Grapefruit
Vitamin K 0µg 0.1µg 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
Saturated Fat 0.021g 0.016g Watermelon
Monounsaturated Fat 0.02g 0.037g Watermelon
Polyunsaturated fat 0.036g 0.05g Watermelon

Which food is preferable for your diet?

ok
ok
is better in case of low diet
Grapefruit Watermelon
Low Fats diet ok
Low Carbs diet ok
Low Calories 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
20%
Grapefruit
9%
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.