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Watermelon vs Grapefruit - In-Depth Nutrition Comparison

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How are Watermelon and Grapefruit different?

  • Grapefruit is higher than Watermelon in Vitamin C.
  • Grapefruit covers your daily need of Vitamin C 26% more than Watermelon.

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

Infographic

Watermelon vs Grapefruit 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" chart below show how much of the daily needs can be covered by 300 grams of the food
Watermelon
Watermelon
4
:
4
Grapefruit
Grapefruit
Contains more Iron +200%
Contains more Magnesium +11.1%
Contains more Zinc +42.9%
Contains more Copper +31.3%
Contains more Calcium +214.3%
Contains more Phosphorus +63.6%
Contains more Potassium +20.5%
Contains less Sodium -100%
Equal in Magnesium - 9
Watermelon
Calcium Iron Magnesium Phosphorus Potassium Sodium Zinc Copper 3% 9% 8% 5% 10% 1% 3% 14%
Grapefruit
Calcium Iron Magnesium Phosphorus Potassium Sodium Zinc Copper 7% 3% 7% 8% 12% 0% 2% 11%
Contains more Iron +200%
Contains more Magnesium +11.1%
Contains more Zinc +42.9%
Contains more Copper +31.3%
Contains more Calcium +214.3%
Contains more Phosphorus +63.6%
Contains more Potassium +20.5%
Contains less Sodium -100%
Equal in Magnesium - 9

Vitamin Comparison

Vitamin comparison score is based on the number of vitamins by which one or the other food is richer. The "coverage" chart below show how much of the daily needs can be covered by 300 grams of the food
Watermelon
Watermelon
1
:
9
Grapefruit
Grapefruit
Contains more Vitamin K +∞%
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%
Watermelon
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%
Grapefruit
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%
Contains more Vitamin K +∞%
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%

Macronutrient Comparison

Macronutrient breakdown side-by-side comparison
Watermelon
Watermelon
2
:
3
Grapefruit
Grapefruit
Contains more Protein +26.2%
Contains more Carbs +41.2%
Contains more Other +54.2%
Equal in Fats - 0.14
Equal in Water - 88.06
Watermelon
8% 91%
Protein: 0.61 g
Fats: 0.15 g
Carbs: 7.55 g
Water: 91.45 g
Other: 0.24 g
Grapefruit
11% 88%
Protein: 0.77 g
Fats: 0.14 g
Carbs: 10.66 g
Water: 88.06 g
Other: 0.37 g
Contains more Protein +26.2%
Contains more Carbs +41.2%
Contains more Other +54.2%
Equal in Fats - 0.14
Equal in Water - 88.06

Fat Type Comparison

Fat type breakdown side-by-side comparison
Watermelon
Watermelon
3
:
0
Grapefruit
Grapefruit
Contains less Saturated Fat -23.8%
Contains more Monounsaturated Fat +85%
Contains more Polyunsaturated fat +38.9%
Watermelon
16% 36% 49%
Saturated Fat: 0.016 g
Monounsaturated Fat: 0.037 g
Polyunsaturated fat: 0.05 g
Grapefruit
27% 26% 47%
Saturated Fat: 0.021 g
Monounsaturated Fat: 0.02 g
Polyunsaturated fat: 0.036 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
Watermelon
Watermelon
2
:
2
Grapefruit
Grapefruit
Contains more Fructose +89.8%
Contains more Maltose +∞%
Contains more Sucrose +190.1%
Equal in Glucose - 1.61
Watermelon
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
Grapefruit
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
Contains more Fructose +89.8%
Contains more Maltose +∞%
Contains more Sucrose +190.1%
Equal in Glucose - 1.61

Comparison summary table

Pay attention to the most right column. It shows the amounts side by side, making it easier to realize the amount of difference.
Watermelon Grapefruit
Lower in Sugar ok
Lower in Saturated Fat ok
Lower in price ok
Lower in Sodium ok
Lower in glycemic index ok
Rich in vitamins ok
Lower in Cholesterol Equal
Rich in minerals Equal

All nutrients comparison - raw data values

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

Which food is preferable for your diet?

ok
ok
is better in case of low diet
Watermelon Grapefruit
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 show how much of your all daily needs across all vitamins or minerals this food would cover if you took three 100 grams servings of it (approximation of 3 serving sizes)
Vitamins Daily Need Coverage Score
9%
Watermelon
20%
Grapefruit
Minerals Daily Need Coverage Score
6%
Watermelon
6%
Grapefruit

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 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)
Which food is richer in minerals?
?
It cannot be stated which food is richer in vitamins. See the charts below for detailed information. See the charts below for detailed information. See the charts below for detailed information.

References

The source of all the nutrient values on the page (excluding the main article the sources for which are presented separately if present) is the USDA's FoodCentral. The exact links to the foods presented on this page can be found below.

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