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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
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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
Contains more Calcium +214.3%
Contains more Potassium +20.5%
Contains more Phosphorus +63.6%
Contains less Sodium -100%
Contains more Iron +200%
Contains more Magnesium +11.1%
Contains more Copper +31.3%
Contains more Zinc +42.9%
Iron Calcium Potassium Magnesium Copper Zinc Phosphorus Sodium 3% 7% 12% 7% 11% 2% 8% 0%
Iron Calcium Potassium Magnesium Copper Zinc Phosphorus Sodium 9% 3% 10% 8% 14% 3% 5% 1%
Contains more Calcium +214.3%
Contains more Potassium +20.5%
Contains more Phosphorus +63.6%
Contains less Sodium -100%
Contains more Iron +200%
Contains more Magnesium +11.1%
Contains more Copper +31.3%
Contains more Zinc +42.9%

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
:
Contains more Vitamin C +285.2%
Contains more Vitamin A +102.1%
Contains more Vitamin E +160%
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 C Vitamin A Vitamin E Vitamin D Vitamin B1 Vitamin B2 Vitamin B3 Vitamin B5 Vitamin B6 Vitamin B12 Vitamin K Folate 105% 69% 3% 0% 11% 8% 4% 16% 13% 0% 0% 10%
Vitamin C Vitamin A Vitamin E Vitamin D Vitamin B1 Vitamin B2 Vitamin B3 Vitamin B5 Vitamin B6 Vitamin B12 Vitamin K Folate 27% 35% 1% 0% 9% 5% 4% 14% 11% 0% 1% 3%
Contains more Vitamin C +285.2%
Contains more Vitamin A +102.1%
Contains more Vitamin E +160%
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 +∞%

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.
Grapefruit Watermelon
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 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
Cholesterol 0mg 0mg
Vitamin D 0IU 0IU
Iron 0.08mg 0.24mg Watermelon
Calcium 22mg 7mg Grapefruit
Potassium 135mg 112mg Grapefruit
Magnesium 9mg 10mg 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
Starch 0g 0g
Phosphorus 18mg 11mg Grapefruit
Sodium 0mg 1mg Grapefruit
Vitamin A 1150IU 569IU Grapefruit
Vitamin E 0.13mg 0.05mg Grapefruit
Vitamin D 0µg 0µg
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 B12 0µg 0µg
Vitamin K 0µg 0.1µg Watermelon
Folate 13µg 3µg Grapefruit
Trans Fat 0g 0g
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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Vitamin and Mineral Summary Scores

The summary score is calculated by summing up the daily values contained in 300 grams of the product. Obviously the more the food fulfills human daily needs, the more the summary score is.
Vitamin Summary Score
20
Grapefruit
9
Watermelon
Mineral Summary Score
6
Grapefruit
6
Watermelon

Macronutrients Comparison

Macronutrient comparison charts compare the amount of protein, total fats, and total carbohydrates in 300 grams of the food. The displayed values show how much of the daily needs can be covered by 300 grams of food.
Protein
5%
Grapefruit
4%
Watermelon
Carbohydrates
11%
Grapefruit
8%
Watermelon
Fats
1%
Grapefruit
1%
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 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. 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.