Grapefruit vs Watermelon: All Nutritional Differences

Where is more calories, protein, carbs - what is more healthy?

Rating: 4.4 on 11 votes.
Marcin PiotrowiczMarcin Piotrowicz
Grapefruit - calories, kcal, weight, nutrition
Watermelon - calories, kcal, weight, nutrition

Fact 1: There is More Calories in Grapefruit

At first glance, you can see that in grapefruit is more calories than in watermelon.

Grapefruit has 42 kcal per 100g and watermelon 30 kcal per 100g so it is pretty easy to calculate that the difference is about 40%.

In grapefruit and in watermelon most calories came from carbs.

See tables below to compare grapefruit with watermelon in details.

Fact 2: Grapefruit And Watermelon Nutrition Difference

Watermelon vs Grapefruit: Vitamins and Minerals Comparison

per 100gGrapefruitWatermelon
Calories42 30
Carbohydrates10.7 g7.6 g
Fat0.14 g0.15 g
Dietary fiber1.7 g0.4 g
Protein0.77 g0.6 g
Calcium22 mg7 mg
Iron0.08 mg0.24 mg
Magnessium9 mg10 mg
Potassium135 mg112 mg
Zink0.07 mg0.1 mg
Vitaminium B1 (Thiamine)0.043 mg0.033 mg
Vitaminium B3 (Niacin)0.204 mg0.178 mg
Vitaminium B50.262 mg0.221 mg
Vitaminium B60.053 mg0.045 mg
Vitaminium B9 (Folic acid)13 mg3 mg
Vitaminium C31.2 mg8.1 mg
Vitaminium E0.13 mg0.05 mg
Beta karoten686 mg303 mg

More protein in grapefruit

It is aslo easy to see see that in grapefruit is more protein than in watermelon.

There is 0.6g per 100g of watermelon and 0.77g per 100g of grapefruit so using simple math we can see that difference is about 28%.

More carbohydrates in grapefruit

In grapefruit is more carbohydrates than in watermelon.

There is 7.6g/100g of carbohydrates in watermelon and 10.7g/100g in grapefruit so let me do the math for you again - difference is about 41%.

Less fat in grapefruit

In grapefruit is less fats than in watermelon.

The tables above show us that there is 0.15g/100g of fats in watermelon and 0.14g/100g in grapefruit. In this case difference is about 7%.


  • Calories42
  • Carbohydrates10.7 g
  • Fat0.14 g
  • Dietary fiber1.7 g
  • Protein0.77 g
Grapefruit calories per:
100g | ounce | single piece | slice

Calories source

  • 91% CARBS.
  • 7% PROTEIN
  • 3% FAT


  • Calories30
  • Carbohydrates7.6 g
  • Fat0.15 g
  • Dietary fiber0.4 g
  • Protein0.6 g
Watermelon calories per:
100g | ounce | single piece | slice | cup | diced

Calories source

  • 89% CARBS
  • 7% PROTEIN
  • 4% FAT

Vitamins: watermelon vs grapefruit

Minerals: grapefruit vs watermelon

Marcin Piotrowicz
Author of this page
Marcin Piotrowicz creator
Healthy eating and living style promoter

All information about nutrition on this website was created with help of information from the official United States Department of Agriculture database.

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