Calories and Protein in Grapefruit
Nutrition data for grapefruit, raw, pink, red and white varieties.
Quick answer: 1/2 medium grapefruit (128 g) has about 41 calories, 0.8 g of protein, 0.1 g of fat and 10 g of carbohydrate. Per 100 g it has 32 calories and 0.6 g of protein. These figures are for grapefruit that is raw, pink, red and white varieties.
- 41calories
- 0.8 gprotein
- 0.1 gfat
- 10 gcarbs
per 1/2 medium grapefruit (128 g)
Serving sizes for grapefruit
| Serving | Weight | Calories | Protein | Fat | Carbs |
|---|---|---|---|---|---|
| 100 grams | 100 g (3.5 oz) | 32 | 0.6 g | 0.1 g | 8.1 g |
| 1/2 small grapefruit | 100 g (3.5 oz) | 32 | 0.6 g | 0.1 g | 8.1 g |
| 1/2 medium grapefruit | 128 g (4.5 oz) | 41 | 0.8 g | 0.1 g | 10 g |
| 1/2 large grapefruit | 166 g (5.9 oz) | 53 | 1 g | 0.2 g | 13 g |
| 1 cup of sections with juice | 230 g (8.1 oz) | 74 | 1.4 g | 0.2 g | 19 g |
Grapefruit is usually measured by the half. USDA lists a half medium grapefruit at about 128 g, a small half 100 g and a large half 166 g. A cup of sections with juice is about 230 g.
Full nutrition facts
| Nutrient | Per 100 g | Per 1/2 medium grapefruit (128 g) | % Daily Value* |
|---|---|---|---|
| Calories | 32 | 41 | |
| Total fat | 0.1 g | 0.1 g | 0% |
| Saturated fat | 0 g | 0 g | 0% |
| Total carbohydrate | 8.1 g | 10 g | 4% |
| Dietary fiber | 1.1 g | 1.4 g | 5% |
| Total sugars | 7 g | 8.9 g | |
| Protein | 0.6 g | 0.8 g | 2% |
| Potassium | 139 mg | 178 mg | 4% |
| Calcium | 12 mg | 15 mg | 1% |
| Iron | 0.1 mg | 0.1 mg | 1% |
| Magnesium | 8 mg | 10 mg | 2% |
| Vitamin C | 34.4 mg | 44 mg | 49% |
*Percent Daily Value uses the FDA reference amounts for a 2,000 calorie diet and is calculated for 1/2 medium grapefruit (128 g). Source: USDA FoodData Central, record 173033 (Grapefruit, raw, pink and red and white, all areas).
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About grapefruit nutrition
Grapefruit is a large, tangy citrus fruit. It is lower in calories than an orange per 100 g. One important note: grapefruit can interact with some prescription medicines, so it is worth checking with a pharmacist.
- Vitamin C: 44 mg in 1/2 medium grapefruit, about 49 percent of the Daily Value.
How preparation changes the numbers
- The FDA warns that grapefruit and grapefruit juice can interact with certain drugs, including some statins. If you take a prescription medicine, ask your pharmacist before adding it.
- Sprinkling sugar on a half grapefruit, or broiling it with honey, adds calories that are not in these figures.
How grapefruit compares
Per 100 g, grapefruit ranks #25 of 30 foods on this site for protein and #5 for fewest calories.
Protein per 100 g
Calories per 100 g
Recipes with grapefruit
Questions about grapefruit
41 calories in 1/2 medium grapefruit (128 g), or 32 calories per 100 g. These figures are for grapefruit that is raw, pink, red and white varieties.
0.8 g of protein in 1/2 medium grapefruit (128 g), or 0.6 g per 100 g. Protein makes up about 8 percent of its calories.
About 41 calories in half a medium grapefruit (128 g).
About 44 mg, roughly 49 percent of the Daily Value, based on USDA data.
Not always. The FDA says grapefruit can raise the level of some medicines in your body. Read your prescription label and ask a pharmacist. Our grapefruit and medication guide explains why.
Related guides
Work out your own numbers
More in citrus fruits and juices
Sources and method
Nutrient values come from USDA FoodData Central (SR Legacy), record 173033: Grapefruit, raw, pink and red and white, all areas, retrieved 2026-09-30. Serving weights are USDA household measures, or a simple fraction of one. Brands, growing conditions and cooking method change real-world numbers, so treat every figure as a good estimate. Written and reviewed by Claudio; read how we develop and check our numbers.
