Food calories · USDA data
Calories in a grapefruit
52 calories
in ½ fruit (3-3/4" dia), 123 g
- Protein
- 0.9 g
- Carbs
- 13.1 g
- Fat
- 0.2 g
- Fiber
- 2 g
A grapefruit has 52 calories. That is USDA's figure for ½ fruit (3-3/4" dia), which weighs 123 g. Per 100 g, grapefruit has 42 calories.
Almost all of its calories, 91%, come from carbohydrate.
It takes 238 g of grapefruit to reach 100 calories, which is about 1.9 × ½ fruit (3-3/4" dia).
Calories by portion
| Portion | Weight | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|---|
| ½ fruit (3-3/4" dia) | 123 g | 52 | 0.9 g | 13.1 g | 0.2 g |
| 1 cup sections, with juice | 230 g | 97 | 1.8 g | 24.5 g | 0.3 g |
| 1 serving (food label) | 154 g | 65 | 1.2 g | 16.4 g | 0.2 g |
| 1 oz | 28.3 g | 12 | 0.2 g | 3 g | 0 g |
| 100 g | 100 g | 42 | 0.8 g | 10.7 g | 0.1 g |
Portion weights are USDA's own. Your grapefruit may weigh more or less; for an exact number, weigh it and enter the grams in the food calorie lookup.
Where the calories come from
- Protein: 7% of calories (0.8 g per 100 g)
- Carbohydrate: 91% (10.7 g per 100 g, of which 1.6 g fiber)
- Fat: 3% (0.1 g per 100 g)
Shares use the general factors of 4 calories per gram of protein and carbohydrate and 9 per gram of fat, so they can differ a little from USDA's calorie figure. Daily Values are the FDA's adult Daily Values.
Compared with similar foods
Weight for weight, grapefruit has the fewest calories of these four (42 per 100 g) and papaya the most (43).
| Per 100 g | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|
| Grapefruit | 42 | 0.8 g | 10.7 g | 0.1 g |
| Applesauce | 42 | 0.2 g | 11.3 g | 0.1 g |
| Blackberries | 43 | 1.4 g | 9.6 g | 0.5 g |
| Papaya | 43 | 0.5 g | 10.8 g | 0.3 g |
Work out your own portion
The food calorie lookup has 3,070 foods. Pick a portion or type a weight in grams or ounces, then add foods to a plate to see the total for a meal. To see how a meal fits your day, the calorie calculator works out your daily calories.
Questions people ask
How many calories is in a grapefruit?
A grapefruit has 52 calories. USDA weighs ½ fruit (3-3/4" dia) at 123 g, and grapefruit has 42 calories per 100 g.
How much protein does a grapefruit have?
½ fruit (3-3/4" dia) (123 g) has 0.9 g of protein, 2% of the 50 g Daily Value. Per 100 g it is 0.8 g.
How many carbs does a grapefruit have?
½ fruit (3-3/4" dia) has 13.1 g of carbohydrate, including 2 g of fiber, and 0.2 g of fat.
Source: USDA FoodData Central, SR Legacy (2018). USDA entry: Grapefruit, raw, pink and red, all areas (FDC ID 174673). Values are averages; a packaged food's label may differ.