Fruits
Grapefruit nutrition facts
A 100 g serving of grapefruit provides 0 calories, 0 g protein, 0 g carbohydrate, and 0 g fat — about 0% of its calories from protein, 0% from carbohydrate, and 0% from fat. The interactive label below toggles between a serving and 100 g.
Calorie split
| Nutrient | Per 100 g | Per 100 g |
|---|---|---|
| Calories | 0 | 0 |
| Protein | 0 g | 0 g |
| Total carbohydrate | 0 g | 0 g |
| Total fat | 0 g | 0 g |
Vitamins & minerals
Per serving (100 g)
- Vitamin C
- 38.0 mg
- Thiamin (B1)
- 0.06 mg
- Riboflavin (B2)
- 0.10 mg
- Niacin (B3)
- 0.26 mg
- Vitamin B6
- 0.06 mg
- Magnesium
- 9.58 mg
- Phosphorus
- 20.1 mg
- Zinc
- 0.03 mg
- Copper
- 0.03 mg
- Manganese
- 0.02 mg
Photo by engin akyurt on Unsplash
Selecting, storing & prepping grapefruit
- Selecting
- Choose grapefruit that feels heavy for its size with smooth, firm skin.
- Storing
- Citrus fruit keeps about 10 days at room temperature or 1–2 weeks refrigerated.
- Prepping
- A serrated grapefruit spoon or paring knife makes it easy to separate the segments from the membrane for eating.
Storage guidance from the USDA FoodKeeper database (FSIS, Cornell University, and the Food Marketing Institute).
Nutrition highlights
Per 100 g, grapefruit is an excellent source of Vitamin C.
% of the FDA Daily Value per 100 g serving.
Key metrics
Nutrient density
Per 100 kcal, grapefruit delivers about 10% of a Daily Value on average across 22 beneficial nutrients. The score is its percentile for that measure among the 177 foods in our database — higher means more nutrition per calorie. How this is calculated.
- More vitamin C than 94% of foods · 78% of fruits
Density counts protein, fiber, and vitamins and minerals (not fat, sodium, or sugar), each capped so a single nutrient can’t dominate, with a calorie floor so very-low-calorie foods aren’t overstated. It measures nutrition per calorie within our database — a useful guide, not a complete verdict on how “healthy” a food is.
Similar foods & swaps
The closest fruits to grapefruit by nutrition (per 100 g), and how each differs.
Questions
- How many calories are in grapefruit?
- A 100 g serving of grapefruit has about 0 calories. Per 100 g, it has 0 calories — a very low calorie density.
- How much protein is in grapefruit?
- Grapefruit provides about 0 g of protein per 100 g serving.
- What are the macros in grapefruit?
- Per serving, grapefruit has roughly 0 g protein, 0 g carbohydrate, and 0 g fat. By calories, that is 0% protein, 0% carbohydrate, and 0% fat.
- Is grapefruit high in protein?
- Grapefruit has a protein density of about 0 g per 100 kcal, and 0% of its calories come from protein. Foods above roughly 10 g per 100 kcal are generally considered protein-dense.
- What vitamins and minerals are in grapefruit?
- Per 100 g, grapefruit is a notable source of Vitamin C. The label above lists the full micronutrient profile with % Daily Values.
- What is the nutritional value of grapefruit?
- Per 100 g, grapefruit has 0 calories, 0 g protein, 0 g carbohydrate, and 0 g fat, plus notable amounts of Vitamin C. See the full nutrition facts label above for every vitamin and mineral.
Use it
More fruits
References & methodology
- Data source: U.S. Department of Agriculture, Agricultural Research Service — FoodData Central, FDC ID 2758977 (public domain).
- Daily Values: FDA Nutrition Facts label, 2016 update (adults and children aged 4+).
- Source claims: a serving supplying 10–19% of the Daily Value is a “good source”; 20% or more is an “excellent source” (FDA, 21 CFR 101.54).
- Calorie split: Atwater general factors — 4 kcal/g for protein and carbohydrate, 9 kcal/g for fat.
- Last reviewed: June 2026. Values are typical figures and vary with variety, ripeness, and preparation.
NutriFactsHub. “Grapefruit Nutrition Facts.” https://nutrifactshub.com/foods/grapefruit