Calories in Starfruits: Nutrition Facts & Serving Sizes
Per 1 medium (3-5/8" long) (91g)
Per 100g
Source: USDA FoodData Central, SR Legacy, March 2026.
A medium starfruit (91g) contains about 28 calories with 6.1g of carbs and 2.5g of fiber, making it one of the lowest-calorie tropical fruits available. Per 100g, starfruit provides 31 calories with 6.7g of carbs, 1g of protein, 0.3g of fat, and 2.8g of fiber. Starfruit (also called carambola) is named for its distinctive five-pointed star shape when sliced crosswise. The standout micronutrient is vitamin C at 34.4mg per 100g, covering about 38% of the daily recommended intake. Folate is present at 12mcg per 100g. The high fiber-to-calorie ratio (2.8g fiber per 31 calories) is exceptional, making starfruit one of the most fiber-dense low-calorie fruits available. For anyone cutting calories who wants variety in their fruit options, starfruit adds a unique, sweet-tart flavor profile at very low caloric cost.
Nutrition Highlights
Calories by Serving Size
| Serving | Cal | Protein | Carbs | Fat | Fiber |
|---|---|---|---|---|---|
| 1 small (3-1/8" long) (70g) | 21.7 | 0.7g | 4.7g | 0.2g | 2g |
| 1 cup, cubes (132g) | 40.9 | 1.3g | 8.8g | 0.4g | 3.7g |
| 1 medium (3-5/8" long) (91g) | 28.2 | 0.9g | 6.1g | 0.3g | 2.5g |
| 1 cup, sliced (108g) | 33.5 | 1.1g | 7.2g | 0.3g | 3g |
| 1 large (4-1/2" long) (124g) | 38.4 | 1.2g | 8.3g | 0.4g | 3.5g |
| 100g | 31 | 1g | 6.7g | 0.3g | 2.8g |
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Full Nutrition Facts (per 100g)
| Nutrient | Amount | % Daily Value |
|---|---|---|
| Calories | 31 | 2% |
| Protein | 1g | 2% |
| Total Fat | 0.3g | |
| Total Carbohydrates | 6.7g | 2% |
| Dietary Fiber | 2.8g | 10% |
| Sugars | 4g | 8% |
| Sodium | 2mg |
Vitamins & Minerals (per 100g)
| Nutrient | Amount | % Daily Value |
|---|---|---|
| Calcium | 3mg | 0% |
| Iron | 0.1mg | 1% |
| Potassium | 133mg | 3% |
| Vitamin A | 3mcg | 0% |
| Vitamin C | 34.4mg | 38% |
| Magnesium | 10mg | 2% |
| Phosphorus | 12mg | 1% |
| Zinc | 0.1mg | 1% |
| Selenium | 0.6mcg | 1% |
| Folate | 12mcg | 3% |
| Niacin (B3) | 0.4mg | 3% |
% Daily Values based on a 2,000 calorie diet (FDA reference).
Health Benefits of Starfruits
Starfruit is a tropical fruit with an outstanding calorie-to-nutrient ratio. At just 28 calories for a medium fruit, it provides 2.5g of fiber, 34.4mg of vitamin C, and a range of antioxidants with negligible caloric impact. For anyone cutting calories who wants flavorful, satisfying snacks, starfruit is one of the most interesting low-calorie options.
The 34.4mg of vitamin C per 100g supports immune function, collagen synthesis (for joint and connective tissue health in heavy lifters), and iron absorption. The antioxidants in starfruit, including quercetin, epicatechin, and gallic acid, help neutralize free radicals produced during intense exercise.
Starfruit's 2.8g of fiber per 100g is notable for such a low-calorie food. Fiber supports gut health, slows digestion, and contributes to satiety. The low carb content (6.7g per 100g) and very low calorie density make starfruit suitable even for lower-carb eating approaches.
Important note: starfruit contains oxalic acid and a neurotoxin called caramboxin that is normally filtered by healthy kidneys. People with kidney disease or on certain medications should avoid starfruit as it can cause serious adverse effects. For people with healthy kidneys, moderate consumption (1 to 2 fruits per day) is safe.
Dietary Considerations
Starfruit is naturally gluten-free, vegan, and very low in carbs (6.7g per 100g), making it moderately keto-friendly. At only 28 calories per medium fruit, it is excellent for weight loss as a low-calorie snack with real nutritional value. Important caution: people with kidney disease must avoid starfruit because it contains compounds that can cause severe neurological symptoms when kidney filtration is impaired.
Daily Intake (100g)
100g of starfruit provides 2% of a 2,000-calorie diet.
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Frequently Asked Questions
How many calories in starfruit?
A medium starfruit (91g) has about 28 calories. A large starfruit (124g) has about 38 calories. Per 100g, starfruit contains 31 calories. It is one of the lowest-calorie tropical fruits available.
Is starfruit good for weight loss?
Yes, starfruit is excellent for weight loss. At only 28 calories per medium fruit with 2.5g of fiber and a sweet-tart flavor that satisfies cravings, it is one of the best low-calorie fruit options. It helps add variety to a diet without adding calories.
How much protein in starfruit?
Starfruit contains 1g of protein per 100g. A medium fruit has about 0.9g of protein. Starfruit is not a protein source and should be eaten for its vitamins, fiber, and low-calorie density.
Is starfruit safe to eat?
For healthy individuals, starfruit is safe in moderate amounts. However, people with kidney disease must avoid starfruit because it contains oxalic acid and caramboxin, which healthy kidneys filter out but damaged kidneys cannot, potentially causing serious neurological problems.
Is starfruit keto-friendly?
Starfruit is relatively keto-friendly at 6.7g of carbs per 100g. A medium fruit has only 6.1g of carbs. This is lower than most fruits, making starfruit a better keto option than bananas, mangoes, or grapes.
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