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How many carbs are in grapefruit?
0.5 small (approx 3-1/2" dia) of grapefruit contains about 8.1g of carbohydrate, 7g net carbs after subtracting 1.1g of fiber, 0.6g of protein, and 32 calories.
Carbs by portion size
| Portion | Total carbs | Fiber | Net carbs |
|---|---|---|---|
| 0.5 small (approx 3-1/2" dia) (100g) | 8.1g | 1.1g | 7g |
| 0.5 medium (approx 4" dia) (128g) | 10.3g | 1.4g | 8.9g |
| 0.5 large (approx 4-1/2" dia) (166g) | 13.4g | 1.8g | 11.6g |
| 1 cup sections, with juice (230g) | 18.6g | 2.5g | 16.1g |
Net carbs in grapefruit
0.5 small (approx 3-1/2" dia) of grapefruit contains 7g of net carbs — total carbs (8.1g) minus dietary fiber (1.1g). Net carbs are the carbs your body actually digests and that raise blood glucose. See our guide to net carbs for how this calculation works and when to use it.
Full nutrition for grapefruit (per 100g)
- Calories: 32 kcal
- Carbohydrate: 8.1g
- Dietary fiber: 1.1g
- Sugars: 7g
- Protein: 0.6g
- Fat: 0.1g
Reference values from USDA FoodData Central (sr legacy dataset, fdcId 173033). Values are per 100 grams.
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Download on the App StoreFrequently asked questions
How many carbs are in grapefruit?
0.5 small (approx 3-1/2" dia) of grapefruit contains about 8.1g of total carbohydrate. After subtracting 1.1g of fiber, the net carbs are about 7g.
How many net carbs are in grapefruit?
Net carbs in 0.5 small (approx 3-1/2" dia) of grapefruit are about 7g — that is total carbs (8.1g) minus dietary fiber (1.1g). See our net carbs explainer for the full calculation.
Is grapefruit good for diabetics?
Grapefruit contains carbohydrates that will raise blood glucose. Whether it fits your meal plan depends on the portion and your overall daily target. Most U.S. diabetes care teams use total carbs (not net) for insulin dosing — see our diabetes carb-counting guide.
Is grapefruit keto-friendly?
Whether grapefruit fits a keto plan depends on your daily net-carb budget (typically under 20–30g per day). One serving (0.5 small (approx 3-1/2" dia)) provides about 7g of net carbs.