If you’re wondering how many calories are in a grapefruit, here is the simple answer:
A medium grapefruit contains approximately 104 calories, while half a grapefruit contains about 52 calories.
Understanding how many calories are in a grapefruit can help you manage portion sizes and daily calorie intake more accurately.
Grapefruit is widely recognized as a low-calorie, nutrient-rich citrus fruit that supports weight management, immune health, and heart wellness. Because it contains high water content, fiber, and antioxidants, grapefruit is commonly recommended in balanced nutrition plans.
If you track fruit nutrition values, you can explore more fruit calorie guides here.
Grapefruit Calories Quick Summary
- Medium grapefruit: 104 calories
- Half grapefruit: 52 calories
- 100 grams grapefruit: 42 calories
- 1 cup grapefruit segments: 74 calories
- 1 cup grapefruit juice: 90–95 calories
Grapefruit is approximately 90% water, which makes it filling while remaining low in calories.
Grapefruit Calories by Serving Size
| Serving Size | Calories |
|---|---|
| Half medium grapefruit | 52 calories |
| One medium grapefruit | 104 calories |
| 100 grams grapefruit | 42 calories |
| 1 cup grapefruit segments | 74 calories |
| Grapefruit juice (1 cup) | 90–95 calories |
Calorie values may vary slightly depending on grapefruit variety and ripeness. When tracking how many calories are in a grapefruit, size and weight can slightly change the final number.
Grapefruit Nutrition Facts
Grapefruit contains essential vitamins, minerals, and antioxidants that support overall health.
Vitamins and Minerals in One Medium Grapefruit
- Vitamin C: Provides more than 100% of daily recommended intake
- Vitamin A: Supports vision and immune health
- Fiber: About 2 grams per serving
- Potassium: Helps regulate blood pressure and heart function
- Antioxidants: Includes flavonoids and lycopene that help reduce inflammation
Grapefruit is also naturally low in fat, sodium, and cholesterol, making it a heart-healthy fruit.
Carbohydrates and Sugar in Grapefruit
A 100-gram serving of grapefruit contains:
- Carbohydrates: About 8 grams
- Natural sugar: 6–7 grams
- Fiber: Around 1 gram
Despite containing natural sugar, grapefruit has a low glycemic index, meaning it causes slower blood sugar increases compared to many fruits.
Pink vs Red vs White Grapefruit Calories
Different grapefruit varieties contain similar calorie levels but slightly different nutrients:
- Pink grapefruit: Slightly sweeter and rich in vitamin C
- Red grapefruit: Higher antioxidant levels, especially lycopene
- White grapefruit: Slightly lower sugar content
All varieties remain low in calories and highly nutritious.
Health Benefits of Grapefruit
Supports Weight Loss
Grapefruit is commonly included in weight-management diets because it:
- Contains very few calories
- Has high water content that promotes fullness
- Provides fiber that helps control appetite
Strengthens the Immune System
Grapefruit is rich in vitamin C, which:
- Supports immune defense
- Helps fight infections
- Supports skin repair and collagen production
Improves Heart Health
The fiber, potassium, and antioxidants in grapefruit may help:
- Lower cholesterol levels
- Improve blood circulation
- Reduce risk of cardiovascular disease
Helps Control Blood Sugar
Due to its low glycemic index and fiber content, grapefruit may help stabilize blood sugar levels when consumed in moderation.
Supports Hydration and Digestion
Because grapefruit contains high water content, it helps maintain hydration and supports digestive health.
Grapefruit Compared to Other Fruits
| Fruit | Calories per 100g |
|---|---|
| Grapefruit | 42 calories |
| Orange | 47 calories |
| Apple | 52 calories |
| Mango | 60 calories |
| Banana | 89 calories |
Grapefruit is among the lowest-calorie fruits available.
Is Grapefruit Good for Weight Loss?
Yes. Grapefruit is widely recommended for weight management because it combines:
- Low calorie density
- High fiber content
- High water content
- Natural sweetness with moderate sugar levels
Including grapefruit in meals may help reduce overall calorie intake while providing important nutrients. Because how many calories are in a grapefruit is relatively low, it fits well into calorie-controlled diets.
Potential Risks of Grapefruit
Although grapefruit offers many health benefits, it can interact with certain medications. Compounds in grapefruit may block enzymes responsible for breaking down drugs in the body.
Grapefruit may interact with:
- Cholesterol medications (statins)
- Blood pressure medications
- Some anti-anxiety medications
- Certain antihistamines
If you take prescription medication, consult a healthcare professional before consuming grapefruit regularly.
Best Ways to Add Grapefruit to Your Diet
You can include grapefruit in many healthy meals:
- Eat fresh grapefruit halves for breakfast
- Add grapefruit segments to salads
- Blend grapefruit into smoothies
- Use grapefruit in fruit desserts
- Make grapefruit salsa with seafood or chicken
- Drink fresh grapefruit juice in moderation
Frequently Asked Questions
How many calories are in half a grapefruit?
Half a medium grapefruit contains about 52 calories.
How many calories are in one whole grapefruit?
One medium grapefruit contains approximately 104 calories.
Is grapefruit high in sugar?
No. Grapefruit contains natural sugars but has a relatively low glycemic index.
Can grapefruit help with fat loss?
Grapefruit does not directly burn fat, but its low calorie density and fiber content may support weight loss efforts.
Is it safe to eat grapefruit every day?
Most healthy individuals can eat grapefruit daily, but people taking certain medications should consult a doctor first.
Scientific and Nutrition Sources
The nutrition data and health information in this article are supported by trusted research organizations:
- USDA FoodData Central
- Harvard School of Public Health
- National Institutes of Health
- Cleveland Clinic Health Library
Final Thoughts
If you’re still wondering how many calories are in a grapefruit, a medium fruit contains about 104 calories while half contains around 52. This makes grapefruit one of the lowest-calorie fruits you can include in a balanced diet.
Beyond its low calorie content, grapefruit provides vitamin C, antioxidants, fiber, and hydration benefits that support immune function, digestion, and heart health. However, individuals taking certain medications should consult a healthcare professional before consuming grapefruit regularly.
