Fruits · Nutrition facts
🍊Calories in Grapefruit
A 1/2 fruit of grapefruit (123 g) has 52 calories, with 1 g protein, 13.5 g carbs and 0.1 g fat.
Calories
52
Protein
1 g
Carbs
13.5 g
Fat
0.1 g
Grapefruit nutrition by serving size
| Serving | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|
| 1/2 fruit | 52 | 1 g | 13.5 g | 0.1 g |
| 100 g | 42 | 0.8 g | 11 g | 0.1 g |
| 1 oz (28 g) | 12 | 0.2 g | 3.1 g | 0 g |
| 1 cup (≈225 g) | 95 | 1.8 g | 24.8 g | 0.2 g |
| 200 g | 84 | 1.6 g | 22 g | 0.2 g |
Values are approximate, rounded from USDA FoodData Central and OpenFoodFacts references. Real plates vary — that's exactly why CalorieScan AI lets you correct any estimate in plain English.
Macro breakdown
- Per 100 g: 42 cal
- Per 1 oz: 12 cal
- Fiber: 1.6 g / 100 g
- Sugar: 7 g / 100 g
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Grapefruit vs other fruits
Frequently asked
How many calories are in grapefruit?
One 1/2 fruit of grapefruit (123 g) has about 52 calories. Per 100 g, grapefruit has 42 calories.
How much protein is in grapefruit?
A 1/2 fruit serving of grapefruit provides roughly 1 g of protein (0.8 g per 100 g).
What are the macros for grapefruit?
Per 1/2 fruit: 1 g protein, 13.5 g carbs and 0.1 g fat — that's roughly 7% protein, 91% carbs and 2% fat by calories.
How do I log grapefruit without weighing it?
Take a photo of your plate in CalorieScan AI. The app recognises grapefruit, estimates the portion, and returns calories and macros in about three seconds — then you can fine-tune it in plain English ("make that two servings").
Stop looking up calories.
Snap a photo of grapefruit — or any meal — and CalorieScan AI does the math. Free on iPhone.
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