Grapefruit — Nutrition & Calories
Grapefruit per 100g: 42 cal · 0.8g protein · 11g carbs · 0.1g fat · 1.6g fiber. Very low GI citrus fruit shown to support insulin sensitivity and weight loss.
Grapefruit contains 42 calories per 100g serving — 0.8g protein, 11g carbs, 0.1g fat, 1.6g fiber, 0mg sodium. Per 100g: 42 calories. Vegan. Keto-friendly. Gluten-free. Very low GI citrus fruit shown to support insulin sensitivity and weight loss.
Grapefruit Macros (per 100g)
Grapefruit Calories by Serving Size
| Serving | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|
| 1 g (100g) | 42 cal | 0.8g | 11.0g | 0.1g |
| 100g | 42 cal | 0.8g | 11.0g | 0.1g |
| 200g | 84 cal | 1.6g | 22.0g | 0.2g |
| 1 cup (~240g) | 101 cal | 1.9g | 26.4g | 0.2g |
| 1 oz (28g) | 12 cal | 0.2g | 3.1g | 0.0g |
Burn Off Grapefruit (42 calories) — Exercise Time
For a 154 lb (70 kg) person, time needed to burn 42 calories from Grapefruit:
- Walking (3 mph)10 min
- Running (6 mph)3 min
- Cycling (moderate)5 min
- Swimming (moderate)6 min
Calculated from MET values per Compendium of Physical Activities 2024 (Ainsworth et al., updated from 2011).
Diet Compatibility
Frequently Asked Questions
How many calories are in Grapefruit?
Grapefruit contains 42 calories per 100g serving. That's 42 calories per 100g, or 101 calories per cup (~240g). Calorie content varies based on preparation method.
What's the protein content in Grapefruit?
Grapefruit has 0.8g of protein per 100g (0.8g protein per 100g). Low protein content; consider pairing with high-protein foods.
Is Grapefruit keto-friendly?
Yes, Grapefruit is keto-friendly. With 11g carbs and 0.1g fat per 100g, it fits within standard keto macros (under 20-50g carbs/day). Net carbs: 9.4g.
Is Grapefruit suitable for vegans?
Yes, Grapefruit is vegan. It contains no animal products. Often used in plant-based diets for flavor.
What are the macros for Grapefruit?
Per 100g: 42 calories, 0.8g protein (8% cal), 11g carbs (105% cal), 0.1g fat (2% cal). Fiber: 1.6g. Sodium: 0mg.
How much Grapefruit should I eat to lose weight?
For weight loss, Grapefruit fits a calorie deficit if portioned. A typical 500 cal/day deficit means Grapefruit can comprise up to 1190g as a snack, or paired with vegetables for a meal. Use our Calorie Deficit Calculator to determine your daily target.