Calories in Grapefruit: Per 100 g, Per Serving & Nutrition Facts
42 kcal per 100 g · Nutri-Score A
Serving (half, 150 g) — 63 kcal · P/F/C 0.8/0.1/8 g
sugar: medium saturated fat: low salt: low fiber: low
Grapefruit is a vitamin C-rich citrus with a bitter edge. It interacts with some medications, so check the leaflet if you take any regularly.
How many calories in grapefruit: per 100 g and per serving
| Nutrient | Per 100 g | Serving: half, 150 g |
|---|---|---|
| Calories | 42 kcal | 63 kcal |
| Protein | 0.8 g | 1.2 g |
| Fat | 0.1 g | 0.2 g |
| incl. saturated | 0 g | 0 g |
| Carbohydrates | 8 g | 12 g |
| incl. sugars | 7 g | 11 g |
| Fiber | 1.6 g | 2.4 g |
| Salt | 0 g | 0 g |
Values per 100 g as eaten, averaged from food composition tables (USDA FoodData Central and others) and rounded — a specific brand or recipe will differ a little.
protein 9%fat 2%carbs 89%
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Grapefruit: nutrition highlights
It has 2.4 g of fiber per serving — roughly 10% of the 25 g a day most adults fall short of. It's light: 42 kcal per 100 g, so even a big serving barely moves your daily total.
On the open Nutri-Score algorithm, grapefruit gets an A: one of the better picks in its category. The score weighs calories, sugar, saturated fat and salt against protein, fiber and the share of fruit, vegetables, legumes and nuts.
What to watch
- No red flags on the traffic light: sugar, salt and saturated fat per 100 g are all within the low-to-medium range.
How much movement is one serving?
One serving (half, 150 g) is 63 kcal — roughly 21 min of easy walking or 8 min of cycling for a 70 kg (154 lb) person. In the diary, minutes are worked out for your weight and the activities you actually do.
Healthier swaps for Grapefruit
Swaps are picked the same way the app does it: from the same kind of food, with a serving matched to the same calories (±25%), and only when the swap is clearly better — not “salad instead of pizza”.
- Guava — 110 g, 66 kcal: +3.5 g fibre.
- Blackcurrants — 140 g, 62 kcal: +4.3 g fibre.
- Feijoa — 130 g, 64 kcal: +5.9 g fibre.
- Passion Fruit — 80 g, 64 kcal: +5.9 g fibre.
Grapefruit vs similar foods: calories compared
| Per 100 g | Kcal | P / F / C, g |
|---|---|---|
| Peaches | 39 | 0.9 / 0.3 / 8.5 |
| Grapefruit | 42 | 0.8 / 0.1 / 8 |
| Papaya | 43 | 0.5 / 0.3 / 9.1 |
| Nectarines | 44 | 1.1 / 0.3 / 9 |
| Raspberries | 46 | 0.8 / 0.5 / 8.3 |
| Apricots | 46 | 1.4 / 0.4 / 9.1 |
| Plums | 46 | 0.7 / 0.3 / 10 |
FAQ
How many calories are in 100 g of grapefruit?
100 g of grapefruit has 42 calories, with 0.8 g protein, 0.1 g fat and 8 g carbohydrates (1.6 g fiber).
How many calories are in a serving of grapefruit?
A serving (half, 150 g) has 63 calories: 1.2 g protein, 0.2 g fat and 12 g carbs.
What are the macros of grapefruit?
Per 100 g: 0.8 g protein, 8 g carbs and 0.1 g fat. By calories that's about 9% protein, 89% carbs and 2% fat.
How long do you have to walk to burn a serving of grapefruit?
About 21 min of easy walking or 8 min of cycling for a 70 kg (154 lb) person — that's the 63 calories in one serving (half, 150 g).
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