Grapefruit calories
Per 100 g, grapefruit has 32 kcal, 0.6 g of protein and 1.1 g of fiber. A usual serving of 128 g lands near 41 kcal.
A serving covers about 2% of the 2,000 kcal reference day used on US nutrition labels.
A real serving: 37 to 45 kcal
Nutrition facts
| Nutrient | Per 100 g | Per serving (128 g) |
|---|---|---|
| kcal | 32 | 41 |
| Protein, g | 0.6 | 0.8 |
| Fat, g | 0.1 | 0.1 |
| Carbs, g | 8.1 | 10.4 |
| Fiber, g | 1.1 | 1.4 |
Calories by portion
| Portions | Most likely | Range, kcal | Steps to burn |
|---|---|---|---|
| ½ · 64 g | 20 kcal | 18-23 | 640 |
| 1 · 128 g | 41 kcal | 37-45 | 1,300 |
| 1½ · 192 g | 61 kcal | 55-68 | 1,900 |
| 2 · 256 g | 82 kcal | 74-90 | 2,600 |
The same portion buttons as in the Kalorea app: ½, 1, 1½ and 2 servings.
How long to burn one serving
About 1,300 steps, or 10 minutes of brisk walking for an average adult.
How we count: an adult of 75 kg and 175 cm walking at 5.6 km/h burns (4.3 − 1) × 75 = 247.5 kcal an hour above resting. Steps are distance divided by a stride of 0.415 × height. That's about 31 steps per kcal. The Kalorea app uses your own height and weight.
Fruit varies mostly by size. A small banana and a large one can differ by 60 kcal, so something for scale in the frame helps.
Compared with similar foods
| Food | kcal / 100 g | Serving | Protein / 100 g |
|---|---|---|---|
| Lemon | 29 | 17 kcal / 58 g | 1.1 g |
| Lime | 30 | 20 kcal / 67 g | 0.7 g |
| Watermelon | 30 | 46 kcal / 152 g | 0.6 g |
| Grapefruit | 32 | 41 kcal / 128 g | 0.6 g |
| Cantaloupe | 34 | 54 kcal / 160 g | 0.8 g |
| Honeydew melon | 36 | 61 kcal / 170 g | 0.5 g |
| Peach | 39 | 58 kcal / 150 g | 0.9 g |
| Applesauce | 42 | 51 kcal / 122 g | 0.2 g |
| Papaya | 43 | 62 kcal / 145 g | 0.5 g |
Lightest in this group per 100 g: Lemon.
Where the numbers come from
Values from USDA FoodData Central, a public domain (CC0) database by the US Department of Agriculture: FDC 173033 (Grapefruit, raw, pink and red and white, all areas).
The ±10% range covers natural variation between samples: size, variety, ripeness or fat content, and how it was prepared.
Questions
How many calories in grapefruit?
Grapefruit has about 32 kcal per 100 g. A typical 128 g serving is about 41 kcal, and realistically anywhere from 37 to 45 kcal depending on the recipe and portion.
How much protein is in grapefruit?
0.6 g of protein per 100 g, or about 0.8 g in a 128 g serving.
Your plate isn't a lab sample
Snap your own grapefruit and Kalorea estimates what's actually on your plate, with a range and macros.