Grapefruit Calories and Macros — Nutrition Facts per ½ medium (123g)

A serving of grapefruit — ½ medium (123g) — comes to 52 calories, with 1g of protein, 13.2g of carbs, and 0.1g of fat. Below is the complete USDA-sourced breakdown, plus how those numbers play with typical calorie and macro targets.

Grapefruit nutrition facts

*Percent Daily Values are based on a 2,000-calorie diet. Source: USDA FoodData Central.

Pink/red grapefruit, peeled segments. Worth knowing: grapefruit interacts with several common medications — the macros are the least interesting thing about it.

How does grapefruit fit your goals?

Grapefruit is a carb-dominant food, with 13.2g of carbohydrate per ½ medium (123g). That makes it a useful pre- or post-training fuel source, especially for endurance work or higher-volume strength sessions. If you're tracking for fat loss, the lever isn't avoiding carbs — it's portioning them around the parts of your day where the energy is actually used.

Diet-wise, grapefruit fits low-carb and vegan and vegetarian eating patterns.

Micronutrients worth noting

Beyond the macros, grapefruit pulls real weight on vitamin C (43% DV) per ½ medium (123g) — the kind of micronutrient density that calorie counts alone don't show.

How grapefruit compares to other fruits

Tracking grapefruit in Bento Bunny

Logging foods like grapefruit manually means digging through a database, picking the right entry, and adjusting the serving size — multiple taps per meal. With Bento Bunny's AI photo tracking, you snap one picture and the macros land in your daily total automatically. For grapefruit specifically, the model recognises typical portion sizes well, so the numbers above will land within a few percent of what you'd get from manual weighing.

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Browse all fruits in the food database.