How many calories are in a standard 1/2 medium fruit (123g) of grapefruit?

A standard 1/2 medium fruit (123g) (123g) of grapefruit contains 52 calories, with 1g protein, 13.2g carbs, and 0.2g fat according to USDA FoodData Central (FDC ID: 174676).

Is grapefruit good for a weight loss calorie deficit?

Tart citrus fruit known for naringin flavonoids, high water content, and low calorie density. Its macronutrient ratio and micronutrient profile make it a verified whole food choice for structured energy balance.

fruitsUSDA FDC ID: 174676(Citrus paradisi)

Grapefruit Calories & Nutrition Facts

Q: What is the calorie density of grapefruit per 100g?

Per 100 grams, grapefruit provides 42 kcal, 0.8g protein, 10.7g carbohydrates, and 1.6g dietary fiber.

Quick Answer: A standard 1/2 medium fruit (123g) of grapefruit contains 52 calories. Per 100 grams, grapefruit provides 42 kcal, 0.8g protein, 10.7g carbohydrates, and 0.1g fat based on verified USDA FoodData Central records.

Tart citrus fruit known for naringin flavonoids, high water content, and low calorie density. Use the interactive portion selector below to calculate exact calories and macronutrients for small, medium, large, or custom gram portions.

Interactive Portion Selector

Calculate Nutrition by Serving Size

grams

Calories

42kcal

per 100 grams (100g)

Protein

0.8g

8% of energy

Carbohydrates

10.7g

102% of energy

Total Fat

0.1g

2% of energy

Serving: 100 grams (100 grams)

Comprehensive Nutrition Facts (Per 100g)

Standard laboratory basis: 100 grams edible portion

100 g standard

Calories42 kcal

Total Fat0.1 g

Sodium0 mg

Potassium135 mg

Total Carbohydrate10.7 g

Dietary Fiber1.6 g

Total Sugars6.9 g

Protein0.8 g

Preparation & Cooking Variations

How different cooking methods affect caloric density and moisture content per 100g

Preparation Method	Calories / 100g	Protein	Carbs	Fat	Nutritional Impact
Fresh Raw	42 kcal	0.8g	10.7g	0.1g	Standard fresh fruit

Nutritional Comparison with Similar Foods

Direct evidence-based comparisons derived from verified database records

Grapefruit vs Orange

View Orange →

Grapefruit offers lower sugar (6.9g vs 9.4g) and a lower glycemic index than oranges.

Verified Nutrition Data•Source: USDA FoodData Central(ID: 174676)

Verified: 2026-09-01|Provenance Policy|FDC Record ↗

Related fruits Foods

Orange47 kcal / 100g Strawberry32 kcal / 100g Lemon29 kcal / 100g

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