QUICK ANSWER
How many calories are in grapefruit?
Raw grapefruit across pink, red and white varieties provides 32 kcal per 100 g. Scale from the edible portion and keep other states separate.
32 kcal / 100 gNutrition values describe a reference food state, not every individual item. Variety, water content, preparation and portion weight can change the estimate.
THE NUMBERS
Grapefruit nutrition facts per 100 g
The values below use the reference state shown at the top of this page. Keeping one gram basis makes it easier to compare foods before translating the values to the portion you actually ate.
- Calories
- 32 kcal
- Protein
- 0.63 g
- Carbohydrate
- 8.08 g
- Fat
- 0.1 g
- Fibre
- 1.1 g
- Vitamin C
- 34.4 mg
- Potassium
- 139 mg
- Vitamin A
- 46 µg RAE
Source: USDA FoodData Central SR Legacy record 173033. Values may be rounded for readability.
SERVING SIZE
Calories by portion and serving weight
Words such as “small,” “medium,” “half” and “one piece” are convenient but imprecise. Grams make the estimate reproducible, particularly when natural foods vary in size.
MACROS
Carbohydrate, protein and fat explained
Protein
0.63 g per 100 g. From Grapefruit, raw, pink and red and white, all areas.
Carbohydrate
8.08 g per 100 g. From Grapefruit, raw, pink and red and white, all areas.
Fat
0.1 g per 100 g. From Grapefruit, raw, pink and red and white, all areas.
MORE THAN CALORIES
Fibre, vitamins and minerals
One food does not need to provide every nutrient. These are the characteristics most useful for understanding where grapefruit fits in a varied eating pattern.
Vitamin C
34.4 mg per 100 g in the selected USDA record.
Potassium
139 mg per 100 g in the selected USDA record.
Vitamin A
46 µg RAE per 100 g in the selected USDA record.
Folate
10 µg per 100 g in the selected USDA record.
FOOD STATE MATTERS
How preparation changes the nutrition estimate
A reliable calorie entry should describe the food you actually ate—not merely a food with a similar name.
Pink, red and white, raw
Selected all-areas reference.
Colour-specific raw fruit
Use a white-only or pink/red record when the variety is known and closer matching matters.
Canned sections
Match water, juice or light-syrup pack.
Juice
Do not use a whole-fruit entry for grapefruit juice.
PRACTICAL CONTEXT
How grapefruit can fit different goals
There is no universal “good” or “bad” food. Portion, frequency, the rest of the meal, preferences and individual health needs all matter.
Portion math
At 32 kcal per 100 g, the 50 g example is 16 kcal.
Fibre check
The selected record lists 1.1 g fibre per 100 g.
Protein check
The selected record lists 0.63 g protein per 100 g.
Best logging move
Weigh the edible sections, use a colour-specific record when useful and keep canned or juiced products separate.
QUALITY & SAFETY
How to choose, store and prepare it
Store
Keep whole grapefruit in a cool, dry place or chilled.
After opening or cutting
Keep cut fruit covered and chilled.
Prepare
Rinse the outside before cutting and use clean utensils.
Safety boundary
The nutrient record does not address medication interactions or storage duration; use current pharmacist and food-safety guidance.
PHOTO LOGGING
How to log grapefruit more accurately
A food photo can suggest the ingredient, but it cannot always reveal exact weight, hidden oil or preparation details. These checks turn an image guess into a better estimate.
- 01
Match the exact reference state: Grapefruit, raw, pink and red and white, all areas.
- 02
Use edible grams. Calories are scaled from the selected per-100-g record; named portion weights come from the same local USDA record.
- 03
Log oil, sauce, sweetener, salt and recipe ingredients separately.
- 04
Use a separate record when preparation changes the food state.
COMMON QUESTIONS
Grapefruit calorie and nutrition questions
How many calories are in 100 g of grapefruit?
32 kcal in the selected Grapefruit, raw, pink and red and white, all areas record.
How much fibre is in grapefruit?
1.1 g per 100 g in the selected record.
Which grapefruit state does this page use?
Grapefruit, raw, pink and red and white, all areas. Preparation and edible state are part of the answer.
When should I use a colour-specific grapefruit record?
Use a white-only or pink/red record when the variety is known and you want a closer match; otherwise this selected all-colours record is the generic reference.
How are the portion calories calculated?
Each portion is scaled from 32 kcal per 100 g. Named portion weights come from the selected source record.
KEEP EXPLORING
Related food guides
SOURCES & METHOD
Where these numbers come from
Grapefruit, raw, pink and red and white, all areas, per 100 g edible portion. Numeric nutrition and named-portion claims use the selected local USDA record. Preparation notes cover the common USDA forms of this food. The nutrient record does not establish storage duration, clinical advice or food-safety limits; use package directions and current authoritative guidance where relevant.
Open USDA FoodData Central SR Legacy record 173033 ↗Page reviewed 26 August 2026. We show the food state, gram basis and source record so readers can check the estimate instead of treating one number as universally exact.