QUICK ANSWER
How many calories are in coconut water?
Ready-to-drink unsweetened coconut water provides 18 kcal per 100 g. Scale from the edible portion and keep other states separate.
18 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
Coconut water 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
- 18 kcal
- Protein
- 0.22 g
- Carbohydrate
- 4.24 g
- Fat
- 0 g
- Fibre
- 0 g
- Potassium
- 165 mg
- Vitamin C
- 9.9 mg
- Magnesium
- 6 mg
Source: USDA FoodData Central SR Legacy record 174831. 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
0.22 g per 100 g. From Beverages, Coconut water, ready-to-drink, unsweetened.
Carbohydrate
4.24 g per 100 g. From Beverages, Coconut water, ready-to-drink, unsweetened.
Fat
0 g per 100 g. From Beverages, Coconut water, ready-to-drink, unsweetened.
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 coconut water fits in a varied eating pattern.
Potassium
165 mg per 100 g in the selected USDA record.
Vitamin C
9.9 mg per 100 g in the selected USDA record.
Magnesium
6 mg per 100 g in the selected USDA record.
Manganese
0.221 mg 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.
Ready-to-drink, unsweetened
Selected and only mapped state.
Sweetened or flavoured
Not represented by the selected record; use the package nutrition information.
Fresh from a coconut
Do not assume a packaged ready-to-drink record is identical.
Smoothie or mixed drink
Log every added fruit, milk, powder or sweetener separately.
PRACTICAL CONTEXT
How coconut water 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 18 kcal per 100 g, the 100 g example is 18 kcal.
Fibre check
The selected record lists 0 g fibre per 100 g.
Protein check
The selected record lists 0.22 g protein per 100 g.
Best logging move
Check the package for added sugar and use the actual container amount rather than assuming every bottle is one cup.
QUALITY & SAFETY
How to choose, store and prepare it
Store
Follow the unopened storage directions on the package.
After opening or cooking
After opening, keep the beverage covered and chilled as directed by the manufacturer.
Prepare
Pour with a clean cup rather than drinking from a container that will be stored again.
Safety boundary
The USDA nutrient record does not provide storage duration; follow the package date and handling instructions.
PHOTO LOGGING
How to log coconut water 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: Beverages, Coconut water, ready-to-drink, unsweetened.
- 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
Coconut water calorie and nutrition questions
How many calories are in 100 g of coconut water?
18 kcal in the selected Beverages, Coconut water, ready-to-drink, unsweetened record.
How much fibre is in coconut water?
0 g per 100 g in the selected record.
Which coconut water state does this page use?
Beverages, Coconut water, ready-to-drink, unsweetened. Preparation and edible state are part of the answer.
Is coconut milk the same as coconut water?
No. This selected record is an unsweetened ready-to-drink coconut water, not coconut milk.
How are the portion calories calculated?
Each portion is scaled from 18 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
Beverages, Coconut water, ready-to-drink, unsweetened, 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 or food-safety limits; use package directions and current local guidance where relevant.
Open USDA FoodData Central SR Legacy record 174831 ↗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.