Cucumber: calories, protein, vitamins
USDA FoodData Central data, retrieved October 2026 · state: fresh
Cucumber: 15 kcal, 0.7 g protein, 0.1 g fat and 3.6 g carbohydrate per 100 g. A typical portion is 1 small cucumber (100 g): about 15 kcal. Below you will find a table with the share of the daily reference, a comparison with five similar foods and where the numbers come from.
- Good source of vitamin K · 16%
- Low in calories
- Low in carbohydrate
- Low in fat
| Nutrition | per 100 g | % daily value | portion (100 g) | % daily value |
|---|---|---|---|---|
| Calories | 15 kcal | 1% | 15 kcal | 1% |
| Protein | 0.65 g | 1% | 0.65 g | 1% |
| Fat | 0.11 g | — | 0.11 g | — |
| Carbohydrate | 3.63 g | — | 3.63 g | — |
| Fibre | 0.5 g | 2% | 0.5 g | 2% |
| Sugar(limit) | 1.67 g | 2% | 1.67 g | 2% |
| Saturated fat(limit) | 0.04 g | 0% | 0.04 g | 0% |
| Sodium(limit) | 2 mg | 0% | 2 mg | 0% |
| Vitamin K | 16.4 µg | 16% | 16.4 µg | 16% |
| Potassium | 147 mg | 5% | 147 mg | 5% |
| Copper | 0.04 mg | 5% | 0.04 mg | 5% |
Typical portion: 1 small cucumber, 100 g, about 15 kcal. % daily value is for a reference adult (average of men and women); "limit" marks a daily limit, not a target. "High" starts at 20% per 100 g.
Your portion is different? Photograph the plate: free, no signup.
Calories from a photoThese are general estimates generated from published formulas, not a medical prescription. Not reviewed by a doctor or registered dietitian.
Read the full disclaimer
Every number on this page (calorie targets, macro splits and any suggested meal plan) is produced by formulas (Mifflin-St Jeor for basal metabolic rate, standard activity multipliers) or, for AI-generated meal plans, by a language model applying those same formulas. On meal-plan pages the carbohydrate figure for each meal is calculated by difference: total calories minus protein and fat calories, divided by 4. It is not measured or estimated on its own, so read it as an arithmetic balance and not as an independent nutritional analysis of the dish. None of it is individualized medical or nutritional advice, and none of it has been reviewed by a registered dietitian, physician or other licensed healthcare professional.
Ask your doctor or a registered dietitian what is right for you before starting a new diet, especially if you are pregnant or breastfeeding, have a diagnosed medical condition, take prescription medication, or have a history of disordered eating. If you have kidney disease or another medical condition, ask your clinician before raising protein.
Mealyno never recommends a calorie target below your calculated Basal Metabolic Rate (BMR), the minimum energy your body needs at complete rest. Even the most aggressive weight-loss setting is clamped at that floor.
Calorie and BMR estimates use the Mifflin-St Jeor equation (Mifflin MD, St Jeor ST, et al. Am J Clin Nutr. 1990).
Generated: October 2026
Also searched as: cucumbers, fresh cucumber.
About this food: Cucumber
Cucumber is mostly water, which shows in the numbers: 15 kcal per 100 g and 0.5 g of fibre. The entry is cucumber with the peel, raw, so it fits both the long greenhouse cucumber and the short, bumpy field cucumber you find at the market. If you peel yours, the figure moves only a little, because the peel is thin.
A small cucumber of 100 g is 15 kcal, which is why a cucumber hardly registers in a diary. The calories of a cucumber salad come from the dressing: sour cream in the summer salad, oil in a tomato and cucumber plate, mayonnaise in a heavier mix. Salted and pickled cucumbers have their own entry with far more sodium, so do not log them as fresh.
To avoid watery salad, slice the cucumber just before serving, or salt it, leave for about ten minutes and pour off the liquid. Greenhouse varieties have thin skin and few seeds. Field cucumbers with thick skin and big seeds are nicer when you scoop out the seeds, and bitterness, if present, usually sits near the stem end.
Store cucumbers in the fridge and use them within about a week, as they soften quickly and dislike the coldest spots near the back wall. A wrinkled, soft tip means they are past their best.
What it is high and low in
No nutrient in 100 g of cucumber reaches 20% of the daily reference, but it is a good source of vitamin K (16%).
It is low in calories (up to 40 kcal per 100 g), carbohydrate (up to 5 g per 100 g) and fat (up to 3 g per 100 g). The rule is the same for every food: "high" means at least 20% of the daily reference in 100 g, "good source" means 10-19%. For protein it takes at least 8 g per 100 g and a fifth of the calories from protein.
How it compares with similar foods
We compared cucumber with the five foods in our table that are closest in composition (Radish, Celery stalks, Tomato, Romaine lettuce and Zucchini), per 100 g.
Rank among the six: Protein (1 = most): 6th of 6; Calories (1 = fewest): 2nd of 6; Fibre (1 = most): 6th of 6; Carbohydrate (1 = fewest): 5th of 6. The order is computed from the USDA values, so it moves if the table changes.
| Food | kcal | protein | fat | carbs | fibre |
|---|---|---|---|---|---|
| Cucumber | 15 | 0.7 | 0.1 | 3.6 | 0.5 |
| Radish | 16 | 0.7 | 0.1 | 3.4 | 1.6 |
| Celery stalks | 14 | 0.7 | 0.2 | 3 | 1.6 |
| Tomato | 18 | 0.9 | 0.2 | 3.9 | 1.2 |
| Romaine lettuce | 17 | 1.2 | 0.3 | 3.3 | 2.1 |
| Zucchini | 17 | 1.2 | 0.3 | 3.1 | 1 |
All values per 100 g.
Where the numbers come from
The values on this page come from USDA FoodData Central, SR Legacy (entry 168409: "Cucumber, with peel, raw"). It is the US government's reference database and its data is public domain (CC0). We retrieved it on October 4, 2026 and show it per 100 g of the food in the stated state (fresh). When USDA reports no value for a vitamin or mineral we write "no data", never zero.
The daily value column compares each amount with a reference adult: the average of the adult male and female values in the US and Canada Dietary Reference Intakes (age 19-30), a 2,000 kcal day and 50 g of protein. Sodium (2300 mg), sugar (90 g of total sugars, the EU reference intake) and saturated fat (22 g, under 10% of calories) are limits, not targets. These are general guides for healthy adults, not medical advice.
The portion weight is a typical size, not a USDA value, so weigh your own portion.
Calorie and nutrient questions
How many calories are in 100 g of cucumber?
15 kcal per 100 g, with 0.7 g protein, 0.1 g fat and 3.6 g carbohydrate. A typical portion (1 small cucumber, 100 g) has about 15 kcal.
How much protein is in cucumber?
100 g has 0.7 g of protein, which is 1% of a 50 g daily reference, and a typical portion (100 g) has 0.7 g. Protein supplies 14% of its calories.
Which vitamins and minerals does cucumber contain?
The most per 100 g, as a share of the daily reference: vitamin K 16.4 µg (16%). Every other tracked vitamin or mineral is under 10% or has no USDA value.