Calories in Cucumbers: Nutrition Facts & Serving Sizes
Per 1 medium (201g)
Per 100g
Source: USDA FoodData Central, SR Legacy, March 2026.
One medium cucumber (201g) contains 20.1 calories with 1.2g of protein, 4.4g of carbs, and 0.4g of fat. Per 100g, cucumber provides 10 calories with 0.6g of protein, 2.2g of carbs, and 0.2g of fat. Vitamin K is 7.2mcg per 100g. Potassium is 136mg per 100g. Folate provides 14mcg per 100g. Sodium is only 2mg per 100g. A cup of sliced cucumber (119g) has just 11.9 calories. Cucumber is one of the lowest-calorie vegetables available at 10 cal per 100g, making it essentially free from a calorie perspective. It is about 95% water by weight, which makes it useful for hydration and filling plates without adding calories. The mild flavor makes it versatile in salads, snack plates, and as a vehicle for dips.
Nutrition Highlights
Calories by Serving Size
| Serving | Cal | Protein | Carbs | Fat | Fiber |
|---|---|---|---|---|---|
| 1 slice (7g) | 0.7 | 0g | 0.2g | 0g | 0g |
| 1 cup, sliced (119g) | 11.9 | 0.7g | 2.6g | 0.2g | 0.8g |
| 1 large (8-1/4" long) (280g) | 28 | 1.7g | 6.2g | 0.6g | 2g |
| 1 small (6-3/8" long) (158g) | 15.8 | 0.9g | 3.5g | 0.3g | 1.1g |
| 1 stick (4" long) (9g) | 0.9 | 0.1g | 0.2g | 0g | 0.1g |
| 1 medium (201g) | 20.1 | 1.2g | 4.4g | 0.4g | 1.4g |
| 1 cup, pared, chopped (133g) | 13.3 | 0.8g | 2.9g | 0.3g | 0.9g |
| 100g | 10 | 0.6g | 2.2g | 0.2g | 0.7g |
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Full Nutrition Facts (per 100g)
| Nutrient | Amount | % Daily Value |
|---|---|---|
| Calories | 10 | 1% |
| Protein | 0.6g | 1% |
| Total Fat | 0.2g | |
| Saturated Fat | 0.1g | 1% |
| Total Carbohydrates | 2.2g | 1% |
| Dietary Fiber | 0.7g | 3% |
| Sugars | 1.4g | 3% |
| Sodium | 2mg |
Vitamins & Minerals (per 100g)
| Nutrient | Amount | % Daily Value |
|---|---|---|
| Saturated Fat | 0.1g | 0% |
| Calcium | 14mg | 1% |
| Iron | 0.2mg | 1% |
| Potassium | 136mg | 3% |
| Vitamin A | 4mcg | 0% |
| Vitamin C | 3.2mg | 4% |
| Vitamin B6 | 0.1mg | 6% |
| Magnesium | 12mg | 3% |
| Phosphorus | 21mg | 2% |
| Zinc | 0.2mg | 2% |
| Selenium | 0.1mcg | 0% |
| Folate | 14mcg | 4% |
% Daily Values based on a 2,000 calorie diet (FDA reference).
Health Benefits of Cucumbers
Cucumber is one of the most calorie-efficient foods you can eat. At just 10 calories per 100g with 0.7g of fiber and high water content, it adds significant volume to meals and snacks without touching your calorie budget.
The near-zero calorie density makes cucumber ideal for anyone cutting weight who wants to feel full. Adding a whole medium cucumber (201g) to your diet costs only 20 calories while contributing volume, crunch, and hydration. A full cup of sliced cucumber has fewer calories than a single bite of most other snacks.
Vitamin K at 7.2mcg per 100g supports bone metabolism and blood clotting. Potassium at 136mg per 100g contributes to electrolyte balance and helps offset sodium from higher-sodium foods. Folate at 14mcg per 100g supports DNA synthesis and cell function.
Cucumbers are primarily water (about 95%), which makes them a useful hydration tool on hot days or during calorie restriction when thirst can sometimes be confused with hunger. Their coolness and high water content help manage appetite between meals.
For practical use, cucumber slices are a go-to vehicle for hummus, guacamole, or cottage cheese. Sliced cucumber in water adds light flavor without calories. In salads, cucumbers add volume and crunch that makes portions feel larger.
Dietary Considerations
Cucumber is keto-friendly at 2.2g carbs per 100g with minimal impact on ketosis. It is excellent for weight loss at 10 cal/100g and near-zero calorie density. It is vegan, gluten-free, and dairy-free. The very low sodium (2mg per 100g) is ideal for low-sodium diets. No macros of concern for any dietary approach.
Daily Intake (100g)
100g of cucumber provides 1% of a 2,000-calorie diet.
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Frequently Asked Questions
How many calories in a cucumber?
A medium cucumber (201g) contains 20.1 calories. Per 100g, cucumber has 10 calories. A cup of sliced cucumber (119g) has about 11.9 calories. Cucumber is one of the lowest-calorie vegetables available.
Is cucumber good for weight loss?
Yes, cucumber is excellent for weight loss. At 10 calories per 100g and about 95% water, it provides volume and hydration for almost no caloric cost. Adding cucumber to meals and snacks helps fill plates and reduce hunger without impacting your calorie deficit.
Is cucumber keto?
Yes, cucumber is keto-friendly with only 2.2g of carbs per 100g and 0.7g of fiber. Net carbs are about 1.5g per 100g. You can eat large amounts without coming close to your daily carb limit.
Does cucumber have nutritional value?
While low in most nutrients due to its high water content, cucumber provides vitamin K (7.2mcg per 100g), potassium (136mg per 100g), and folate (14mcg per 100g). Its main value is calorie-free volume, hydration, and crunch rather than dense micronutrient content.
Is cucumber a vegetable or a fruit?
Botanically, cucumber is a fruit (it develops from a flower and contains seeds). Nutritionally and culinarily, it is treated as a vegetable. For nutrition and calorie tracking purposes, it is categorized as a vegetable.
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