Quick Answer: 100g of cucumber (with peel) is about 15 calories and equals roughly 0.84 cup sliced, since a cup of sliced cucumber weighs around 119g. That same 100g is about 95% water, with 3.6g of carbs and 0.5g of fiber. Use the calculator below to convert grams and cups.
Cucumber: Cups ↔ Grams Calculator
Type in either box — the other updates automatically. Thinner slices pack more tightly, so weight per cup can shift by 10–15g.
100g of Cucumber: Quick Reference Table
| Amount | Weight | Calories |
|---|---|---|
| 1/4 cup sliced | ~30g | ~4 kcal |
| 1/2 cup sliced | ~60g | ~9 kcal |
| 100g | 100g | ~15 kcal |
| 1 cup sliced | ~119g | ~18 kcal |
| 1 medium cucumber | ~300g | ~45 kcal |
Cucumber is one of the least calorie-dense foods you can eat by weight. Keep reading for the full nutrition breakdown, how peeling changes things, and how cucumber compares with other salad vegetables.
100g of Cucumber: Full Nutrition Facts
| Nutrient | Amount per 100g |
|---|---|
| Calories | ~15 kcal |
| Water | ~95% |
| Carbohydrates | ~3.6g |
| Fiber | ~0.5g |
| Protein | ~0.65g |
| Fat | ~0.1g |
| Potassium | ~147mg |
| Vitamin K | ~16mcg |
That water content is the headline feature. It’s why cucumber is one of the best “volume eating” foods: you can eat several cups of it for well under 100 calories, which makes it a common choice for people watching their intake without feeling deprived, similar to how raw carrots deliver crunch and volume for relatively few calories.
With Peel vs Peeled: Does It Matter?
The difference is small. Peeled cucumber runs slightly lower in calories and fiber, since most of the fiber and vitamin K sit in and just under the skin, but the gap is only a calorie or two per 100g. English or Persian cucumbers have thin, mild skins that most people eat without peeling, while thicker-skinned varieties sold with a wax coating are worth washing well or peeling if the bitterness bothers you.
How Cucumber Compares to Other Salad Vegetables
At 15 calories per 100g, cucumber sits at the low end even among low-calorie vegetables. It has less fiber and fewer nutrients per gram than something like spinach, but its high water content makes it uniquely good for hydration and bulk in a salad. Pairing a water-dense vegetable like cucumber with a more nutrient-dense one is a common way to build a filling, low-calorie plate.
Frequently Asked Questions
About 15 calories, most of it coming from carbohydrates, since cucumber is roughly 95% water.
About 0.84 cup sliced, since a full cup of sliced cucumber weighs approximately 119g.
Only a small amount. Peeled cucumber has slightly less fiber and vitamin K than cucumber with the skin on, but the calorie difference is negligible.
A medium cucumber weighs about 300g, or roughly 45 calories.
Yes, at about 95% water it is one of the more hydrating vegetables, though it should support rather than replace regular water intake.
Final Answer: How Much Is 100g of Cucumber
100g of cucumber is about 15 calories and roughly 0.84 cup sliced, made up of about 95% water with small amounts of carbs, fiber, and potassium. Whether you peel it or not makes only a minor nutritional difference. Since cucumber packs so few calories into so much volume, weighing it is mainly useful for consistency in a recipe rather than for calorie control.