Cucumber is not high in fiber. A whole raw cucumber with the peel contains roughly 1.5 grams of dietary fiber, which is about 5% of the 28-gram daily value set by the FDA. Compared to most vegetables, cucumber sits near the bottom of the fiber rankings. That said, it still plays a useful role in a balanced diet for other reasons.
How Much Fiber Is in a Cucumber
Raw cucumber with the peel provides about 1.14 grams of total dietary fiber per 100 grams. Since a typical whole cucumber weighs around 300 grams, you’d get roughly 3.4 grams from eating the entire thing, though most people eat half that in a sitting. For context, one cup of boiled broccoli delivers 5 grams of fiber, and even a single medium carrot has 1.5 grams packed into a much smaller portion.
The fiber in cucumber is mostly insoluble. USDA data shows about 0.94 grams of insoluble fiber and just 0.20 grams of soluble fiber per 100 grams. Insoluble fiber is the kind that adds bulk to stool and helps keep things moving through your digestive system. Soluble fiber, the type that slows digestion and can help with blood sugar and cholesterol, is present in cucumber only in trace amounts.
Why Cucumber Still Feels Filling
If cucumber is so low in fiber, why does it seem to satisfy hunger reasonably well in salads and snacks? The answer is water. Cucumber is about 95% water by weight, which gives it very high volume for very few calories. A whole cucumber has only about 45 calories. Foods with high water content and some fiber create volume in your stomach, which can trigger fullness signals even without a heavy calorie load.
Research on low-energy-density eating patterns supports this idea: meals with more water and fiber tend to reduce overall calorie intake for some people over time. Cucumber works well as a vehicle for that effect, not because of its fiber content specifically, but because of the sheer volume of food you can eat for minimal calories. Pairing cucumber with higher-fiber foods like hummus, beans, or whole grain crackers makes the combination more effective for satiety.
Where Cucumber Ranks Among Vegetables
To put cucumber’s fiber content in perspective, here’s how it compares to other common vegetables:
- Broccoli (1 cup, cooked): 5.0 grams of fiber
- Green peas (1 cup, cooked): roughly 8 to 9 grams of fiber
- Carrot (1 medium, raw): 1.5 grams of fiber
- Cucumber (1 cup sliced, raw): about 0.5 to 0.7 grams of fiber
Cucumber consistently falls at the low end. This makes sense when you consider how much of it is water. Vegetables with more plant cell structure and less water, like broccoli, Brussels sprouts, and artichokes, pack far more fiber per serving.
The Peel Makes a Difference
Most of cucumber’s fiber lives in the skin. Peeling a cucumber removes a significant portion of both the insoluble fiber and several micronutrients, including vitamin K and small amounts of potassium. If you’re eating cucumber partly for its fiber, leaving the peel on is worth it. A quick wash is all that’s needed for conventionally grown cucumbers, or you can buy organic if pesticide residue on the skin concerns you.
How to Get More Fiber From Cucumber-Based Meals
Cucumber works best as a base or a supporting ingredient rather than a fiber source on its own. In salads, combining it with chickpeas, quinoa, or leafy greens dramatically increases the fiber content of the meal. In smoothies, adding seeds like chia or flax alongside cucumber boosts fiber while keeping the calorie count moderate. Blending does break down some plant cell structure, but it doesn’t remove fiber from the drink.
If your goal is to hit the 28-gram daily value for fiber, cucumber alone won’t get you far. You’d need to eat roughly 2.5 kilograms of cucumber (about eight whole cucumbers) to reach that target. A more practical approach is to enjoy cucumber for what it does well: adding hydration, crunch, and volume to meals that include other fiber-rich ingredients.