Cucumbers are famously refreshing, but when you're tracking daily fiber, it helps to know exactly how much this crunchy vegetable contributes. This cucumber fiber calculator estimates the grams of dietary fiber in any cucumber serving — whether you measure by grams, ounces, cup portions, or whole cucumbers — and converts that into a percentage of the FDA Daily Value.
Based on USDA nutrient data, the tool also reports total carbohydrates and net carbs, making it useful for keto and low-carb meal planning as well as general fiber tracking. Select whether your cucumber is peeled or unpeeled, enter your serving size (or use a quick preset like “1 medium cucumber”), and hit Calculate. The result breakdown shows your fiber per serving, fiber density, and how it fits into a standard 2,000 calorie daily target.
How to Use This Tool
Start by choosing how you are measuring your cucumber. If you weigh your food, type the number of grams or ounces into the amount field and leave the unit set to grams or ounces. If you prefer volume, choose “cup sliced” or “cup chopped”; the calculator uses standard USDA cup weights of about 104 g and 133 g respectively. You can also pick a whole cucumber size — small, medium, or large — and enter how many cucumbers you ate. Then choose whether the cucumber was eaten with the peel or peeled before weighing. Press Calculate Fiber and the result panel will show your fiber grams, percentage of the Daily Value, total carbs, net carbs, and the weight of the serving.
Cucumber Fiber Values Used
Nutrient values are drawn from the USDA FoodData Central reference for raw cucumbers. The exact fiber grams can vary a little by variety, growing conditions, and whether the cucumber is seeded or unseeded, but the values below are the standard figures used for nutrition labeling and diet tracking.
| Preparation | Fiber per 100 g | Total carbs per 100 g | Net carbs per 100 g |
|---|---|---|---|
| Raw cucumber with peel | 0.5 g | 3.63 g | 3.13 g |
| Raw cucumber, peeled | 0.7 g | 2.16 g | 1.46 g |
To put those numbers in perspective, 100 g of cucumber is roughly one-third of a medium cucumber. Fiber is calculated as (serving weight in grams ÷ 100) × fiber per 100 g.
How the Calculation Works
The tool first converts your chosen unit into grams. For example, one “medium cucumber” preset uses an average weight of 200 g, and one large cucumber uses 300 g. It then applies the fiber density for the selected preparation.
Daily Value (%) = fiber ÷ 28 g × 100
The Daily Value uses 28 g as the reference amount for a 2,000-calorie diet, per the FDA’s updated nutrition labeling rules. Net carbs are total carbohydrates minus fiber, a common calculation for low-carb and keto meal plans.
Worked Examples
- 1 medium cucumber with peel (200 g): (200 ÷ 100) × 0.5 = 1.0 g fiber. That is about 3.6% of the 28 g Daily Value.
- 1 cup sliced cucumber with peel (104 g): (104 ÷ 100) × 0.5 = 0.52 g fiber, or 1.9% of the Daily Value.
- 1 large peeled cucumber (300 g): (300 ÷ 100) × 0.7 = 2.1 g fiber, or 7.5% of the Daily Value. Its net carbs are (300 ÷ 100) × (2.16 − 0.7) = 4.38 g.
Tips for Adding More Cucumber Fiber
Leave the peel on whenever possible. The skin holds much of the cucumber’s fiber and provides a firmer texture in salads and sandwiches. Wash the cucumber well and slice it into rounds, spears, or chunks rather than peeling it. You can also:
- Pair cucumber slices with hummus, which adds chickpea fiber and protein.
- Add chopped cucumber to a quinoa or barley salad for a big fiber boost from the grains.
- Stir cucumber into Greek yogurt with chia seeds or flaxseed.
- Use cucumber ribbons in wraps made with whole-grain tortillas.
Frequently Asked Questions
Is cucumber a high-fiber food?
No. Raw cucumber is about 95% water and provides only 0.5–0.7 g of fiber per 100 g. A whole medium cucumber gives you about 1 g of fiber. For comparison, 100 g of raspberries provides roughly 6.5 g. However, cucumber is a low-calorie, hydrating vegetable that makes it easy to increase vegetable variety in your diet.
Does peeling change the fiber content?
In the USDA dataset, peeled cucumber shows a slightly higher fiber value per 100 g because the edible flesh is less diluted by the watery outer peel. In everyday cooking, peeling removes some of the outer fiber and nutrients, so meal planners who want maximum fiber should leave the peel on. The difference per serving is usually less than 0.3 g.
Can cucumbers help with constipation?
Cucumbers contribute fluid and a small amount of insoluble fiber, which can aid regularity when combined with other fiber-rich foods. They are not a constipation remedy on their own. If you are increasing fiber, do it gradually and drink plenty of water.
If you track fiber in other vegetables, these tools can help you compare common portions: bok choy fiber calculator and leek fiber calculator. For official food composition data, consult the USDA FoodData Central, and see the FDA’s Daily Value explanation. A good general overview of dietary fiber is available from the Harvard T.H. Chan School of Public Health.