Calories in Cucumber

Data reviewed 2026-09-08 against USDA FoodData Central (SR Legacy).

A 100 g serving of cucumber has about 15 kcal, with 0.7 g of protein, 3.6 g of carbohydrate (0.5 g of that fibre) and 0.1 g of fat. The table below gives the full breakdown and the most common portion sizes.

Nutrition per 100 g

NutrientPer 100 g
Calories15 kcal
Protein0.7 g
Carbohydrate3.6 g
Fibre0.5 g
Sugars1.7 g
Fat0.1 g
Saturated fat0 g
Sodium2 mg
Cholesterol0 mg

Common portions

PortionWeightCalories
cup slices104 g16 kcal
cucumber (8-1/4")301 g45 kcal

Log cucumber in a recipe

To see how cucumber affects a whole dish, drop it into the recipe calorie calculator with the rest of your ingredients — it totals calories, protein, carbs and net carbs for the recipe, per serving and per 100 g. The methodology shows the exact arithmetic.

Frequently asked questions

How many calories are in cucumber?

About 15 kcal per 100 g. Portion calories depend on how much you use — see the portions table above for common amounts.

How much protein is in cucumber?

Cucumber has roughly 0.7 g of protein per 100 g.

Is cucumber keto-friendly?

Its net carbs are about 3.1 g per 100 g (total carbs 3.6 g minus 0.5 g fibre). Whether it fits your day depends on portion size and your carb target.

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