How Many Calories Are In 1 Cucumber? | Quick Facts Guide

Calories In A Whole Cucumber By Size

Here’s the plain math most shoppers want. Lab data place raw cucumber with peel at 16 calories per 100 grams, with water around 96% of weight. Peeled versions run even lighter per gram. Serving weights vary, so it helps to translate those numbers into everyday portions with clear ranges.

Quick Reference Table (Early, Broad, In-Depth)

This early table pulls common forms and translates them to simple calorie estimates. We round to keep it practical for meal planning.

Form Or Serving	Typical Weight	Calories
Raw, With Peel	100 g	~16 kcal
Peeled, Chopped (1 cup)	133 g	~13 kcal
Peeled, Sliced (1 cup)	119 g	~12 kcal
One Medium, Peeled	~201 g	~20 kcal
One Medium, With Peel	~200 g	~30–32 kcal
Mini/Persian (each)	~80–120 g	~8–19 kcal

Those ranges come straight from lab-sourced nutrition databases that publish serving weights and per-100-gram values. If you track intake, setting your daily calorie needs first gives context to where cucumbers fit in your day.

Why Cucumbers Are So Low In Calories

The energy count is tiny because cucumbers are mostly water. With peel, the measured water content sits near 96% per 100 grams. That leaves only a few grams of carbohydrate and trace fat or protein. The same water density helps with volume: a bowl of slices looks large while delivering minimal energy.

Peel On Vs. Peeled

Leaving the peel adds a small bump in calories per gram and a bigger bump in vitamin K. Peeling trims a few calories and softens texture. If you want crunch for salads, keep the peel on. If you want the lightest count with a milder taste, peel it before slicing.

Seeded Vs. Seedless

English and Persian types have smaller, softer seeds. The calorie difference is minor. The bigger change is texture and bitterness. Choose the type that matches your dish; the energy gap will be small either way.

Serving Sizes You’ll See On Labels

Packaged produce follows U.S. serving-size rules called RACC. For vegetables, those rules set the reference amount per eating occasion so labels are consistent. If you’re comparing cups on a label to grams on a scale, that’s why the volumes look standardized. See the FDA’s guide to reference amounts in this industry document for clarity on serving math: Reference Amounts Customarily Consumed.

How To Estimate Calories Without A Scale

You don’t need lab gear to stay accurate. Use the visual cues below and round to the nearest whole number. The goal is consistency from day to day, not lab-grade precision.

Handy Rules

• One packed cup of peeled chopped pieces (~133 g) lands near 13 kcal.
• One packed cup of peeled slices (~119 g) sits near 12 kcal.
• One medium peeled unit (~201 g) lands near 20 kcal. With peel of similar size, expect near 30 kcal.
• Half a standard unit with peel comes in near 15 kcal.

When Water Weight Shifts The Count

Draining salted slices or letting salad sit can reduce water. The count per cup rises when water drains off, since the pieces pack tighter. For the most consistent logging, weigh once, save that look as your personal reference, and match it next time.

Nutrition Beyond The Calorie Count

You get small amounts of potassium, vitamin K, and a little vitamin C. The mineral numbers are modest per serving, yet the water content adds a hydration boost to meals. Public health guidance notes that foods with high water content contribute to fluid intake during the day, which helps on hot days and busy schedules. See the CDC’s page on water and healthier drinks for plain-spoken context on fluids from foods and beverages: water and healthier drinks.

Smart Pairings For Meals

• Protein plate: Pile slices next to eggs, grilled fish, or beans to add volume without pushing calories up.
• Crunch factor: Swap chips for spears with a yogurt dip. You’ll get more bites for a tiny energy cost.
• Soup base: Blend with herbs, garlic, and a spoon of olive oil for a chilled bowl that stays light.
• Salad upgrade: Layer ribbons with tomatoes and red onion; finish with lemon and a pinch of salt.

Method Notes: Where These Numbers Come From

Values here come from lab databases that source their data from USDA FoodData Central. With peel, the base figure is 16 kcal per 100 g with water near 96%. Peeled entries list standard serving weights such as 1 cup chopped at 133 g and 1 medium at 201 g. From there, the per-serving calories are simple multiplication and rounding. That’s why you’ll see neat, user-friendly numbers like 12–13 kcal per cup peeled and ~20 kcal for one medium peeled unit. For the with-peel medium, ~30–32 kcal reflects the 16-per-100-gram baseline and typical weights near 200 g.

How This Helps With Weight Goals

Meals feel bigger when you add produce that’s mostly water. Slices stretch sandwiches and bowls, giving you more chew time and fewer calories per bite. If you’re building a lighter day, place a big portion of cucumbers and other watery vegetables next to the items that carry most of your energy. That shift lets you stay satisfied while keeping totals steady.

Snack Swaps That Work

• Swap crackers: Try spears with salsa or hummus. You keep the dip and cut the starch load.
• Late-night plate: Make a quick salad with lemon, dill, and a drizzle of olive oil.
• Sushi night: Add extra cucumber to rolls or bowls for bulk without moving the needle much.

Prep Tips That Keep Counts Consistent

Slice Size

Thinner slices pack tighter in a cup. If you log by cups, slice the same way each time. If you log by grams, the slice thickness won’t matter.

Salt And Drain

Salting pulls water out. You’ll see less liquid in the bowl and more pieces per scoop. The gram count stays the same; the cup count changes. If you salt often, measure by weight for accuracy.

Peel Choices

Peeling trims a few calories and softens bite. Keeping the peel adds a bit of vitamin K and a snappier texture. Pick the version that fits your dish and your day.

Later Reference Table (Focused, After 60%)

Use this second table to plan portions across common dishes. It sticks to three fast columns to stay scannable.

Dish Or Use	Serving Guide	Estimated Calories
Salad Bowl Base	2 cups peeled slices (~238 g)	~24 kcal
Snack Sticks	1 heaping cup (~140 g)	~14 kcal
Chilled Soup	1 medium peeled (~201 g)	~20 kcal
Sandwich Add-On	10–12 thin rounds (~80 g)	~8–13 kcal
Dip Platter	1 large with peel (~250 g)	~40 kcal

FAQs You Don’t Need

You already have the numbers and the method. Grab the baseline per 100 grams, note your usual serving, and you’re set. If a diet app shows a slightly different total, check whether it assumes peel on or off and which cup style it uses. Minor shifts come from water and slice size, not sugar or fat spikes.

Bottom Line For Your Plate

Use cucumbers when you want volume, crunch, and a small calorie footprint. Pair them with protein, herbs, acid, and a little fat for a balanced dish. Want a deeper primer on light grocery picks? Try our low calorie foods.

Sources

Primary figures in this piece are drawn from lab-based entries that mirror USDA FoodData Central and list exact serving weights and water content. See detailed pages for raw cucumber with peel and peeled servings at MyFoodData. Fluid context comes from U.S. public-health guidance on beverages and foods that contribute to daily water intake. Industry serving-size rules are defined in FDA guidance for reference amounts.