How many calories are in a cucumber?

A whole cucumber of about 300 g has around 45 kcal.

Does cucumber count as one of your 5 a day?

Yes. An 80 g portion, about a 5 cm chunk, counts as one portion.

Calories in cucumber

Cucumber is about 95% water, with only 15 kcal per 100 g. A whole cucumber is about 45 kcal.

By the Calori team · Updated 21 October 2026 · 3 min read

Cucumber calories by portion

Portion	Calories	Protein	Carbs	Fat
5 cm piece (60 g)	9 kcal	0.4 g	1.9 g	0.1 g
Half a cucumber (150 g)	23 kcal	1 g	4.7 g	0.2 g
Whole cucumber (300 g)	45 kcal	2.1 g	9.3 g	0.3 g

Cucumber nutrition per 100 g

Energy	15 kcal (63 kJ)
Protein	0.7 g
Carbohydrate	3.1 g
of which sugars	1.7 g
Fat	0.1 g
Fibre	0.5 g

Typical values. Carbohydrate excludes fibre, as on UK food labels. Brands and varieties differ, so check the label where there is one.

Cucumber for weight loss

Cucumber adds crunch and volume to meals and snacks for almost no calories. Pair it with cottage cheese, hummus or tzatziki for a more filling snack.

Log it without looking it up

Calori recognises foods like this from a photo and estimates the portion, so you can log a whole plate in one go. Set your daily target with our calorie calculator.

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Frequently asked questions

How many calories are in a cucumber?: A whole cucumber of about 300 g has around 45 kcal.
Does cucumber count as one of your 5 a day?: Yes. An 80 g portion, about a 5 cm chunk, counts as one portion.