Calories in Cucumber
Per ½ medium, 150 g
Cucumber has 23 calories per ½ medium, 150 g. That is about 1% of a 2,000-calorie day. The same serving provides 1.0 g of protein, 5.4 g of carbohydrate, 0.2 g of fat and 0.8 g of fibre. Per 100 g, that works out at 15 calories and 0.7 g of protein. Against the thresholds EU food labelling uses, it qualifies as a source of protein, fat free and low energy. Almost all water — useful for adding volume to a plate for essentially nothing.
Calories and macros
| Per ½ medium, 150 g | Serving | Per 100 g | % of daily intake |
|---|---|---|---|
| Calories | 23 kcal | 15 kcal | 1% |
| Protein | 1.0 g | 0.7 g | 2% |
| Carbohydrate | 5.4 g | 3.6 g | 2% |
| Fat | 0.2 g | 0.1 g | 0% |
| Fibre | 0.8 g | 0.5 g | 3% |
Daily intake percentages use the EU reference intakes an average adult label is based on: 2,000 kcal, 50 g protein, 260 g carbohydrate, 70 g fat, 30 g fibre.
What this is good for
These are the nutrition claims this food would qualify for under EU labelling rules — thresholds, not opinions.
Worth knowing
Figures are for a typical example and will vary by brand, ripeness and how it was cooked. For a target of your own, run the calorie calculator or take the short quiz. To log this without doing the arithmetic, Joules is free.
Figures last reviewed 29 August 2026.
Common questions about a cucumber
How many calories are in a cucumber?
Cucumber has 23 calories per ½ medium, 150 g, which is about 1% of a 2,000-calorie day.
How many calories are in 100 g of cucumber?
100 g of cucumber contains 15 calories.
How much protein is in a cucumber?
One serving of ½ medium, 150 g provides 1.0 g of protein — 0.7 g per 100 g, or 2% of the 50 g daily reference intake.
How many carbs are in a cucumber?
One serving of ½ medium, 150 g contains 5.4 g of carbohydrate, of which 0.8 g is fibre.
What is a cucumber a good source of?
Measured against EU food labelling thresholds, cucumber qualifies as a source of protein, fat free and low energy. At least 12% of its calories come from protein. Under 0.5 g of fat per 100 g. Under 40 calories per 100 g — a lot of food for very little.