A typical cucumber is very low in calories: roughly 12–16 calories per 100 g, depending on variety and whether the peel is included.

Quick Scoop: Key Numbers

  • Per 100 g: about 12–16 kcal.
  • One medium cucumber (around 200 g): about 20–30 kcal.
  • Snack cucumber: roughly 3 kcal per small piece.

So if you eat an entire medium cucumber, you’re usually only looking at something like the calories in a couple of bites of bread, but with lots of water and a bit of fibre and micronutrients.