Cucumber glycemic index
Cucumber has no measurable glycemic index: a 80 g serving (1 side portion) has only 2.5 g of available carbohydrate, so its glycemic load is about 0 and it barely raises blood sugar on its own.
- Serving80 g
- Available carbs2.5 g
- Fiber0.4 g
- Sugars1.3 g
- Protein0.5 g
- Calories12 kcal
Serving: 1 side portion.
What to know
Cucumber is about 95% water with very little carbohydrate, so its glycemic load is essentially zero.
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Frequently asked questions
Does cucumber have a glycemic index?
Not a measurable one. GI can only be tested in foods with enough carbohydrate: the test needs a 25 or 50 g carbohydrate portion. Cucumber has 3.1 g per 100 g, so its direct effect on blood sugar is minimal and its glycemic load is about 0.
Does cucumber raise blood sugar?
Barely, on its own. What matters more is what you eat it with: bread, rice, potatoes, sauces or sugary drinks. Pairing carbohydrate foods with protein, fat or fiber tends to soften the rise.
How many carbs are in cucumber?
A 80 g serving has about 2.9 g of total carbohydrate, including 0.4 g of fiber, leaving 2.5 g of available carbohydrate (the part that raises blood sugar). Per 100 g: 3.6 g of carbohydrate.
Nutrition facts
| per 100 g | Serving (80 g) | |
|---|---|---|
| Calories | 15 kcal | 12 kcal |
| Carbohydrates | 3.6 g | 2.9 g |
| Available carbs | 3.1 g | 2.5 g |
| Fiber | 0.5 g | 0.4 g |
| Sugars | 1.7 g | 1.3 g |
| Protein | 0.7 g | 0.5 g |
| Fat | 0.1 g | 0.1 g |
Source: USDA FoodData Central, Cucumber, with peel, raw (SR Legacy, FDC 168409). Available carbohydrate = total carbohydrate minus fiber.
Sources: Atkinson FS, Brand-Miller JC, Foster-Powell K, Buyken AE, Goletzke J. International tables of glycemic index and glycemic load values 2021: a systematic review. Am J Clin Nutr. 2021;114(5):1625–1632. USDA FoodData Central. How we calculate each value: Methodology & sources.
Data last reviewed 2026-09-29.