Cucumbers are 95% water, so it's no surprise they're not a protein powerhouse — but that doesn't mean protein content is irrelevant if you're tracking macros. A 100 g serving of raw, unpeeled cucumber provides roughly 0.65 g of protein, along with a refreshing crunch for salads, snacks, and infused water. This tool converts any amount of cucumber you actually eat — grams, ounces, sliced cups, or whole cucumbers — into its protein equivalent.
Use the calculator to log cucumber more precisely in your food diary, estimate how it fits into your daily protein target, or compare it with other low-calorie vegetables. It's helpful for meal preppers, vegans filling out a plant-heavy plate, and anyone on a calorie or macronutrient budget who wants the numbers behind their veggies.
Just enter the amount, choose a unit, and the result appears instantly — including protein per 100 g and the percentage of your daily protein goal.
🥒 Cucumber Amount
⚙️ Daily Protein Target (optional)
How to Use This Tool
Start by entering how much cucumber you plan to eat in the amount field. Choose the matching unit from the dropdown — grams, ounces, cups of sliced cucumber, or whole medium cucumbers. If you're logging into a calorie app, grams are usually the most accurate; if you're meal prepping by volume, cups are convenient; if you're just eating a cucumber from the fridge, choose "medium cucumbers." You can also set an optional daily protein target in grams, and the calculator will tell you what percentage of that target your cucumber portion covers. Use the preset buttons for common servings like 100 g, 1 cup, or one medium cucumber, then hit "Calculate Protein."
The Math Behind Cucumber Protein
The calculator uses the USDA reference value of 0.65 g of protein per 100 g of raw cucumber with peel. That means every gram of cucumber contributes 0.0065 g of protein. Multiply the weight of your portion by this factor:
Unit conversions used in the tool: 1 oz = 28.3495 g, 1 cup of sliced cucumber ≈ 104 g, and 1 medium cucumber (about 8-1/4 inches long) ≈ 301 g. If your cucumber is larger or smaller than the USDA "medium" size, adjust the amount accordingly or weigh it in grams for the most precise result. Values are based on USDA FoodData Central data for raw cucumber with peel.
Worked Examples
Here's how the math plays out for typical servings:
- 1 cup of sliced cucumber (104 g): 104 × 0.0065 = 0.68 g protein.
- 1 medium cucumber (301 g): 301 × 0.0065 = 1.96 g protein.
- 3 oz of cucumber (85 g): 85 × 0.0065 = 0.55 g protein.
- 100 g of cucumber: 0.65 g protein.
Factors That Affect Accuracy
Several variables can nudge the real protein content up or down. The variety of cucumber matters — English, Persian, and standard garden cucumbers differ slightly in water content and nutrient density. Whether you take the peel off also changes the numbers, since the peel contains a small amount of extra protein and fiber. Seasonal growing conditions, soil, and storage time can create minor variations too. Finally, volume-based measurements are inherently less reliable than weight-based ones: a loosely filled cup of cucumber slices weighs less than a tightly packed one. For meal-prepping or strict macro counting, weigh your cucumber in grams.
None of these differences are large enough to derail a healthy diet, but they explain why the value on your food label might differ by a few hundredths of a gram from this calculator's output.
Frequently Asked Questions
How much protein is in a whole cucumber? A medium cucumber (about 8-1/4 inches) contains roughly 1.96 g of protein when you include the peel. A very large cucumber might reach about 2.5 g.
Is cucumber a good source of protein? Not at all — cucumber is around 96% water and provides only about 0.65 g of protein per 100 g. Its strengths are hydration, low calories, and a refreshing crunch. It contributes a small but useful amount of vitamin K and potassium.
Do I need to log cucumber if it has so little protein? If you're tracking total calories and macros, yes. Small amounts add up, and using a calculator keeps your food diary consistent. For most people, eating cucumber freely without measuring is perfectly fine.
Peeled or unpeeled? The peel adds a little fiber and nutrients, so unpeeled cucumber has a slightly higher protein and micronutrient content. The calculator's default assumes raw cucumber with peel.
See the official USDA FoodData Central entry for cucumber to explore the full nutrient profile: USDA FoodData Central.
Real-World Applications
Cucumber protein tracking is most useful for people following flexible dieting, bodybuilders in a cutting phase, vegans monitoring plant-based protein intake, and anyone building a detailed food diary. It also helps when you're comparing low-calorie vegetables side by side — for example, seeing that cucumber and cantaloupe both provide minimal protein can free you to choose based on taste, texture, and micronutrient goals. If you're calculating how your daily vegetable intake fits into a macro budget, pair this with the protein for weight loss calculator to make sure your overall protein intake is on track.
For more vegetable and fruit macro details, the watermelon protein calculator is another handy reference for high-water produce.