Radishes are a crisp, low-calorie root vegetable that adds a peppery bite to salads, tacos, and crudité platters. While they are not a significant protein source, knowing their exact protein content helps you track your daily macronutrient intake accurately, especially if you follow a plant-based or calorie-conscious diet. This calculator lets you estimate the protein in radishes based on the amount you plan to eat, with flexible unit options and a quick reference for common serving sizes.
Whether you're meal prepping, logging food in a nutrition app, or simply curious about the nutritional profile of this crunchy vegetable, this tool provides a fast, reliable estimate. You can enter your serving in grams, ounces, cups, or whole radishes, and the calculator will return the protein content along with a breakdown of calories and other key nutrients. Use the preset buttons for common portions like a single radish or a standard cup to save time.
🥕 Radish Protein Calculator
📊 Step-by-step
How to Use This Tool
Enter the amount of radishes you plan to eat in the input field, then select the matching unit from the dropdown. The calculator accepts grams, ounces, cups of chopped radish, or whole medium radishes. If you're not sure about the weight, use the quick-fill buttons for common portions: one medium radish, one cup of chopped radish, 100 grams, or 3.5 ounces (about 100 grams). After clicking "Calculate Protein," you'll see the protein content along with estimated calories, carbohydrates, and fiber for that serving. The step-by-step breakdown shows exactly how the numbers were derived, which is handy if you want to verify the math or adjust for your own tracking.
For meal planning, you can use this tool to compare radishes with other low-calorie vegetables. For example, if you're building a salad and want to know how much protein you're getting from the vegetables alone, this calculator gives you a precise figure. Remember that radishes are mostly water and fiber, so their protein contribution is small—but every gram counts when you're tracking macros closely.
Nutritional Profile of Radishes
Radishes (Raphanus sativus) are a root vegetable belonging to the Brassicaceae family, which also includes broccoli, cabbage, and kale. They are prized for their crisp texture and peppery flavor, which comes from compounds called glucosinolates. Nutritionally, raw radishes are about 95% water, making them extremely low in calories—roughly 16 calories per 100 grams. They provide a modest amount of vitamin C (about 14% of the Daily Value per 100 g), some potassium, and a small amount of folate.
In terms of macronutrients, 100 grams of raw radishes contain approximately 0.68 grams of protein, 3.4 grams of carbohydrates, and 1.6 grams of fiber. The protein is incomplete, meaning it lacks some essential amino acids, but it still contributes to your daily intake. Because radishes are so low in calories and protein, they are often used as a crunchy, hydrating snack or a salad ingredient rather than a primary protein source. If you're following a high-protein diet, you'll want to pair radishes with protein-rich foods like beans, tofu, or lean meats.
How the Calculation Works
The calculator uses standard USDA nutrient data for raw radishes. The key conversion factors are:
- 1 medium radish ≈ 4.5 grams
- 1 cup of chopped radishes ≈ 116 grams
- 1 ounce = 28.3495 grams
Once your input is converted to grams, the calculator multiplies by the nutrient density per gram:
- Protein: 0.0068 g per gram of radish (0.68 g per 100 g)
- Calories: 0.16 kcal per gram (16 kcal per 100 g)
- Carbohydrates: 0.034 g per gram (3.4 g per 100 g)
- Fiber: 0.016 g per gram (1.6 g per 100 g)
These values are based on the USDA FoodData Central entry for raw radishes. The calculation is straightforward: multiply the weight in grams by the nutrient factor. For example, 150 grams of radish would contain 150 × 0.0068 = 1.02 grams of protein.
Worked Examples
Example 1: Snack serving
You eat 10 medium radishes as a snack. Each radish weighs about 4.5 g, so total weight = 10 × 4.5 = 45 g. Protein = 45 × 0.0068 = 0.31 g. Calories = 45 × 0.16 = 7.2 kcal. This is a negligible protein contribution, but the radishes add crunch and hydration.
Example 2: Salad ingredient
You add 1 cup of chopped radishes (116 g) to your salad. Protein = 116 × 0.0068 = 0.79 g. Calories = 116 × 0.16 = 18.6 kcal. This is still low, but combined with other vegetables and a protein source like chickpeas, your salad becomes more balanced.
Example 3: Weight-based tracking
You weigh out 200 g of radishes for a meal. Protein = 200 × 0.0068 = 1.36 g. Calories = 200 × 0.16 = 32 kcal. This shows that even a large serving of radishes has minimal impact on your daily protein target.
Tips for Accurate Tracking
- Weigh radishes raw, as cooking can change water content and nutrient density.
- If you use a food scale, enter the weight in grams for the most precise result.
- For whole radishes, the average weight varies by size; our 4.5 g per radish is a reasonable estimate for medium ones. Small radishes may be 3 g, large ones 6 g or more.
- When logging in a nutrition app, remember that the protein value is for raw radishes. If you cook them, the protein content per gram may change slightly due to water loss, but the total protein in the serving remains roughly the same.
- Radishes are often eaten raw, but they can also be roasted or pickled. Pickled radishes may have added sugar or salt, which affects calories and sodium, but not protein significantly.
Frequently Asked Questions
Are radishes a good source of protein?
No, radishes are very low in protein. A 100-gram serving provides only about 0.68 grams, which is less than 1% of the Daily Value for protein (50 g). They are best used for their crunch, flavor, and low-calorie bulk, not as a protein source.
Can I eat radishes on a low-carb diet?
Yes, radishes are relatively low in carbs. A 100-gram serving has about 3.4 grams of carbohydrates, of which 1.6 grams are fiber, leaving about 1.8 grams of net carbs. This makes them suitable for keto and other low-carb diets.
Do radishes lose protein when cooked?
Cooking can cause some water loss, which concentrates nutrients per gram, but the total protein in the serving remains essentially the same. The protein content per 100 grams may appear higher after cooking because water is removed, but the actual protein amount you consume is unchanged.
How do radishes compare to other vegetables in protein?
Most vegetables are low in protein. For comparison, broccoli has about 2.8 g per 100 g, spinach about 2.9 g, and kale about 4.3 g. Radishes are on the lower end, similar to cucumbers and lettuce.
Reference Data
| Serving | Weight (g) | Protein (g) | Calories |
|---|---|---|---|
| 1 medium radish | 4.5 | 0.03 | 0.7 |
| 1 cup chopped | 116 | 0.79 | 18.6 |
| 100 g | 100 | 0.68 | 16 |
| 3.5 oz (approx 100 g) | 99.2 | 0.67 | 15.9 |
Data source: USDA FoodData Central. For more detailed nutrient information, visit the USDA FoodData Central website.