Radishes are a crisp, peppery root vegetable with a very low energy density and a surprisingly useful nutrient profile for their small size. This Radish Nutrition Calculator estimates calories, macronutrients, fiber, and key micronutrients in raw radishes based on the serving size you enter. It works with grams, ounces, whole medium radishes, or cups of sliced radish, so you can log a precise serving without guessing.
Enter your serving, choose a unit, and press Calculate. You will get calories, protein, carbohydrates, fiber, sugars, and fat, plus optional vitamin C, potassium, folate, and calcium values. The calculator uses USDA FoodData Central reference values for raw radishes per 100 g, making it a helpful companion for calorie tracking, meal planning, and everyday healthy eating.
Whether you are counting macros, following a low-calorie eating pattern, or just curious about the nutrition in a salad topping, this tool delivers instant, evidence-based numbers for casual snackers, nutrition students, and dietitians alike.
🧮 Enter Your Serving
📊 Nutrition Breakdown
| Nutrient | Amount |
|---|---|
| Calories | |
| Protein | |
| Carbohydrates | |
| Fiber | |
| Sugars | |
| Fat |
Micronutrients
| Vitamin C | |
| Potassium | |
| Folate | |
| Calcium |
How to Use This Tool
The calculator works with four common ways of describing a radish serving. Start by entering a quantity in the input box, then pick the matching unit from the dropdown. Press Calculate to see the full nutrition breakdown, or press Reset to return to the default 100 g serving.
- Grams (g): best for kitchen scales and food diary apps. Type the exact weight you logged.
- Ounces (oz): handy when a recipe or packaged produce label lists weights in ounces. One ounce equals 28.35 g.
- Medium radishes: useful for snacking. The calculator assumes one medium raw radish weighs about 9 g, the average used by the USDA for raw radish roots.
- Cups, sliced: convenient for salads and crudité platters. One cup of sliced raw radish is estimated at 116 g.
The micronutrient checkbox lets you hide or show values for vitamin C, potassium, folate, and calcium. Keep it on when tracking specific nutrients; switch it off for a cleaner macro-only readout.
How the Calculation Works
This tool uses reference values published by the USDA FoodData Central for raw radish roots (Raphanus sativus). Every nutrient is stored as a per-100-gram value, so the math is simple and transparent:
Step 1. Convert your serving to grams. For example, 4 oz × 28.35 = 113.4 g.
Step 2. Compute the scale factor: grams ÷ 100. Here, 113.4 ÷ 100 = 1.134.
Step 3. Multiply each per-100 g nutrient by the scale factor. Calories: 16 × 1.134 ≈ 18.1 kcal. Vitamin C: 14.8 × 1.134 ≈ 16.8 mg.
The result panel shows the estimated nutrition for your exact portion, including a compact three-line breakdown of the conversion, the scale factor, and the calorie math — handy for verifying numbers or explaining them to a client, patient, or class.
Worked Examples
Example 1: A snack of 5 medium radishes. Five medium radishes weigh about 5 × 9 = 45 g. Scale = 45 ÷ 100 = 0.45. Calories = 16 × 0.45 = 7.2 kcal. Protein = 0.68 × 0.45 ≈ 0.31 g. Vitamin C = 14.8 × 0.45 ≈ 6.7 mg.
Example 2: A large salad topping of 1.5 cups. 1.5 cups of sliced radish weighs about 1.5 × 116 = 174 g. Scale = 1.74. Calories = 16 × 1.74 ≈ 27.8 kcal. Fiber = 1.6 × 1.74 ≈ 2.8 g. Potassium = 233 × 1.74 ≈ 405 mg.
Radish Nutrition at a Glance
Raw radishes are more than a crunchy garnish. A 100 g serving provides only about 16 calories, 3.4 g of carbohydrates, 1.6 g of fiber, and 14.8 mg of vitamin C — roughly 16% of the daily value for an adult. Radishes are also about 95% water, which explains their very low energy density and their popularity in weight-management meal plans.
Reference Values per 100 g
| Nutrient | Amount per 100 g | % Daily Value |
|---|---|---|
| Calories | 16 kcal | — |
| Protein | 0.68 g | 1% |
| Carbohydrates | 3.40 g | — |
| Fiber | 1.6 g | 6% |
| Sugars | 1.86 g | — |
| Fat | 0.10 g | — |
| Vitamin C | 14.8 mg | 16% |
| Potassium | 233 mg | 5% |
| Folate | 25 mcg | 6% |
| Calcium | 25 mg | 2% |
Percent Daily Values are based on a 2,000-calorie adult diet using FDA labeling guidance; individual needs vary by age, sex, and activity level. Source: USDA FoodData Central, raw radish roots.
Common Questions
Are radishes keto-friendly? Yes. With about 3.4 g of total carbohydrates and 1.6 g of fiber per 100 g, net carbs are roughly 1.8 g, which fits easily into strict low-carb plans.
Do these values apply to cooked radishes? No. This calculator is for raw radish roots. Cooking causes moisture loss and slightly alters nutrient values, so use a dedicated database entry if you track roasted or sautéed radishes.
How accurate are the numbers? The values come from the USDA's national reference database, which averages samples across varieties and growing regions. Individual radishes vary, so treat the results as solid estimates rather than laboratory-level precision. Weighing your serving is always more accurate than counting pieces or measuring cups.
Can I use this for daikon radishes? The values are specific to common red breakfast radishes. Daikon has a different water and nutrient profile and needs its own database entry if you eat it regularly.
Why do radishes have so few calories? Their high water content and modest sugar content mean even a generous handful adds crunch and color for a tiny calorie cost. Pair this tool with the Daily Calorie Calculator to see how radishes fit into your total energy needs.
Tips for Accurate Tracking
- Weigh radishes on a kitchen scale for the most precise log — piece counts and cup measures vary noticeably.
- Trim the root and leaves before weighing the portion you actually eat.
- If you log meals in an app, search for "radishes, raw" and check that the serving size matches your grams.
- Remember that dips, butter, and salad dressing add calories this tool does not include.
Further Reading
For deeper details on radish composition, look up USDA FoodData Central; for background on the vitamin C contribution, see the NIH Vitamin C Fact Sheet for Health Professionals.