Radishes are one of the lowest-calorie crunchy vegetables around, which makes them a favorite for snackers, salad lovers, and anyone tracking daily calories. Because radish serving sizes vary widely — from a single small root to a full cup of slices — it can be surprisingly easy to underestimate or overestimate what you are actually eating. This radish calories per ounce calculator takes the guesswork out by converting your serving into grams and then calculating calories, net carbs, fiber, protein, and fat using standard nutrition data for raw radishes.
Use it when you are meal-prepping a vegetable tray, logging a salad, or comparing radishes with other low-calorie snacks. You can enter your portion in ounces, grams, cups of sliced radish, or whole medium/large radishes, and even adjust the calorie density if you are using a specific product label. The result includes a per-ounce figure so you can quickly compare radishes with other foods on a calorie-per-ounce basis. For broader daily planning, pair this with our daily nutrition target calculator.
🥗 Radish Calorie Calculator
Estimate calories, carbs, fiber, protein, and fat in any serving of raw radish.
How This Calculator Works
Raw radishes are about 95% water, which is why they are so low in energy. Standard USDA data lists raw radishes at roughly 16 kilocalories per 100 grams (USDA FoodData Central). This calculator uses that value as the default and converts your serving into grams using these weight equivalents: 1 ounce = 28.35 g, 1 cup of sliced radish = 116 g, 1 medium radish = 4.5 g, and 1 large radish = 9 g. Once the weight is known, the calorie estimate is simply weight × (calories per 100 g ÷ 100).
Macronutrient estimates are based on typical raw radish composition: about 3.4 g total carbohydrate, 1.6 g fiber, 0.68 g protein, and 0.1 g fat per 100 g. Because fiber is not digested like other carbs, the calculator also shows net carbs (total carbs minus fiber), which is useful for low-carb and keto meal planning. If you are using a specific brand or product label, open the optional density field and enter the exact kcal per 100 g from the package; the same serving-size logic still applies. For a more complete look at vitamins and minerals, pair this with our radish nutrition calculator.
Step-by-Step Example
Suppose you want to know what 3 ounces of sliced radish provides. The calculator first converts 3 oz to grams: 3 × 28.35 = 85.05 g. At 16 kcal per 100 g, the calorie per gram is 0.16, so the total is 85.05 × 0.16 = 13.6 kcal. That is about the same as one small celery stalk or a few cucumber slices.
Weight = 116 g
Calories = 116 × 0.16 = 18.6 kcal
Total carbs = 116 × 0.034 = 3.9 g
Fiber = 116 × 0.016 = 1.9 g
Net carbs = 3.9 − 1.9 = 2.1 g
Protein = 116 × 0.0068 = 0.8 g
Fat = 116 × 0.001 = 0.1 g
Quick Reference: Radish Serving Sizes
Use this table as a fast reference when you do not have the calculator open. The calorie values are rounded to one decimal place and assume 16 kcal per 100 g.
| Serving | Weight | Calories |
|---|---|---|
| 1 small radish | ~2 g | 0.3 kcal |
| 1 medium radish | ~4.5 g | 0.7 kcal |
| 1 large radish | ~9 g | 1.4 kcal |
| 1 cup sliced radish | ~116 g | 18.6 kcal |
| 1 ounce (28.35 g) | 28.35 g | 4.5 kcal |
| 100 g | 100 g | 16 kcal |
Why Radishes Fit Into Low-Calorie Meal Plans
Because radishes provide volume and crunch for very few calories, they are a practical food for people who want to feel full without blowing through their daily energy budget. A whole cup of sliced radish has fewer calories than a single bite of most crackers or chips. The high water content also contributes to hydration while the natural bitterness can add flavor to salads, tacos, and grain bowls, reducing the need for heavy dressings.
There are only a few caution points. The most common calorie mistake is not the radish itself but the dip: two tablespoons of ranch dressing can add 120 kcal, which is more than ten cups of radish slices. Butter, hummus, and creamy dressings change the nutritional picture quickly. For snacking, measure your dip separately and keep the vegetable portion generous. Roasting radishes is another popular option; it softens their peppery flavor and adds browning, but if you toss them in oil before roasting, include the oil in your calorie count.
Common Questions
Are radish calories the same after cooking? Cooking itself does not create or destroy calories, but it changes water content. A roasted radish weighs less because water evaporates, so the same raw weight will have slightly lower post-cooking weight but the calories remain tied to the original dry matter. Weigh cooked radishes as cooked if your log has a cooked entry, or use the raw measurement before roasting.
Are radish greens edible? Yes, radish greens are edible and contain more nutrients per gram than the root. The calories are low, around 20–25 kcal per 100 g raw, so they can be treated as a leafy green. If you eat the greens, log the root and greens separately because their macronutrient profiles differ.
How many carbs are in a radish? A medium radish contains about 0.15 g total carbs and less than 0.08 g net carbs. Even a large bowl of radishes is modest in carbs, which makes them a popular choice for low-carb diets. If you are strict with keto, the net carbs shown in this calculator are the more relevant number.
Why do some nutrition sites show 18 or 19 kcal per 100 g? Different databases use different analytical samples and rounding. Some sources report radish calories as 18 kcal per 100 g after including slightly different moisture or fiber measurements. The difference is tiny — about 1 kcal per cup — so it rarely matters for tracking. Use the value from the food label or database you trust, and stay consistent.
For full macro and micro breakdowns, see nutrition target calculator to see how a radish serving fits your daily energy, protein, and carbohydrate targets. If you are comparing other crunchy vegetables, the per-ounce format in this tool makes it easy to stack radishes against carrots, celery, cucumber, and bell peppers.