Radish Calories Per Gram Calculator

How to Use This Tool

Using the radish calorie calculator takes only a few seconds. Start by entering the amount of radish you plan to eat in the input box. The unit dropdown lets you switch between four common measures:

• Grams (g) — the most accurate option if you have a kitchen scale; this matches the USDA nutrition database.
• Ounces (oz) — handy for recipes and packaged produce that list weights in ounces.
• Sliced cups — useful for salads and veggie trays where you measure by volume.
• Medium radishes — convenient when you count individual pieces rather than weighing them.

After entering your number, choose whether you also want the macro breakdown (carbs, fiber, protein, and fat) by ticking the “Show macros” checkbox. Then click Calculate Calories. The result card displays the total calorie estimate, the calories per gram for your portion, and the calories per 100 g reference value. A mid-section breakdown gives you the macronutrient totals for your exact portion.

The Math Behind It

Raw radishes are exceptionally low in calories. According to the USDA FoodData Central database, raw radishes contain approximately 16 kcal per 100 grams. That means the calorie-per-gram value is 0.16 kcal/g.

To estimate calories for any portion, the calculator uses this straightforward formula:

For example, a 150 g serving of sliced radish works out to (150 ÷ 100) × 16 = 24 kcal. If you enter an ounce-based portion, the calculator first converts ounces to grams using 1 oz = 28.3495 g, then applies the same calorie-per-gram factor. Volume conversions use average weights from nutrition databases: 1 metric cup of sliced radishes is about 116 g, and one medium radish averages about 9 g.

These conversions matter because radish weights vary with size and water content. A large radish can weigh over 15 g, while a tiny salad radish might weigh only 5 g. The calculator uses a reasonable “medium” estimate of 9 g, but gram-based entry will always give the most reliable result.

Reference Table: Radish Portions and Calories

Use this quick reference to see typical calorie values before you even open the calculator:

Note that these are raw radish values. Cooking radishes, as in roasted or pickled preparations, can change calorie content if oil, sugar, or brine is added. The calculator assumes plain raw radishes.

Nutrition Highlights & Pro Tips

Radishes are a dieter's dream: they are over 95% water and contain almost no fat or sugar. A 100 g serving delivers about 1.6 g of fiber and 0.68 g of protein, along with a meaningful dose of vitamin C — roughly 14.8 mg per 100 g, which is about 16% of the daily value for most adults. They also provide small amounts of potassium, folate, and calcium.

• Use grams for accuracy. Kitchen scales are inexpensive and instantly eliminate portion-size guesswork. This is especially important if you're tracking calories carefully for weight management.
• Volume measurements vary. “One cup” of sliced radishes can vary by how thick you slice them. Thin slices pack more densely, so a cup might contain more grams than the 116 g average. When precision matters, weigh before slicing.
• Don't forget dips. Radishes are often eaten with ranch dressing, hummus, or butter. Those accompaniments add far more calories than the radish itself, so log them separately.
• Consider the leaves. Radish greens are also edible and nutritious, but their calorie count is different from the root. This calculator covers the root only.

Frequently Asked Questions

Are radishes really almost zero-calorie foods?

Radishes are very low in calories, but not quite zero. A medium radish contains roughly 1.4 kcal, so five of them come to about 7 kcal — still negligible in most daily budgets. Calling them “zero-calorie” is an acceptable shorthand for most practical purposes, but if you log precisely, the calculator's numbers give you the true total.

Should I weigh radishes raw or cooked?

Raw, because that's how the reference data is standardized. Cooking causes water loss, which concentrates calories by weight. A cooked radish has more calories per gram than a raw one for the same raw weight. If you measure cooked radishes, note that the calorie-per-gram figure will be slightly higher than 0.16.

Why does the per-gram calorie count matter?

Per-gram values let you compare foods without worrying about serving sizes. Radishes at 0.16 kcal/g are among the lowest-calorie vegetables available — far lower than starchy vegetables like potatoes (about 0.77 kcal/g) or corn (about 0.86 kcal/g). If you're building a high-volume, low-calorie meal, radishes are an excellent choice.

Can I use this calculator for pickled or roasted radishes?

Only as a rough starting point. Pickled radishes absorb some sugar from the brine, raising their calorie count, while roasted radishes lose water but may gain oil. For any prepared radish dish, check the recipe's other ingredients and estimate accordingly.

How do radishes compare to other crunchy vegetables?

Cucumber, celery, and lettuce are in the same ultra-low-calorie range. Radishes are slightly more calorie-dense than celery (about 0.14 kcal/g) but still very low. If you track multiple vegetables, you might also appreciate the generic vegetable calories per gram calculator for easy side-by-side estimates, or the onion calories per ounce calculator for another common salad ingredient.