Wasabi root has 109 kcal per 100 g. The real root is rare — most wasabi products are dyed horseradish. Used in tiny amounts (2–5 g), so calorie impact is negligible.
How should I track Wasabi, root?
Wasabi, root is high in fiber. For consistent tracking of Wasabi, root, weigh it raw. Cooking method changes both weight and calorie density — steaming barely changes anything, but roasting with oil or frying can double the calories. A systematic review (Whitton et al., Adv Nutr 2022) found vegetables are omitted from food logs 2–85% of the time, often because people assume they are "free" calorically. While most vegetables are indeed low-calorie, the fats added during cooking are not. Log the oil, butter, or dressing separately to keep your tracking accurate.