Miso soup is one of the lowest-calorie soups you can eat. A standard restaurant-style bowl comes in at roughly 50 to 60 calories, and an instant packet runs about 30 calories. For comparison, a similar serving of chicken noodle soup typically has 80 to 100 calories, and cream-based soups can easily reach 200 or more.
Calories by Type and Serving Size
The calorie count in miso soup depends on what goes into it, and the range is narrower than you might expect. A basic bowl made with miso paste, water, tofu, and seaweed lands around 54 calories for a 9.2-ounce serving. That serving also contains about 5.8 grams of protein, under 3 grams of fat, and roughly 3 grams of carbohydrates. It’s a genuinely light dish, not just a “lighter option.”
Instant miso soup packets are even lower. A single packet from a brand like Miko contains about 30 calories in a 20-gram dry portion that you reconstitute with hot water. These packets tend to have less tofu and fewer add-ins, which explains the difference.
Homemade miso soup sits somewhere in between, depending on your ingredients. A simple version with tofu, wakame seaweed, and green onion will stay in the 40 to 70 calorie range per bowl. Start adding vegetables like mushrooms, daikon, or sweet potato, and you might push it to 80 or 90 calories, which is still very low for a filling bowl of soup.
What Makes It So Low in Calories
The base of miso soup is mostly hot water. The miso paste itself, which is made from fermented soybeans, rice, and salt, is calorie-dense by weight, but you only use about a tablespoon per serving. That small amount dissolves into a full bowl of broth, giving you a lot of flavor without much caloric load. The tofu adds protein without many calories, and seaweed is essentially negligible.
This is also why miso soup can feel more satisfying than its calorie count suggests. The combination of warm liquid, protein from tofu and soy, and the savory depth of fermented miso (that rich, umami flavor) activates a sense of fullness that a 50-calorie snack normally wouldn’t deliver.
The Sodium Trade-Off
The main nutritional caveat with miso soup is sodium. One serving of traditional miso soup contains 1 to 2 grams of salt, which translates to roughly 400 to 800 milligrams of sodium per bowl. The general daily recommendation is under 2,300 milligrams. So a single bowl won’t put most people over the edge, but two or three servings a day, which is common in traditional Japanese diets, adds up quickly.
If you’re watching sodium intake, you can use less miso paste per bowl. The soup will be milder in flavor but still works as a light starter. Some reduced-sodium miso pastes are also available at most grocery stores.
Nutritional Benefits Beyond Calories
Miso soup isn’t just “not bad for you.” It delivers a respectable nutritional profile for something so light. A standard bowl provides nearly 6 grams of protein, a small amount of dietary fiber (about 1.4 grams), and minerals like calcium and iron from the fermented soybean paste. Miso paste also contains B vitamins and vitamin E in small amounts.
The fermentation process is worth noting, too. Miso is a fermented food, meaning it contains live cultures similar to those in yogurt or kimchi. These cultures support gut health, and fermentation also makes the nutrients in soybeans easier for your body to absorb.
How Ingredients Change the Count
A plain miso broth with tofu and seaweed is the baseline. Here’s how common additions shift the calorie count per bowl:
- Noodles (udon or soba): Adding even a small portion of noodles can bring a bowl to 150 to 250 calories, fundamentally changing the dish from a light starter to a meal.
- Pork or seafood: Sliced pork belly, shrimp, or clams push the soup to 100 to 200 calories depending on portion size.
- Root vegetables: Daikon, sweet potato, or taro add 20 to 40 calories and make the soup heartier.
- Leafy greens and mushrooms: Spinach, bok choy, enoki, or shiitake mushrooms add virtually no calories, typically under 10 extra per bowl.
If your goal is to keep miso soup in the “very low calorie” category, stick with tofu, seaweed, leafy greens, and mushrooms. These give you texture and substance without meaningfully increasing the calorie count.
Miso Soup as a Weight Management Tool
Starting a meal with a low-calorie, broth-based soup is a well-studied strategy for eating less overall. The warm liquid takes up stomach volume and slows the pace of eating, which gives your body more time to register fullness before you move on to higher-calorie dishes. Miso soup fits this role well because it’s flavorful enough to feel like a real course, not just a glass of warm water.
At 30 to 60 calories per serving, miso soup is also a practical snack replacement. An afternoon bowl delivers warmth, protein, and satisfaction for a fraction of the calories in most packaged snacks. Instant packets make this especially easy since they require nothing more than a mug and hot water.