Mushrooms are often overlooked as a source of vitamin C, but several varieties contribute a modest amount to your daily intake. This calculator estimates how much vitamin C you get from the mushrooms you eat based on the variety, preparation method, and portion size.
Whether you follow a plant-forward diet, track micronutrients, or simply want to know how your favorite sautéed mushrooms fit into your nutrition goals, this tool provides a quick estimate in milligrams and as a percentage of the Daily Value. The built-in reference data covers white button, crimini, portobello, shiitake, oyster, enoki, maitake, chanterelle, morel, and dried shiitake mushrooms.
Just select the mushroom type, choose raw or cooked, enter your portion weight in grams, ounces, cups, or servings, and hit Calculate. You will see the result instantly along with a clear step-by-step breakdown of the vitamin C math.
🍄 Mushroom Vitamin C Calculator
Your Results
How to Use This Calculator
To estimate the vitamin C in your mushroom dish, start by choosing the closest mushroom variety from the dropdown. If you are using a mix, calculate each type separately and add the results. Next, indicate whether the mushrooms are raw or cooked: simmering, sautéing, and roasting all reduce vitamin C to some degree, and the calculator applies a roughly 40% loss factor for cooked fungi.
Then enter the portion size. You can type the weight in grams or ounces, or use common kitchen measures like a cup of sliced mushrooms or a standard serving. The calculator converts everything to grams before multiplying by the vitamin C density of the selected variety.
Tip: Weighing mushrooms on a kitchen scale is far more accurate than measuring by volume, especially if you chop them to different sizes. A cup of chopped mushrooms can vary by 15–20 g depending on how tightly you pack it.
Vitamin C Content at a Glance
The table below lists approximate raw vitamin C values per 100 g. These figures are compiled from USDA nutrient databases and can vary by growing conditions, storage time, and the specific cultivar.
| Mushroom variety | Vitamin C per 100 g (raw) |
|---|---|
| White button | 2.1 mg |
| Crimini / Baby bella | 2.0 mg |
| Portobello | 1.8 mg |
| Shiitake | 0.7 mg |
| Oyster | 0.2 mg |
| Enoki | 2.5 mg |
| Maitake | 0.2 mg |
| Chanterelle | 4.0 mg |
| Morel | 4.0 mg |
| Dried shiitake | 0.5 mg |
Compared to classics like oranges (53 mg/100 g) or bell peppers (128 mg/100 g), mushrooms are not a powerhouse. Still, they can contribute a few milligrams of vitamin C to a dish, especially if you eat a generous 200 g portion of raw mushrooms.
How the Calculation Works
The calculator uses the standard relationship between weight and nutrient density:
Vitamin C (mg) = (portion weight in grams ÷ 100) × vitamin C per 100 g × retention factor
For a raw mushroom, the retention factor is 1.0. For cooked or sautéed mushrooms, the calculator uses 0.6, accounting for the typical vitamin C lost during heating. If you add lemon juice or an acidic ingredient to a mushroom sauté, the actual retention may be slightly higher, since ascorbic acid is more stable in acidic environments.
Why Cooking Changes the Numbers
Vitamin C is a water-soluble antioxidant that is sensitive to heat, light, oxygen, and water. When mushrooms are boiled or simmered, some ascorbic acid leaches into the cooking liquid; sautéing exposes them to heat and oxygen, which accelerates oxidation. Steaming and microwaving tend to preserve more vitamin C because they use shorter cook times and less water.
Limitations: This calculator provides a dietary estimate, not a laboratory analysis. Actual vitamin C content depends on storage time, harvest date, and cooking method. Mushrooms stored for more than a week in the fridge may lose a measurable share of their vitamin C before you even cook them.
Worked Examples
Example 1: Raw white mushrooms
Portion: 150 g of raw white button mushrooms. Calculation: (150 ÷ 100) × 2.1 × 1.0 = 3.15 mg vitamin C, which is about 3.5% of the 90 mg Daily Value.
Example 2: Sautéed shiitake
Portion: 200 g fresh shiitake, sautéed. Calculation: (200 ÷ 100) × 0.7 × 0.6 = 0.84 mg vitamin C — a negligible contribution, less than 1% DV.
Example 3: Chanterelle soup
Portion: 250 g chanterelles simmered into a soup. Calculation: (250 ÷ 100) × 4.0 × 0.6 = 6.0 mg vitamin C. Even after cooking, chanterelles provide more vitamin C than most other mushroom varieties.
Try the Cantaloupe Vitamin C Calculator if you want to compare a genuinely high–vitamin C food with mushrooms.
Frequently Asked Questions
Why do mushrooms have so little vitamin C compared to fruit? Mushrooms are fungi, not plants; their nutritional profile is completely different. Their contribution lies in B vitamins, copper, selenium, and dietary fiber rather than ascorbic acid.
Do dried mushrooms still contain vitamin C? Drying removes most water and some heat-sensitive nutrients. Dried shiitake typically show less vitamin C than fresh shiitake, which is why the calculator lists a lower value for dried varieties.
Can I use this calculator for mixed mushroom recipes? Yes — compute each type by its weight and add the results together. For a stir-fry with 100 g oyster and 50 g enoki, you would run the tool twice and sum the final vitamin C amounts.
Where does the Daily Value come from? The U.S. Food and Drug Administration set the Daily Value for vitamin C at 90 mg for adults, based on an average 2,000-calorie diet. For more details, see the USDA FoodData Central database.
If you also track other mushroom micronutrients, the Mushroom Iron Calculator can help you estimate iron intake from the same portions.