Fresh mushrooms are naturally very low in sodium, but the way they are packed, cooked, and seasoned can change that in a hurry. A raw white mushroom contains only a few milligrams of sodium, while a serving of canned mushrooms can contain several hundred milligrams because they are preserved in salted brine. If you are following a low-sodium diet, managing blood pressure, or simply tracking sodium for better nutrition awareness, knowing the difference matters.
The Mushroom Sodium Calculator estimates the sodium in fresh, canned, cooked, and dried mushrooms based on the amount you plan to eat. It also lets you add any table salt used in cooking or at the table, then shows your result in milligrams, per 100 grams, and as a percentage of the Daily Value. Just choose your mushroom type, select the prep method, enter the quantity, and hit Calculate.
🍄 1 · Mushroom type & form
⚖️ 2 · Amount
🧂 3 · Added salt (optional)
📊 Sodium results
Estimates are based on typical USDA values and may vary by brand and preparation.
Step-by-Step Guide
Using the calculator takes about thirty seconds. Start by choosing the mushroom variety — white button, cremini, portobello, shiitake, oyster, enoki, morel, or chanterelle — and then the preparation form: fresh raw, canned and drained, cooked without added salt, or dried. Next, enter how much you plan to eat. If you have a kitchen scale, weigh the mushrooms and enter grams or ounces for the most accurate result. If you do not have a scale, the cups-sliced and whole-mushroom options use typical serving weights for each variety, so you can still get a useful estimate.
If you seasoned the mushrooms with table salt — whether while cooking or at the table — check the added-salt box and enter the amount in pinches, teaspoons, or grams. One level teaspoon of table salt contains about 2,300 mg of sodium, so this step can completely change your total. Finally, press Calculate. The result area shows the total sodium in milligrams, the sodium per 100 grams, the percentage of the Daily Value, and a line-by-line breakdown of where the sodium came from, including a category label such as low or high sodium.
Reference Table: Typical Sodium Values
The figures below are based on USDA FoodData Central values for common mushroom forms. Values are per 100 grams, which is roughly 1½ cups of sliced fresh mushrooms or about ⅔ cup of canned mushrooms.
| Form | Per 100 g | Typical serving | Sodium per serving |
|---|---|---|---|
| Raw white / button mushrooms | 5 mg | 1 cup sliced (70 g) | 4 mg |
| Canned mushrooms, drained | 330 mg | ½ cup (80 g) | 264 mg |
| Cooked mushrooms, no salt added | 2–4 mg | ½ cup cooked (80 g) | 2–3 mg |
| Dried shiitake mushrooms | 13 mg | 4 mushrooms (15 g) | 2 mg |
| Fresh morels | 21 mg | 1 cup sliced (70 g) | 15 mg |
| Table salt | — | 1 teaspoon (6 g) | 2,300 mg |
How the Calculation Works
The calculator starts with a base sodium value for each mushroom variety in its fresh raw form, expressed in milligrams per 100 grams. It then applies a conversion factor for the preparation form: raw mushrooms keep their base value, cooked mushrooms are multiplied by a factor of 0.5 because cooking without salt dilutes no sodium but concentrates water loss changes the per-gram value slightly, and dried mushrooms use a dry-weight factor of about 5× compared with fresh weight. For canned mushrooms, the calculator uses a flat value of 330 mg per 100 g, which represents the average for commercially canned mushrooms packed in salted brine.
Your entered amount is first converted to grams using either your direct weight entry or the typical weights per cup and per whole mushroom. The total sodium from mushrooms is then grams × sodium per 100 g ÷ 100. If you added table salt, that sodium is added on top: one pinch of fine table salt adds roughly 160 mg, one teaspoon adds about 2,400 mg, and one gram of salt adds about 400 mg. The Daily Value percentage is calculated against the FDA reference value of 2,300 mg per day for adults.
Worked Examples
Example 1 — Fresh mushrooms, no salt. You eat 1 cup of sliced raw white mushrooms (70 g). Raw white mushrooms have about 5 mg sodium per 100 g, so 70 g contains 70 × 5 ÷ 100 = 3.5 mg, which rounds to 4 mg — a negligible 0.2% of the Daily Value.
Example 2 — Canned mushrooms. You add ½ cup of drained canned mushrooms (80 g) to a pasta sauce. Canned mushrooms average 330 mg per 100 g, so the serving contains 80 × 330 ÷ 100 = 264 mg — about 11% of the Daily Value before you add anything else.
Example 3 — With added salt. You sauté 200 g of fresh cremini mushrooms and season them with ¼ teaspoon of table salt. The mushrooms themselves contribute 200 × 8 ÷ 100 = 16 mg, while the salt contributes 0.25 × 2,400 = 600 mg. The total is about 616 mg, roughly 27% of the Daily Value — the salt, not the mushrooms, is doing the heavy lifting.
Factors Affecting Accuracy
Sodium content in real food varies. Canned mushrooms are the biggest variable: some brands pack them in regular brine, some in “no salt added” water, and the amount of brine clinging to the mushrooms after draining changes the number. Dried mushrooms also vary by brand and by whether any salt was added during processing, although most dried mushrooms are simply dehydrated without added salt.
The conversion weights for cups and whole mushrooms are typical averages. A cup of mushrooms sliced thick will weigh a little more than a cup sliced thin, and whole-mushroom weights assume medium-sized specimens. For anything where exact sodium matters — for example, on a strict medical low-sodium diet — weigh the mushrooms on a kitchen scale and check the nutrition label on any packaged product.
- Rinse canned mushrooms thoroughly before using — it is the single easiest way to cut sodium.
- Choose “no salt added” canned mushrooms when available; they contain only trace sodium.
- Season with herbs, garlic, lemon, vinegar, or salt-free spice blends.
- Remember that soy sauce, Worcestershire sauce, and broth added to mushrooms add sodium this calculator does not include.
Frequently Asked Questions
Are mushrooms actually low in sodium? Yes. Fresh mushrooms contain only 3–21 mg of sodium per 100 g, which qualifies as “very low sodium” under FDA labeling rules. The sodium almost always comes from processing or seasoning.
What is the FDA sodium Daily Value? The reference amount used for nutrition labels is 2,300 mg per day. You can read the official guidance at the FDA Daily Value page.
How much sodium is in a teaspoon of salt? About 2,300 mg, and a pinch (roughly 1/16 teaspoon) adds about 160 mg. Detailed nutrient values for salt and hundreds of mushroom products are available on USDA FoodData Central.