Fresh mussels are a standout source of iron for anyone tracking micronutrients. A 100 g serving of cooked mussels delivers about 6.7 mg of iron — roughly 37% of the adult Daily Value — along with protein, zinc, and vitamin B12. Because mussels are often served by the piece, cup, or dish, estimating your actual intake can be a little confusing.
This mussel iron calculator takes the guesswork out of that math. Choose your mussel amount in grams, ounces, or 150 g servings, select whether the mussels are raw or cooked/steamed, and the tool calculates the iron content plus its percentage of the daily recommended value. It also shows a step-by-step breakdown so you can see exactly how the result was derived.
Use it for meal planning, diet logs, or simply to compare how raw versus cooked mussels differ per gram. It is especially useful for people working on iron adequacy, athletes, and anyone who eats seafood regularly and wants a precise, evidence-based nutrient estimate.
🦪 Mussel Iron Calculator
How This Mussel Iron Calculator Works
This calculator uses nutrient averages from the USDA FoodData Central database for blue mussels (Mytilus edulis). Raw blue mussel meat contains about 3.95 mg of iron per 100 g; cooked or steamed mussel meat contains about 6.72 mg per 100 g. The difference is mostly moisture: cooking drives off water, which makes the same edible meat more nutrient-dense per gram. The tool converts your portion into grams, multiplies it by the per-100 g iron value for the preparation you select, and then compares the result with the adult Daily Value of 18 mg. For a 150 g cooked serving, the calculator returns roughly 10.1 mg of iron — more than half of a typical adult's daily need from one seafood course.
Weight interpretation is important. The calculator assumes you are entering the weight of edible shelled meat, not the weight of whole shell-on mussels. Shells can make up most of the raw weight, so entering a shell-on portion would produce an unrealistically high iron estimate. If you are logging a mixed seafood dish, try to estimate the mussel meat portion separately from broth or sauce, since the calculator is only accounting for the mussels themselves.
Iron in Mussels: Quick Reference
Use this table for a fast check when planning a meal. Percent DV is based on 18 mg iron per day for adults.
| Form | Iron per 100 g | Iron per 85 g (3 oz) | Iron per 150 g serving | % DV per 150 g |
|---|---|---|---|---|
| Raw | 3.95 mg | 3.36 mg | 5.93 mg | 33% |
| Cooked / steamed | 6.72 mg | 5.71 mg | 10.08 mg | 56% |
Percent Daily Values use the adult FDA DV of 18 mg iron. Individual needs vary by age, sex, pregnancy, and medical conditions.
Worked Examples
Example 1: 4 oz cooked mussels. 4 oz converts to 113.4 g. Iron = (113.4 ÷ 100) × 6.72 = 7.62 mg, which is about 42% of the DV.
Example 2: 250 g raw mussels. Iron = (250 ÷ 100) × 3.95 = 9.88 mg, about 55% of the DV.
Example 3: 2 servings of cooked mussels. 2 × 150 g = 300 g. Iron = (300 ÷ 100) × 6.72 = 20.16 mg, which is 112% of the DV.
Tips & Best Practices
- Weigh mussels after removing the shells. If you only know the shell-on weight, a reasonable cooked meat yield is roughly 150–250 g from a 1 lb (454 g) bag, depending on shell thickness and mussel size. When in doubt, cook, shell, then weigh the meat.
- If your recipe is measured in pounds, convert it to grams first — this pounds-to-grams tool makes the conversion quick.
- For total daily iron tracking, add this result to your other meals. Athletes who monitor iron before and after training can also pair it with this sports iron calculator.
- Pair mussels with lemon juice, tomatoes, or peppers when possible. Vitamin C does not create iron, but it can improve absorption of any non-heme iron in the same meal, and it adds brightness to seafood dishes.
- If using canned mussels, remember that drained solids may differ by brand and packing liquid. Check the package nutrition label when calorie and micronutrient precision matters.
Factors Affecting Accuracy
Iron values in seafood vary by species, season, water temperature, and diet of the animal. Blue mussels are the most common data source and are what this calculator uses; other species such as Mediterranean or green-lipped mussels may have slightly different mineral concentrations. Even within one species, wild and farmed mussels can differ because their mineral content reflects the plankton and dissolved nutrients in the water where they grew. Cooking method also matters: steaming, boiling, grilling, and frying change water content, so per-gram iron can move up or down even though the total iron in the meat is essentially unchanged.
As a result, treat any one batch of mussels as an estimate. For clinical or medical decisions about iron supplementation, ask a doctor or registered dietitian; for general meal planning, the 3.95 mg and 6.72 mg reference values are reliable baselines. Official reference data can be checked at USDA FoodData Central. If you are tracking a brand-specific frozen or marinated mussel product, the package label will usually be more precise than a generic estimate.
Frequently Asked Questions
Does cooking destroy the iron in mussels? No. Minerals are stable during normal cooking. The total iron in the meat remains approximately the same, but water loss makes cooked mussels contain more iron per 100 g than raw mussels. That is why the same 100 g of cooked meat can deliver a noticeably higher iron number than 100 g of raw meat.
How much iron is in a typical 150 g serving of cooked mussels? About 10.08 mg, which supplies 56% of the adult Daily Value for iron. Depending on your individual needs, that one serving may cover a large part of your daily target.
Are mussels a better iron source than fish or chicken? Generally yes. White fish and chicken breast are much lower in iron per 100 g. Mussels also supply heme iron, a form your body absorbs more efficiently than the non-heme iron found in plants, so the effective iron contribution is often higher than the raw milligram value would suggest.
Should I use the raw or cooked option? Use the option that matches how the mussels are weighed. If you cooked mussels and weighed them after cooking, choose 'Cooked / steamed'. If you started with raw shelled meat, choose 'Raw'. Be consistent with the same option each time you log the same recipe so your daily totals stay comparable.