Beef steak is one of the richest dietary sources of heme iron — the form your body absorbs most easily. The exact iron content of a steak, though, varies by cut, by its weight, and by whether that weight is measured raw or after cooking. This Steak Iron Calculator converts your steak into an estimated iron dose in milligrams using typical USDA nutrient values for popular cuts such as ribeye, sirloin, filet mignon, flank, skirt, and hanger steak.
Choose a cut, enter the weight, and select grams or ounces. If you enter a raw weight, the calculator applies a doneness yield factor to approximate the cooked portion before it calculates iron. You can also compare your result with the recommended daily intake for an adult male, adult female, pregnant woman, or the FDA Daily Value.
The calculator is aimed at meal planners, athletes, and anyone tracking micronutrients. Because nutrient databases reflect averages, treat the result as a close estimate, not a laboratory measurement.
Steak Iron Calculator
Estimate the iron in your steak by cut, weight, and doneness.
Step-by-Step Guide
- Select the cut that matches your steak in the first dropdown. If your exact cut is not listed, choose the closest one from the reference table below.
- Enter the steak weight in grams or ounces. Use a kitchen scale for the most reliable number.
- Tell the calculator whether that weight is raw or cooked. If you choose raw, pick a doneness level so the calculator can estimate the cooked yield.
- Pick a comparison target. The adult male target is 8 mg per day, adult female 18 mg, pregnant 27 mg, and the FDA Daily Value is 18 mg.
- Press Calculate iron. Review the breakdown to see the cooked portion, iron density, and percent of target.
Calculation Method
This calculator estimates iron with a simple two-step process. First it converts the weight to grams, then to cooked grams if needed. Second it multiplies cooked grams by the cut's iron density per 100 g.
For raw weights: cooked weight = raw weight × yield factor. Typical yield factors are rare 0.90, medium rare 0.85, medium 0.80, medium well 0.75, and well done 0.70.
Why apply a yield factor? A raw steak is mostly muscle, water, and fat. During cooking, moisture and fat are lost, so a 250 g raw steak might weigh about 213 g when cooked medium rare. Because the iron values in nutrient databases are reported for cooked meat, the yield step keeps the estimate consistent.
Worked Examples
Example 1: 8 oz ribeye, medium rare, raw. 8 oz = 226.8 g. Cooked yield at 0.85 = 192.8 g. Ribeye density 2.1 mg/100 g gives 192.8 × 2.1 ÷ 100 = 4.05 mg. That is about 22% of the FDA Daily Value.
Example 2: 170 g sirloin, cooked. 170 g × 2.5 mg/100 g = 4.25 mg. That covers about 53% of an adult male's 8 mg target.
Example 3: 6 oz hanger steak, medium, raw. 6 oz = 170.1 g. Medium yield 0.80 gives 136.1 g cooked. Hanger density 3.6 mg/100 g gives 136.1 × 3.6 ÷ 100 = 4.90 mg.
Reference Table: Approximate Iron in Cooked Cuts
| Cut | Iron (mg per 100 g) | Character |
|---|---|---|
| Hanger | 3.6 | Rich, beefy, loose grain |
| Skirt | 3.2 | Long flat muscle, intense flavor |
| Flank | 2.8 | Lean, bold flavor |
| Sirloin | 2.5 | Lean steakhouse favorite |
| T-Bone / Porterhouse | 2.4 | Includes strip and tenderloin |
| New York Strip | 2.2 | Modest marbling, firm bite |
| Ribeye | 2.1 | Heavy marbling, very tender |
| Filet Mignon | 2.0 | Lean tenderloin, mild taste |
These are practical averages for cooked, trimmed beef. USDA values vary with cooking method, trimming, and source animal.
Tips for a Better Estimate
- Weigh the steak before cooking if you plan to track nutrients per serving, then re-weigh after cooking to record the actual cooked yield.
- Use the same units throughout. If the package label is in pounds, convert to ounces first: 1 lb = 16 oz.
- Remember that iron density does not change much across lean and fatty cuts, but a fattier cut may weigh less after cooking because more fat renders out.
- Check the nutrition panel if you buy pre-marinated steaks; marinades add sodium and sometimes trace iron.
Frequently Asked Questions
Is raw or cooked weight better?
Cooked weight is more direct because the nutrient values are based on cooked meat. If the raw weight is more convenient, choose a doneness level to make the calculator estimate the cooked equivalent.
Why does the result differ from the label on my package?
Labels may use a different cut, different serving size, or values from a different database. Cooking method also matters: a steak cooked rare retains more moisture and can have a slightly different nutrient concentration per 100 g than one cooked well done.
Can steak alone meet my daily iron need?
Most people get iron from a mix of meat, poultry, fish, legumes, fortified cereals, and vegetables. A single 8 oz steak can provide roughly 25–60% of an adult man's daily target depending on cut and doneness, but a balanced diet is a more practical approach than relying on steak alone.
Additional Resources
- USDA FoodData Central — search for raw and cooked beef cuts to compare nutrient profiles.
- NIH Office of Dietary Supplements: Iron Fact Sheet for Health Professionals — explains absorption, deficiency, and recommended intakes.
- FDA Daily Value for Iron — how DV percentages on labels are calculated.