Parsnips are a cool-season root vegetable with a sweet, earthy flavor, and they contribute a modest but useful amount of iron to a balanced diet. A 100-gram serving of raw parsnip provides about 0.59 mg of iron, which supports oxygen transport and energy metabolism. Because portion sizes vary widely — from a few roasted wedges to a full cup of mash — it helps to calculate exactly how much iron you are actually getting.
This parsnip iron calculator converts your portion into grams, adjusts for raw versus boiled preparation, and returns the estimated iron content in milligrams plus its percentage of the Daily Value (18 mg for adults). You can work in grams, ounces, cups, or whole parsnips, and use the preset buttons for common serving sizes. It is a handy tool for meal planning, micronutrient tracking, and anyone curious about the nutritional profile of this underrated root vegetable.
🥕 Parsnip Iron Calculator
Estimates the iron content of your parsnip portion using USDA reference values for raw and boiled parsnips.
How to Use This Tool
Choose a portion size that matches how you think about parsnips. The calculator accepts grams, ounces, cups of chopped or sliced pieces, and whole medium parsnips. If you are measuring leftovers or a recipe, weighing the parsnip on a kitchen scale and choosing grams gives the most accurate estimate. Cups are convenient for soups and roasts, but their weight can vary with how finely the pieces are cut and how firmly they are packed, so treat cup-based results as a close approximation.
Next, select the preparation method. Raw parsnips contain about 0.59 mg of iron per 100 g, while parsnips that have been boiled and drained contain about 0.44 mg per 100 g. The lower value after boiling is expected: some minerals leach into the cooking water. If you use the cooking liquid in the same meal, you recapture part of that lost iron.
Calculation Method
The estimate is based on standard nutrition reference data for parsnips. The calculation follows a simple two-step process:
iron (mg) = grams × (mg per 100 g ÷ 100).We use 0.59 mg per 100 g for raw parsnips and 0.44 mg per 100 g for boiled, drained parsnips, consistent with values reported in the USDA FoodData Central database. Portion conversions are 28.35 g per ounce, about 133 g per cup of raw chopped parsnip, 156 g per cup of cooked sliced parsnip, and roughly 170 g for one medium parsnip (about 9 inches long). When measuring whole parsnips, actual weights can range from 100 g for small roots to 250 g or more for thick ones, so the medium-parsnip option is an average.
The Daily Value percentage is calculated against the 18 mg reference amount used for iron on U.S. Nutrition Facts labels. For example, 100 g of raw parsnip provides 0.59 mg, which is about 3.3% of the Daily Value.
Worked Examples
Example 1 — Raw parsnip, 100 g. 100 g × (0.59 ÷ 100) = 0.59 mg iron. This is 0.59 / 18 × 100 = 3.3% DV.
Example 2 — One cup of raw chopped parsnip. 1 cup ≈ 133 g. 133 × (0.59 ÷ 100) = 0.78 mg iron, about 4.4% DV.
Example 3 — One medium raw parsnip. 170 g × (0.59 ÷ 100) = 1.00 mg iron, about 5.6% DV.
Example 4 — Boiled parsnip, 1 cup slices. 156 g × (0.44 ÷ 100) = 0.69 mg iron, about 3.8% DV.
These examples show why both portion size and preparation matter: the same one-cup serving changes from about 0.78 mg raw to 0.69 mg boiled, and a large parsnip can easily deliver twice the iron of a small one.
Reference Data
| Serving | Approx. weight | Iron, raw | Iron, boiled |
|---|---|---|---|
| 100 g (3.5 oz) | 100 g | 0.59 mg | 0.44 mg |
| ½ cup chopped | from 66 g raw / 78 g cooked | 0.39 mg | 0.34 mg |
| 1 cup chopped/sliced | from 133 g raw / 156 g cooked | 0.78 mg | 0.69 mg |
| 1 medium parsnip | ~170 g | 1.00 mg | 0.75 mg |
Table values are rounded to two decimal places. Use the calculator for exact portion-adjusted results.
Factors That Affect Accuracy
No two parsnips are identical. Iron content varies with cultivar, soil mineral levels, growing season, and maturity. Root vegetables also store minerals differently depending on the part of the root you eat — the outer layers and skin can differ from the core. If you peel parsnips, you may remove a small amount of mineral content, although the difference is usually minor because iron is distributed throughout the flesh.
Cooking method is the most important variable after portion size. Boiling in a large volume of water allows water-soluble minerals to escape, which is why drained boiled parsnips show lower iron per 100 g than raw ones. Steaming or roasting in the skin tends to preserve more minerals because less leaching occurs. If you boil parsnips for soup, the iron that moves into the broth is not lost if you consume the broth.
Frequently Asked Questions
Are parsnips a good source of iron? Parsnips are a modest source. A 100 g serving of raw parsnip supplies about 3% of the Daily Value, so they contribute to your iron intake but should not be relied on as a primary iron source. Legumes, leafy greens, fortified cereals, and red meat are much richer options.
Why do boiled parsnips show less iron? Iron is water-soluble enough to leach into cooking water during boiling. If you drain and discard the water, you lose some minerals. The difference between raw and boiled parsnips in this calculator reflects that loss.
Can I use this calculator for roasted parsnips? Yes, but treat the result as an approximation. Roasting does not cause the same mineral loss as boiling, so the raw value is probably closer to roasted than the boiled value is. We kept roasted parsnips under the raw estimate in this tool to avoid overstating precision.
How does parsnip iron compare with other root vegetables? Parsnips are similar to potatoes, carrots, and turnips — all in the rough range of 0.3–0.8 mg per 100 g raw. If you want to track iron across a whole meal, try the pea iron calculator for another plant-based iron source, or check the parsnip sugar calculator if you are also watching carbohydrate and sugar intake.
Additional Resources
For complete nutrient profiles, including vitamin C, potassium, and fiber, search for Parsnips raw or Parsnips cooked boiled drained in the USDA FoodData Central database. For general guidance on iron needs and absorption, see the NIH Iron Fact Sheet for Health Professionals. If you are planning meals around multiple nutrients, remember that the total diet matters more than any single vegetable.