Oil Iron Calculator

Cooking oils are not the first food you would check for iron, but when you track micronutrients, even trace amounts can add up. This oil iron calculator estimates the iron delivered by a typical serving of cooking oil — whether you are drizzling extra-virgin olive oil over a salad, sautéing with sesame oil, or measuring a cup for baking.

Choose an oil type and enter your serving size in tablespoons, teaspoons, milliliters, grams, or cups. The tool converts your serving to grams using the average density of edible oils (0.92 g/mL), applies the selected oil’s iron value, and returns the estimated milligrams of iron plus the percentage of your daily value.

Oils generally contain only trace amounts of iron, but values vary by oil type and refinement. This calculator helps with meal logging, diet planning, and comparing standard or fortified oil products.

Estimate the iron contributed by a serving of cooking oil.

Oil type

Serving amount

Show pregnancy DV reference (27 mg)

Step-by-Step Guide

Select the oil you are using from the dropdown menu. If your exact brand is not listed, choose the closest match or the generic vegetable oil blend option.
Enter the serving size in the amount field. You can type any decimal value, such as 1.5 or 0.75.
Pick the matching unit: tablespoons, teaspoons, milliliters, grams, or cups. The calculator handles the conversion automatically.
Optional: enable the “Show pregnancy DV reference” toggle if you track your intake against the 27 mg daily value used for pregnancy and lactation, instead of the standard adult value of 18 mg.
Press Calculate iron to see the estimated milligrams of iron and its percentage of the daily value. Use Copy result to save a one-line summary for your meal log, or Reset to clear the form.

How It Works

Iron values for each oil are expressed as milligrams of iron per 100 grams of oil, based on commonly reported figures from the USDA FoodData Central database. To estimate the iron in your serving, the calculator first converts the volume you entered into milliliters, then converts milliliters into grams using the average density of edible oils.

Most cooking oils have a density close to 0.92 g/mL at room temperature. That means one tablespoon (15 mL) weighs about 13.8 g, and one cup (240 mL) weighs about 220.8 g. Once the serving weight is known, the iron content is calculated with this formula:

Iron (mg) = serving weight (g) × oil iron value (mg per 100 g) ÷ 100

For example, a 1-tablespoon serving of extra-virgin olive oil contains roughly 0.077 mg of iron. The percentage of daily value is then computed against the 18 mg adult reference value, or the 27 mg pregnancy reference when the toggle is enabled. You can browse the underlying nutrient data directly at the USDA FoodData Central website.

Worked Examples

Example 1 — 2 tablespoons of sesame oil. Sesame oil has 0.24 mg iron per 100 g. Volume: 2 tbsp = 30 mL. Weight: 30 × 0.92 = 27.6 g. Iron: 27.6 × 0.24 ÷ 100 = 0.066 mg. That is about 0.37% of the adult daily value (18 mg).

Example 2 — 1 cup of extra-virgin olive oil. EVOO has 0.56 mg iron per 100 g. Weight: 240 × 0.92 = 220.8 g. Iron: 220.8 × 0.56 ÷ 100 = 1.236 mg. That is about 6.9% of the adult daily value — still modest, but meaningful if you use large amounts for baking or dressings.

Example 3 — 5 grams of coconut oil. Coconut oil has 0.05 mg per 100 g. Iron: 5 × 0.05 ÷ 100 = 0.0025 mg, essentially negligible.

These examples illustrate why the healthiest oils are not selected for their iron content. Even generous servings rarely contribute more than a small fraction of your daily iron needs.

Reference Table

The table below lists the approximate iron values used by this calculator. Values come from typical USDA nutrient profiles and can vary slightly by brand, crop year, and processing method.

Oil	Iron (mg / 100 g)
Extra-virgin olive oil	0.56
Olive oil	0.56
Sesame oil	0.24
Avocado oil	0.22
Flaxseed oil	0.20
Canola oil	0.06
Corn oil	0.05
Coconut oil	0.05
Soybean oil	0.05
Sunflower oil	0.03
Peanut oil	0.03

In general, unrefined and unfiltered oils — such as extra-virgin olive oil and toasted sesame oil — tend to carry slightly more trace minerals than highly refined neutral oils. However, the differences are tiny in absolute terms and should not influence your choice of cooking oil.

Tips & Common Mistakes

Use the exact volume from your recipe for accurate meal logging. Spoon measurements in recipes normally mean level tablespoons, not heaping ones. If you pour oil directly from the bottle, measure with a proper measuring spoon instead of estimating by eye.

Remember that oil density varies a little with temperature. Warm oil is slightly less dense, while refrigerated oil is a bit more dense. The 0.92 g/mL average is accurate enough for meal-tracking purposes.

Do not rely on cooking oils as a meaningful iron source. Their iron content is tiny; a typical serving provides well under 1% of the daily value. If you are concerned about iron deficiency, focus on beans, lentils, spinach, fortified cereals, and lean red meat, and talk to a healthcare professional before making dietary changes.

Frequently Asked Questions

Do all oils contain the same amount of iron? No. Iron values vary with the source plant, the climate where it was grown, and how the oil is processed. Refined oils generally contain less iron than unrefined or unfiltered oils.

Why does my nutrition label not list iron? Most oils contain so little iron that regulatory rules allow manufacturers to list it as 0% DV on the label. The underlying trace amount may still be detected in laboratory analyses, which is why nutrition databases sometimes report a small nonzero number.

Can I use this calculator for fortified or infused oils? Infused oils, such as garlic- or chili-infused oil, may contain small amounts of iron leached from the added ingredients. This calculator uses baseline values for plain oils, so results for fortified or infused products will be approximate.

Does cooking affect the iron content? Heating oil does not significantly change its mineral content, although frying iron-rich foods in oil can transfer tiny amounts of iron into the oil. In practice, the effect is negligible for nutrition tracking.

Oil Iron Calculator