Elemental Iron Calculator
Elemental Iron Calculator
Calculation Results
| Calculation | Value |
|---|---|
| Elemental Iron per Unit (mg) | - |
| Elemental Iron per Dose (mg) | - |
| Total Daily Elemental Iron (mg/day) | - |
What is Elemental Iron?
Elemental iron is the actual amount of pure iron your body can absorb from an iron supplement. Many iron pills are made from iron salts like ferrous sulfate or ferrous gluconate, but those salts contain other parts besides just iron.
What is the difference between iron salt and elemental iron?
When you take an iron supplement, it usually comes as an iron salt, like ferrous sulfate or ferrous gluconate. This salt is just the whole chemical form that carries the iron. But your body only uses the iron part inside that salt, which is called elemental iron. So, when you read the label, the big number is the salt amount, but the smaller number shows how much real iron your body actually gets.
Why elemental iron is what really matters for dosing?
When you take an iron supplement, what your body actually needs is the elemental iron inside it, and not the whole salt or pill weight. Different iron pills have different amounts of true iron in them. So, a 325 mg ferrous sulfate tablet doesn’t mean you’re getting 325 mg of iron. You are actually only getting about 65 mg of usable iron. That’s why we always check the elemental iron for proper dosing.
Different Types of Iron Supplements
Iron supplements come in different forms, and each one has a different amount of actual iron your body uses, which is called elemental iron. The most common is ferrous sulfate, which is the type most people get from the pharmacy. Regular ferrous sulfate tablets are about 20% elemental iron, so if you take a 325 mg tablet, you get about 65 mg of real iron. There’s also ferrous sulfate dried, which has less water and is stronger. It is about 30% elemental iron, so a smaller tablet can give you a similar dose. Ferrous gluconate is a gentler option for some people’s stomachs but has less iron, around 12% elemental iron, so a 325 mg tablet only gives you about 38 mg of real iron. Then there’s ferrous fumarate, which is stronger, giving about 33% elemental iron. Sso a 324 mg tablet gives around 106 mg of iron.
| Iron Supplement | % Elemental Iron |
| Ferrous sulfate | ~20% |
| Ferrous sulfate dried | ~30% |
| Ferrous gluconate | ~12% |
| Ferrous fumarate | ~33% |