IU to mg converter

Convert IU (International Units) to mg (milligrams) for vitamins and supplements with accurate conversion factors.

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About This Tool

This tool converts between International Units (IU) and milligrams (mg) for various vitamins and supplements. IU is a measurement of biological activity used for fat-soluble vitamins (A, D, E) and some hormones, while mg measures mass. The conversion depends on the specific substance, as different compounds have different biological activities per milligram. Simply enter your value, select the substance, choose the conversion direction, and get instant, accurate results with detailed explanations.

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How to Use

Enter the numerical value you want to convert in the 'Value' field.
Select the substance from the dropdown menu (Vitamin A, D, E, etc.).
Choose the conversion direction: IU to mg or mg to IU.
Click the 'Convert' button to see the result.
View the detailed conversion result including the formula used.

Frequently Asked Questions

Find Quick Answers

What is the difference between IU and mg?

IU (International Unit) measures biological activity or potency, while mg (milligram) measures mass. Different substances have different conversion factors because their biological activity per milligram varies.

Why do conversion factors vary between substances?

Conversion factors depend on the specific compound's biological activity. For example, Vitamin A has different forms (retinol, beta-carotene) with different potencies, so the IU to mg ratio differs.

Are the conversion factors accurate for all brands?

The conversion factors are based on standard scientific values. However, some supplements may use different forms or concentrations, so always check the product label for specific information.

Can I convert mg to IU as well?

Yes, the tool supports bidirectional conversion. Simply select 'mg to IU' in the conversion direction option.

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