IU to mg Converter

Convert International Units (UI) to milligrams (mg) for vitamins, medications, and supplements with this accurate online tool.

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About This Tool

This UI to mg converter helps healthcare professionals, patients, and supplement users convert between International Units (UI) and milligrams (mg). International Units are used for vitamins like A, D, and E, where biological activity varies. Our tool provides accurate conversions based on established conversion factors for common substances, along with educational information about each conversion.

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How to Use

Enter the value you want to convert in the 'Value to Convert' field
Select the substance type from the dropdown menu (Vitamin A, Vitamin D, Vitamin E, Insulin, etc.)
Choose the conversion direction (UI to mg or mg to UI)
Click the 'Convert' button to see the result
View detailed conversion information including conversion factor and substance details

Frequently Asked Questions

Find Quick Answers

What is the difference between UI and mg?

International Units (UI) measure biological activity of substances like vitamins, while milligrams (mg) measure mass. The conversion factor varies by substance because biological activity per mass differs.

Are the conversion factors accurate for all brands?

Conversion factors are based on standard international references. However, some products may have slightly different formulations, so always consult product-specific information for critical medical decisions.

Can I convert mg to UI as well?

Yes, our tool supports bidirectional conversion. Simply select 'mg to UI' in the conversion direction dropdown.

Which substances are supported?

We support common substances including Vitamin A (retinol), Vitamin D (cholecalciferol), Vitamin E (alpha-tocopherol), Insulin, Heparin, and several others with established conversion factors.

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