Milligrams to international units
Type a value in mg to get it in IU instantly.
That's 4,000× as much as a high-dose supplement — nothing on our list beats it. Information only: check the form stated on your own label.
Convert the other way: IU to mg
What it means
How much is that?
Information only, not medical advice. Labels increasingly give micrograms instead of IU, and for vitamin E the natural and synthetic forms differ.
The math
How to convert mg to IU
An IU is a unit of activity, so each vitamin has its own weight: µg = IU × µg per IU. The figures below use the vitamin selected above.
Example: 1,000 mg = 40,000,000 IU.
The table below is for Vitamin D (1 IU = 0.025 µg).
Every unit
Your dose in every unit
Tables
mg to IU conversion table
| mg | IU |
|---|---|
| 100 mg | 4,000,000 IU |
| 200 mg | 8,000,000 IU |
| 400 mg | 16,000,000 IU |
| 500 mg | 20,000,000 IU |
| 800 mg | 32,000,000 IU |
| 1,000 mg | 40,000,000 IU |
| 2,000 mg | 80,000,000 IU |
| 4,000 mg | 160,000,000 IU |
| 5,000 mg | 200,000,000 IU |
| 10,000 mg | 400,000,000 IU |
IU to mg conversion table
| IU | mg |
|---|---|
| 100 IU | 0.0025 mg |
| 200 IU | 0.005 mg |
| 400 IU | 0.01 mg |
| 500 IU | 0.0125 mg |
| 800 IU | 0.02 mg |
| 1,000 IU | 0.025 mg |
| 2,000 IU | 0.05 mg |
| 4,000 IU | 0.1 mg |
| 5,000 IU | 0.125 mg |
| 10,000 IU | 0.25 mg |
Quick answers
Quick answers
- How many IU is 1 mg?
- 1 mg is 40,000 IU.
- How many IU is 10 mg?
- 10 mg is 400,000 IU.
- How many IU is 1,000 mg?
- 1,000 mg is 40,000,000 IU.
The units
About these units
Milligrams (mg)
For vitamins present in larger amounts, such as E and C.
International units (IU)
A measure of biological activity. Its weight depends on the vitamin.
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