International units to milligrams
Type a value in IU to get it in mg instantly.
That's 1.67× as much as a daily requirement, while a typical supplement is 2× more. Information only: check the form stated on your own label.
Convert the other way: mg to IU
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 IU to mg
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 IU = 0.025 mg.
The table below is for Vitamin D (1 IU = 0.025 µg).
Every unit
Your dose in every unit
Tables
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 |
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 |
Quick answers
Quick answers
- How many mg is 1 IU?
- 1 IU is 2.5×10⁻⁵ mg.
- How many mg is 10 IU?
- 10 IU is 0.00025 mg.
- How many mg is 1,000 IU?
- 1,000 IU is 0.025 mg.
The units
About these units
International units (IU)
A measure of biological activity. Its weight depends on the vitamin.
Milligrams (mg)
For vitamins present in larger amounts, such as E and C.
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