Convert IU/mL to U/mL or U/mL to IU/mL using a substance-specific IU per U factor for enzyme activity and assay concentration results.
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IU/mL to U/mL Conversion Formula
The following formula is used to convert IU/mL to U/mL:
Variables:
- U/mL is the value in Units per milliliter
- IU/mL is the value in International Units per milliliter
- IU per U is the number of International Units equivalent to one defined U for the same substance and assay
To convert IU/mL to U/mL, divide by the verified IU per U factor. To convert in the other direction, multiply by that factor. The example tables use hypothetical factors, not universal conversion constants.
| IU/mL to U/mL | U/mL to IU/mL |
|---|---|
| 0.1 IU/mL = 0.1 U/mL | 0.05 U/mL = 0.05 IU/mL |
| 0.25 IU/mL = 0.25 U/mL | 0.2 U/mL = 0.2 IU/mL |
| 0.5 IU/mL = 0.5 U/mL | 0.4 U/mL = 0.4 IU/mL |
| 1 IU/mL = 1 U/mL | 0.75 U/mL = 0.75 IU/mL |
| 2 IU/mL = 2 U/mL | 1.5 U/mL = 1.5 IU/mL |
| 5 IU/mL = 5 U/mL | 3 U/mL = 3 IU/mL |
| 10 IU/mL = 10 U/mL | 7.5 U/mL = 7.5 IU/mL |
| 20 IU/mL = 20 U/mL | 12.5 U/mL = 12.5 IU/mL |
| 25 IU/mL = 25 U/mL | 15 U/mL = 15 IU/mL |
| 40 IU/mL = 40 U/mL | 30 U/mL = 30 IU/mL |
| 50 IU/mL = 50 U/mL | 60 U/mL = 60 IU/mL |
| 75 IU/mL = 75 U/mL | 80 U/mL = 80 IU/mL |
| 100 IU/mL = 100 U/mL | 120 U/mL = 120 IU/mL |
| 150 IU/mL = 150 U/mL | 160 U/mL = 160 IU/mL |
| 200 IU/mL = 200 U/mL | 300 U/mL = 300 IU/mL |
| 250 IU/mL = 250 U/mL | 600 U/mL = 600 IU/mL |
| 500 IU/mL = 500 U/mL | 800 U/mL = 800 IU/mL |
| 1000 IU/mL = 1000 U/mL | 1500 U/mL = 1500 IU/mL |
| 2500 IU/mL = 2500 U/mL | 3000 U/mL = 3000 IU/mL |
| 5000 IU/mL = 5000 U/mL | 10000 U/mL = 10000 IU/mL |
| Formulas: IU/mL = (U/mL) × (IU per U) and U/mL = (IU/mL) ÷ (IU per U). This table assumes IU per U = 1. | |
| IU/mL to U/mL | U/mL to IU/mL |
|---|---|
| 10 IU/mL = 1 U/mL | 0.5 U/mL = 5 IU/mL |
| 25 IU/mL = 2.5 U/mL | 2 U/mL = 20 IU/mL |
| 50 IU/mL = 5 U/mL | 7.5 U/mL = 75 IU/mL |
| 100 IU/mL = 10 U/mL | 25 U/mL = 250 IU/mL |
| 1000 IU/mL = 100 U/mL | 250 U/mL = 2500 IU/mL |
| Formulas: IU/mL = (U/mL) × (IU per U) and U/mL = (IU/mL) ÷ (IU per U). This table assumes IU per U = 10. | |
What is IU/mL?
IU/mL stands for International Units per milliliter and is a measure used to quantify vitamins, hormones, some medications, vaccines, blood products, and similar biologically active substances. IU is tied to a biological reference standard. The meaning of U depends on the substance and assay; conversion requires documented equivalence for the same analyte and method. This converter does not determine medication doses.
How to Convert IU/mL to U/mL?
The following steps outline how to convert IU/mL to U/mL:
- First, determine the value in IU/mL that you want to convert.
- Next, obtain the verified IU per U factor for the specific substance and assay.
- Use the formula U/mL = IU/mL / (IU per U) to calculate the value in U/mL.
- Enter the values into the calculator above to verify your result.
Example Problem:
Use the following variables as an example problem to test your knowledge.
Value in IU/mL = 50 IU/mL
Hypothetical conversion factor = 40 IU per U (equivalent to 0.025 U per IU)
Using the formula, the value in U/mL would be 50 IU/mL / 40 IU per U = 1.25 U/mL.
