How do you convert percent to IU?

To convert a percentage to International Units (IU), you first need to know the specific conversion factor for the substance you are working with. Once you have that information, you can multiply the percentage by the conversion factor to get the IU value. For example, if you have a substance with a conversion factor of 0.01 IU/%, and you have a 5% concentration, you would multiply 5% by 0.01 to get 0.05 IU.