Enter the observed relative standard deviation and the theoretical relative standard deviation into the Calculator. The calculator will evaluate the Horwitz Ratio.

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## Horwitz Ratio Formula

HorRat = RSDo / RSDt

Variables:

- HorRat is the Horwitz Ratio ()
- RSDo is the observed relative standard deviation
- RSDt is the theoretical relative standard deviation

To calculate Horwitz Ratio, divide the observed relative standard deviation by the theoretical relative standard deviation.

## How to Calculate Horwitz Ratio?

The following steps outline how to calculate the Horwitz Ratio.

- First, determine the observed relative standard deviation.
- Next, determine the theoretical relative standard deviation.
- Next, gather the formula from above = HorRat = RSDo / RSDt.
- Finally, calculate the Horwitz Ratio.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

observed relative standard deviation = 5

theoretical relative standard deviation = 6