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

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.

  1. First, determine the observed relative standard deviation. 
  2. Next, determine the theoretical relative standard deviation. 
  3. Next, gather the formula from above = HorRat = RSDo / RSDt.
  4. Finally, calculate the Horwitz Ratio.
  5. 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