Enter the retention time for analyte and the retention time for reference into the RRT Calculator. The calculator will evaluate the RRT. 

RRT Formula

The following two example problems outline the steps and information needed to calculate the RRT.

RRT = Ta / Tr


  • RRT is the RRT ( )
  • Ts is the retention time for analyte 
  • Tr is the retention time for reference 

How to Calculate RRT?

The following steps outline how to calculate the RRT.

  1. First, determine the retention time for analyte. 
  2. Next, determine the retention time for reference. 
  3. Next, gather the formula from above = RRT = Ta / Tr.
  4. Finally, calculate the RRT.
  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.

retention time for analyte = 40

retention time for reference = 30

RRT = Ta / Tr = ?