Enter the reactor volume (mL) and the flow rate (mL/min) into the Residence Time Calculator. The calculator will evaluate the Residence Time. 

Residence Time Formula

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

RT = V / Q


  • RT is the Residence Time (min)
  • V is the reactor volume (mL) 
  • Q is the flow rate (mL/min) 

To calculate residence time, divide the reaction volume by the flow rate.

How to Calculate Residence Time?

The following steps outline how to calculate the Residence Time.

  1. First, determine the reactor volume (mL). 
  2. Next, determine the flow rate (mL/min). 
  3. Next, gather the formula from above = RT = V / Q.
  4. Finally, calculate the Residence Time.
  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.

reactor volume (mL) = 567

flow rate (mL/min) = 30

RT = V / Q = ?