Enter the peak stress and the nominal or average stress into the Stress Concentration Factor Calculator. The calculator will evaluate the Stress Concentration Factor. 

Stress Concentration Factor Formula

The following two example problems outline the steps and information needed to calculate the Stress Concentration Factor.

Kt = PS / NS


  • Kt is the Stress Concentration Factor ( )
  • PS is the peak stress 
  • NS is the nominal or average stress 

To calculate the stress concentration factor, divide the peak stress by the nominal stress.

How to Calculate Stress Concentration Factor?

The following steps outline how to calculate the Stress Concentration Factor.

  1. First, determine the peak stress. 
  2. Next, determine the nominal or average stress. 
  3. Next, gather the formula from above = Kt = PS / NS.
  4. Finally, calculate the Stress Concentration Factor.
  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.

peak stress = 5000

nominal or average stress = 4000

Kt = PS / NS = ?