Enter the peak hour volume (units/hr) and the peak 15 minute volume (units/15min) into the Peak Hour Factor Calculator. The calculator will evaluate the Peak Hour Factor. 

Peak Hour Factor Formula

The following two example problems outline the steps and information needed to calculate the Peak Hour Factor.

PHR = PHV / (4*P15)

Variables:

  • PHR is the Peak Hour Factor ( )
  • PHV is the peak hour volume (units/hr) 
  • P15 is the peak 15 minute volume (units/15min) 

How to Calculate Peak Hour Factor?

The following steps outline how to calculate the Peak Hour Factor.

  1. First, determine the peak hour volume (units/hr). 
  2. Next, determine the peak 15 minute volume (units/15min). 
  3. Next, gather the formula from above = PHR = PHV / (4*P15).
  4. Finally, calculate the Peak Hour 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 hour volume (units/hr) = 30

peak 15 minute volume (units/15min) = 12

PHR = PHV / (4*P15) = ?