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.

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