Enter the total number of watt-hours and the total cost of electricity into the calculator to determine the cost per watt hour.

Cost Per Watt Hour Formula

The following equation is used to calculate the Cost Per Watt Hour.


  • Where CPWH is the cost per watt-hour ($/wh)
  • EC is the electricity cost ($)
  • P is the total power in watt-hours

To calculate the cost per watt hour, divide the electricity cost by the number of watt-hours.

What is Cost Per Watt Hour?


A cost per watt hour is a unit of measure used to describe the cost per unit of power times time. Power times time in this case is watt-hours. This is used most often when looking at utilities and determine the cost per usage.

How to Calculate Cost Per Watt Hour?

Example Problem:

The following example outlines the steps and information needed to calculate Cost Per Watt Hour.

First, determine the total electricity cost. In this example, the total electricity cost is $350.00.

Next, determine the number of watt-hours. In this case, the watt-hours are found to be 10 wh.

Finally, calculate the cost per watt hour using the formula above:


CPWH = $350 / 10

CPWH = $35 / watt-hour