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.

CPWH = EC / P
  • 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 the Cost Per Watt-Hour?

Definition:

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 determining 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 = EC / P

CPWH = $350 / 10

CPWH = $35 / watt-hour

FAQ

What factors can affect the cost per watt-hour?

The cost per watt-hour can be affected by several factors including the source of electricity (solar, wind, coal, etc.), the time of day (peak hours vs off-peak hours), geographical location, and the efficiency of the appliances or systems using the electricity. Changes in these factors can lead to fluctuations in the electricity cost, thereby affecting the cost per watt-hour.

How can I reduce my cost per watt-hour?

Reducing your cost per watt-hour can be achieved by improving energy efficiency in your home or business, using energy-efficient appliances, and considering renewable energy sources like solar panels. Additionally, being mindful of using electricity during off-peak hours when rates are lower can also help reduce costs.

Is the cost per watt-hour the same as the cost per kilowatt-hour?

No, the cost per watt-hour (Wh) and the cost per kilowatt-hour (kWh) are related but not the same. 1 kilowatt-hour is equal to 1000 watt-hours. Therefore, the cost per kWh is a more common measurement for electricity billing and represents the cost of using 1000 watts for one hour. To convert cost per watt-hour to cost per kilowatt-hour, you would multiply the cost per watt-hour by 1000.