ENERGY COST ESTIMATOR

Ever wonder how to calculate how much energy your appliances use?

Below is a simple calculation to help you figure out your appliance wattage.

Electricity bills are based in part on the number of kilowatt-hours a member uses during a billing period. For ease of reference, you can use the following formula:

  • Appliance Wattage × hours used per day ÷ 1000 = Daily Kilowatt-hour (kWh) consumption
  • 1 kilowatt (kW) = 1,000 Watts

Multiply your kWhs by the number of days you use the appliance during the year for the annual consumption in kWhs per year.

  • Total kilowatts (kW) x number of days

To determine the wattage of the appliance look on the back or bottom of the appliance.

You can then further calculate the cost of energy by multiplying your total monthly kWhs by your energy rate, as shown below.

The following are a few examples of energy consumption and costs per year.

Window fan:
(200 Watts × 4 hours/day × 120 days/year) ÷ 1000 = 96 kWh × .0850 cents/kWh = $8.16/year

Personal Computer and Monitor:
[(120 Watts + 150 Watts) × 4 hours/day × 365 days/year] ÷ 1000 = 394 kWh × .0850 cents/kWh = $33.50/year