Electricity and Appliances Calculators

To calculate the cost, you need to know the appliance's wattage, how many hours it runs, and your electricity rate. Multiply the wattage by the hours used to get watt-hours. Divide by 1,000 to get kilowatt-hours (kWh), and then multiply by your electricity rate per kWh.

Measured wattage is always more accurate. The rated wattage on the appliance label is the maximum power it can draw. Many modern appliances, especially those with variable-speed motors or compressors, use less than their rated wattage on average.

Appliances like refrigerators, freezers, and air conditioners use thermostats to maintain a specific temperature. They run only when needed (this is called their 'duty cycle'). Because they cycle on and off, they use significantly less electricity than if they ran continuously.

You should use your exact residential electricity rate per kilowatt-hour (kWh), which you can find on your most recent utility bill. This rate can vary significantly depending on your location, time of use, and utility provider.

Estimates are based on average power consumption and standard runtimes. Your actual bill may differ because appliances may run longer or use more power depending on environmental factors (like room temperature) and because bills often include fixed fees, taxes, and tiered rates.