Energy Use & Cost

Energy Use & Cost calculators — each with the formula, a worked example and a reference table. Results are estimates for planning and education; verify all sizing with a licensed electrician and your AHJ.

Appliance Energy Cost

Find out what any appliance costs to run. Enter its power in watts, how many hours a day y…

Electricity (kWh) Cost

A quick way to turn watts and hours into kilowatt-hours and a dollar cost. Enter the power…

EV Charging Cost

Estimate what it costs to charge an electric car at home. Enter the battery size, the star…