Free calculators that turn watts, kWh and electricity rates into money, in US dollars and UK pounds. Each one uses the same official rates as our articles and shows how it works.
Appliance electricity cost calculator
Pick an appliance, adjust the hours, and see the cost per hour, day, month and year. Add several appliances to build a monthly estimate. Open the calculator.
kWh cost calculator
Turn kilowatt-hours into money and check what your bill should be, including fixed daily charges. Open the calculator.
Watts to kWh calculator
Convert an appliance’s watts into the kWh you are billed for, per hour, day, month and year. Open the calculator.
How the numbers are worked out: our methodology.