What is the Electricity Cost Calculator?
Find what an appliance costs to run per day, month and year.
Enter appliance power, hours used per day and price per unit (kWh) and the Electricity Cost Calculator returns cost per month, cost per day, cost per year and units per month. Results update as you type, and nothing you enter leaves your device.
How it is calculated
Units (kWh) = watts × hours ÷ 1000
Cost = units × price per unit
How to use it
- Enter appliance power in W.
- Enter hours used per day in hours.
- Enter price per unit (kWh).
- Read cost per month in the results panel. It updates as you type.
- Change any value to compare scenarios, or use Share to send the result as a link.
Worked example
Common questions
What formula does the Electricity Cost Calculator use?
It uses: Units (kWh) = watts × hours ÷ 1000; Cost = units × price per unit.
What do I need to use the Electricity Cost Calculator?
You need appliance power, hours used per day and price per unit (kWh). Sensible starting values are filled in so you can see how it works straight away.
Is the Electricity Cost Calculator free, and is my data stored?
It is free with no sign-up. The calculation runs in your browser, so the values you enter are not sent to or stored on our server.