Electricity Cost Calculator
Work out the units used and the running cost of any appliance from its watts, hours and your own rate.
- Units used (kWh)
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- Cost per day
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An estimate only. Your bill may include fixed charges and taxes not counted here.
What is the Electricity Cost Calculator?
This calculator estimates the electricity an appliance uses and what it costs to run. Enter its power in watts, the hours used each day, the number of days and your rate per unit from your bill. It shows the units in kilowatt-hours, the total cost and the cost per day.
How it works
Units in kilowatt-hours are watts multiplied by hours per day and by days, divided by 1,000. The cost is the units multiplied by your rate per unit. The cost per day is the daily units multiplied by the rate. The rate is whatever you type in.
How to use it
- Enter the appliance power in watts, as printed on its label.
- Enter the hours it runs each day.
- Enter the number of days.
- Enter your rate per unit from your bill and read the cost.
Electricity Cost Calculator — FAQ
What is a unit of electricity?
One unit is one kilowatt-hour, which is a 1,000 watt appliance running for one hour.
Where do I find the rate per unit?
Check your electricity bill or your supplier. Rates differ by state, slab and connection type, so this tool asks you to type yours.
Why might my actual bill be higher?
Appliances rarely draw full rated power all the time, and bills may add fixed charges, duties and taxes that this tool does not include.