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Electricity Cost Calculator
Find what an appliance costs to run each day, month and year from its wattage and your price per kWh.
Electricity cost calculator
Power: — · Energy per day: —
Cost per day: —
Cost per month: — over an average month
Cost per year: — · Energy per year: —
—
How to use the Electricity Cost Calculator
- Enter the power rating in watts from the appliance label.
- Add the hours used per day, the days per year and your price per kWh.
- Read the daily, monthly and yearly costs and the energy used.
Features
- Daily, monthly and yearly running cost
- Energy used in kilowatt hours
- Works from watts, hours per day and days
- Runs locally, no uploads
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Frequently Asked Questions
Common questions about the free online electricity cost calculator.
Multiply its wattage by the hours it runs to get kilowatt hours, then multiply that by the
price you pay for each kilowatt hour.
One kilowatt hour is the energy a 1000 watt appliance uses in one hour, and it is the unit
electricity suppliers bill you for.
Watts divided by 1000 gives kilowatts, multiplied by hours per day gives daily kilowatt
hours, which are then priced.
30.44 is the average length of a month across a year, so it gives a fair monthly cost instead
of assuming 30 or 31 days.
It uses the number of days you enter, so set 365 for an appliance used every day, or fewer
for seasonal use.
Yes. Note the yearly cost of the first appliance, then enter the second one and compare the
two yearly figures.
Standby use, other appliances, taxes, standing charges and time of use tariffs all affect the
final amount you are billed.
Run appliances at full loads, lower heating and cooling settings, switch to LED bulbs and
turn devices off at the wall.
No. The calculator runs entirely in your browser, so your appliance figures never leave your
device.
Yes. It is completely free, needs no account and places no limit on how many appliances you
check.
Last updated: October 10, 2026