Desktop computer: what does it cost to run?
Calculate the cost, compare common appliances, and get one practical saving idea — instantly.
Estimated monthly cost
$8.64A small change based on your numbers
Your energy coach
High-power appliances respond best to shorter use, timers, and efficient temperature settings.
Use it one hour less each day
$13.14Possible saving per yearTry a common appliance
One tap. Real numbers.
Whole-home energy check
Where does your home's electricity go?
Build a quick appliance list. WattWorth totals the bill and shows the biggest energy users.
Compare before you plug in
Compare before you plug in
Two appliances can do a similar job at very different monthly costs.
Space heater costs less
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Find the wattage
Check the label, manual, or power adapter.
Add your usage
Estimate the hours used on a typical day.
Use your tariff
Enter the price per kWh from your bill.
Popular appliance guides
48 guides foundHow appliance electricity cost is calculated
Power in kilowatts × hours used × electricity price gives the running cost. WattWorth performs the formula and projects it across a month and year.
What is a kilowatt-hour?
A kWh is the energy used by a 1,000-watt appliance running for one hour.
Is standby power included?
Add standby wattage separately if a device stays plugged in.
Why can my bill differ?
Taxes, fixed charges, variable tariffs, and real usage patterns can change the final bill.
electricity calculations completed