Home Electricity Cost Calculator
Turn watts, hours and your electricity unit rate into a simple running cost estimate for appliances, heaters, computers and everyday devices.
Formula: kWh = watts / 1000 x hours x days. Cost = kWh x unit rate.
Watts vs kilowatt-hours
Watts measure power at a moment. Kilowatt-hours measure energy used over time, which is what your electricity bill charges for.
Why smart plugs help
A plug-in energy meter or smart plug can reveal actual usage for devices that cycle on and off rather than drawing steady power.
Electricity cost FAQ
Does this include standing charges?
No. This calculator estimates usage cost only, not fixed daily standing charges.
Where do I find watts?
Many appliances show watts on a label, manual or product specification page.