Appliance electricity calculator
What does it cost to run?
Enter the wattage, usage time, and your electricity price. Get an honest hourly, daily, monthly, and yearly estimate in seconds.
Live calculator
Calculate your actual running cost
Running this electric heater for 5 hours a day, 7 days a week uses about 303.3 kWh each month.
Popular calculations
Start with a common appliance
Each guide opens with realistic defaults that you can replace with the numbers from your own appliance.
Transparent method
The calculation, without mystery
We use the standard energy-cost formula and show every assumption. No national average can replace the rate on your own bill.
Better estimates
Use the number the appliance actually draws
The wattage on a label is a useful starting point, but thermostats, compressors, and variable-speed motors can change real consumption. A plug-in energy meter provides the strongest estimate for appliances that cycle on and off.
For dishwashers, washing machines, and fridges, an energy label stated in kWh per cycle or per year may be more accurate than rated watts.
Common questions
Appliance running cost FAQ
How do I calculate the cost of running an appliance?
Divide watts by 1,000 to get kilowatts. Multiply by hours used and then by your electricity price per kWh. For example, a 2 kW heater used for one hour at $0.30 per kWh costs $0.60.
Where can I find my electricity price per kWh?
Look at the unit-rate section of your electricity bill or tariff details. Do not include a fixed daily standing charge because it does not change when an appliance runs.
Does an appliance always use its full rated wattage?
No. Heaters, fridges, air conditioners, and many other devices cycle or vary their power. Rated watts give a useful upper estimate; measured energy use gives a better result.
Are these estimates financial advice?
No. Results are educational estimates. Actual bills depend on the appliance, settings, tariff structure, taxes, and usage pattern.