Electricity Cost Calculator
Work out what an appliance costs to run per day, month and year.
Monthly uses 30 days and yearly 365. Many appliances cycle on and off, so real use can be lower than the rated power.
From watts to running cost
Electricity is billed by the kilowatt-hour — one kilowatt of power drawn for one hour. Multiply an appliance’s power in kilowatts by the hours you use it to get the energy, then by your unit rate to get the cost.
cost = power (kW) × hours × price per kWh
Scaling the daily figure to a month and a year turns a tiny per-hour number into something meaningful — which is exactly why high-power or always-on appliances are worth a closer look.
A 1,000 W appliance run 3 hours a day uses 3 kWh daily. At $0.30 per kWh that is $0.90 a day — about $27 a month or $328.50 a year.
Spotting the costly appliances
It is usually the combination of high power and long hours that drives a bill: heating, hot water, tumble dryers and ovens. Low-power gadgets cost little even left on, while a space heater for a few hours can outweigh a week of phone charging.
Ways to trim it
- Target the big draws. Heating and drying dominate; small electronics rarely matter.
- Mind always-on devices. A modest constant draw over 8,760 hours a year adds up.
- Check your tariff. Off-peak rates can make timing a real saving.