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Estimate the running cost of an appliance from wattage, daily use, and electricity rate.
Use this appliance electricity cost calculator to estimate what a household device costs to run. It turns watts, usage time, and tariff rate into daily, monthly, and yearly cost estimates you can actually budget with. The calculator is designed to give a fast answer, but the quality of the answer still depends on accurate inputs and a clear idea of what decision you are trying to support.
- Enter Appliance Wattage, Hours Used per Day, and Electricity Rate using the same units you plan to compare or report.
- Read the main estimated monthly appliance cost first, then use the supporting outputs to understand the trade-offs behind that result.
- Compare your numbers with the worked examples below if you want a quick reasonableness check.
The result turns power draw into an actual money estimate, which makes it easier to compare appliances than looking at watts alone. On this page, the primary output is estimated monthly appliance cost.
Scenario 1: 900 W appliance used 4 hours daily at $0.18 per kWh. Inputs used: powerWatts: 900, hoursPerDay: 4, ratePerKwh: 0.18. Example result: $19.44. This appliance usage pattern produces an estimated monthly cost of $19.44. Scenario 2: 150 W appliance used 18 hours daily at $0.24 per kWh. Inputs used: powerWatts: 150, hoursPerDay: 18, ratePerKwh: 0.24. Example result: $19.44. A lower-wattage appliance that runs most of the day still works out to $19.44 per month.
Core formula: daily kWh = (watts / 1000) * hours; cost = kWh * rate. The calculator converts appliance wattage into daily energy use, then applies your electricity rate to estimate recurring cost over longer time periods.
- The model assumes the appliance draws the same power whenever it is on.
- Bills can differ if tariffs change by time of day or include fixed charges.
Use this calculator when budgeting household energy use, comparing appliances, or checking whether an always-on device is costing more than expected. Related paths for follow-up analysis include air conditioner electricity cost calculator, heater electricity cost calculator, electricity cost calculator, and celsius to kelvin calculator.
Most bad outputs come from a few repeated input errors or interpretation mistakes. Use this short checklist before relying on the result.
- Using label wattage when real-world power draw changes during operation.
- Ignoring standby use or duty cycles for devices that switch on and off.
- Comparing estimated running cost without checking the actual tariff on the utility bill.
