Calc4Living

Home Energy · Free calculator

Appliance Cost Calculator

Estimate an appliance’s electricity consumption and running cost using its rated wattage, daily operating time and your local electricity price.

Your inputs

All fields are required. Prefilled values are an editable example, not local price or usage recommendations.

No exchange rates or conversion. Enter electricity prices in the selected currency per kWh, not in cents or pence. Changing currency clears the result.

Electrical input from the label or a measured average. This is not heating or cooling output.

Average daily hours drawing the entered power, from 0 to 24.

Enter major currency units per kWh: for example, 0.20 means 20 cents or pence, not 20.

Whole days, 0–366. The period result uses this value; monthly and annual comparisons use 30 and 365 days.

Your estimate

Energy & running cost

Review the example inputs, enter your local electricity price, then calculate. Results clear when inputs change so an old estimate is never shown for new values.

How much electricity does an appliance use?

Daily energy (kWh) = rated watts ÷ 1,000 × equivalent operating hours per day. Period cost = daily energy × days × electricity price per kWh.

Worked example

A 150 W appliance operating at that power for 8 hours/day uses 1.2 kWh/day. At 0.20/kWh, that costs 0.24 daily, 7.20 over 30 days and 87.60 over 365 days.

Example amounts use whichever currency you select; they are arithmetic illustrations, not quoted local rates.

Assumptions & limitations

  • Nameplate wattage may be a maximum rather than average consumption. Fridges, heaters, washers and other cycling or variable-speed appliances rarely draw rated power continuously.
  • Use equivalent hours at rated power or measured average consumption to improve the estimate. Standby use, different cycle stages and seasonal usage are not automatically modeled. A plug-in energy meter or energy label may provide a better starting point.
  • One flat rate is applied; fixed supply fees, time-of-use rates and separate taxes are not modeled.

Further reading