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Electricity Cost Calculator: Cost of Running Any Appliance

This free electricity cost calculator shows what an appliance costs to run. Enter its power in watts, how long you use it and your price per unit of electricity, and read the daily, monthly and yearly cost.

By Debmedia Technologies LLP · Kolkata, India · Updated

What Is It and When Do You Need It?

Electricity is billed by the kilowatt-hour. To know what a heater, an air conditioner or a computer costs, you need its power and how long it runs.

Enter the three numbers and read the cost.

How to Use This Tool

  1. Enter the appliance power in watts.
  2. Enter the hours used per day and the price per unit.
  3. Enter days per month and the number of appliances.
  4. Press Calculate.

How the Calculation Works

Energy per day = watts ÷ 1000 × hours × number of appliances, in kWh. Cost per day = energy × price. Monthly cost uses the days per month you enter, and the yearly cost is the daily cost times the days per month times 12.

Worked Example

A 1,500 W heater used 8 hours a day uses 12 kWh a day. At 0.15 per kWh, that is 1.80 a day, 54.00 for 30 days and 648.00 for a year.

Common Uses

  • Comparing appliances.
  • Budgeting for heating and cooling.
  • Checking if a replacement pays off.
  • Understanding a bill.

Tips and Common Mistakes

  • Thermostat-controlled devices do not run all the time, so the real cost is lower.
  • LED bulbs cost a fraction of old bulbs.
  • Check your tariff for peak and off-peak prices.

Next, you may need the fuel trip cost calculator, Ohm’s law calculator, mortgage calculator, LED resistor calculator.

Everything runs in your browser. Nothing you type is uploaded, stored or sent to any outside service.

Frequently Asked Questions

Look at the label on the back or base. It shows watts (W) or amps and volts. Multiply amps by volts to get watts.
A kilowatt-hour is one kilowatt used for one hour, also called one unit on many bills. A 1,000 W heater running for an hour uses 1 kWh.
Cost = watts ÷ 1000 × hours × price per kWh.
No. Many devices use a few watts on standby, which you can add as a separate appliance.

Disclaimer: results are calculated in your browser from the numbers you enter. Check important results before you rely on them for money, health, safety or legal decisions.