Nightroll

Free Electricity Cost Calculator

Enter an appliance’s power and use to see what it costs to run.

Results

Energy per day–
Cost per day–
Cost per month–
Cost per year (every day)–

How to make an electricity cost

  1. Enter the appliance’s power in watts (on its label).
  2. Enter the hours a day it runs and the days a month.
  3. Enter your price per kWh from your bill.

Frequently asked questions

What is a kWh?
A kilowatt-hour: 1,000 watts for one hour. A 2,000 W heater running for 30 minutes uses 1 kWh.
Is my data stored?
No. Everything happens in your browser and your inputs are saved only on this device.