Everyday
Home Energy Cost Calculator
List your appliances with their wattage and hours of use, enter your price per kWh, and see what each one costs to run per day, month and year.
Example price — replace it with the rate on your electricity bill.
Appliances
That’s the most this list can hold (100 appliances).
Quick add
Example values — check your appliance’s label or manual for its real wattage.
Running costs
Saved in this browser only.
Frequently asked questions
How is the cost worked out?
For each appliance, watts × quantity × hours a day ÷ 1,000 gives the kilowatt-hours (kWh) it uses on a day it runs. That times the days a year it runs gives kWh a year, and kWh × your price per kWh gives the cost; a month is the yearly cost ÷ 12. For example, a 100 W TV on for 4 hours a day uses 0.4 kWh, so 365 days is 146 kWh, which at 0.15 per kWh is 21.90 a year.
Where do I find the wattage and my price per kWh?
The wattage is usually printed on a label or plate on the appliance, often on the back or underneath, or in its manual. Your price per kWh is on your electricity bill. If the bill shows more than one rate, the calculator uses whichever single rate you enter.
Why do fridges, freezers and heaters need care?
They switch on and off by themselves, so their rated watts × 24 hours is more than they really use. Enter the hours they actually run if you know them, or use the yearly kWh on the energy label: 365 kWh a year is 1 kWh a day, which you can enter as 1,000 W for 1 hour a day.
Where is my list kept?
Your appliances, price and currency are saved in this browser only, on this device. Nothing you type is sent anywhere, and “Clear saved data” removes it.
These calculators give estimates to help you think — not financial, tax or legal advice. Double-check anything that matters with a professional.