How to calculate what your appliances cost to run
- Pick a common appliance from the list, or add a blank row and type its name.
- Enter its power in watts, the hours it runs per day, and how many you have.
- Enter your electricity price per kWh from your bill.
- Read the cost per day, month, and year for all appliances together, and the monthly cost of each row.
Monthly figures use an average month of about 30.4 days. Standby power is not included unless you add it as its own row, for example a TV in standby at 1 W for 20 hours.
Questions
Is my data uploaded anywhere?
No. The costs are calculated in your browser and nothing is sent or saved.
How do you calculate the electricity cost of an appliance?
Energy in kWh = watts × hours ÷ 1000. Multiply by your price per kWh to get the cost. A 100 W TV used 4 hours a day uses 0.4 kWh a day, which is 12 kWh a month.
Where do I find the watts of my appliance?
Look for a label on the back or bottom of the device, or in the manual. If it only lists amps, multiply by your mains voltage. The presets are typical values to start from and can be edited.
What price per kWh should I enter?
Use the rate on your latest electricity bill. If the bill has several charges, add the energy rate and any per-kWh delivery fees. The tool shows costs in whatever currency you use.
Why are fridges and heaters hard to estimate?
They switch on and off with a thermostat, so their average draw is lower than the label wattage. For a fridge, 100 W over 24 hours is a reasonable guess. For heaters and air conditioners, count the hours they actually run.
Credits
Built by OneTooling using standard browser features. No third-party code runs on your data.