Appliance Energy Cost Calculator
Estimate how much an appliance costs to run per day, month and year.
About the Appliance Energy Cost Calculator
Enter the appliance's power in watts, how many hours a day you use it, how many days a year, and your electricity price per kWh. The calculator gives the energy used and the cost per day, month and year.
Energy use in kilowatt-hours is power (watts) × hours ÷ 1,000. Appliances that cycle (fridges, heaters, air conditioners) draw full power only part of the time, so use the yearly kWh on the energy label when you have it.
The formula
Cost = watts × hours ÷ 1000 × price per kWh
Worked example
A 1,500 W heater used 3 hours a day, every day, at 0.18 per kWh
- Per day: 1,500 × 3 ÷ 1,000 = 4.5 kWh, costing 0.81
- Per year: 1,643 kWh
- Cost: about 295.65 a year, 24.64 a month
Things to keep in mind
- Uses one flat price; time-of-use tariffs and standing charges change the real bill.
Questions people ask
How much does standby use?
Often 1–5 W per device; it adds up across a home.
What uses the most?
Heating, cooling, water heating, dryers and ovens.
Where do I find the price per kWh?
On your electricity bill, as the unit rate.