Appliance Running Cost Calculator Australia

How the appliance running cost calculator works

For the power-and-usage method, HomeBillLab uses the standard relationship between electrical input power, time and electricity price:

If the appliance rating is in watts, divide watts by 1,000 to convert it to kilowatts. For example, 2,000 W is 2 kW. The Australian Government uses the same basic method when explaining household appliance running costs: a 2 kW appliance at 28 cents per kWh costs $0.56 per hour, and five hours of use costs $2.80 for that day.

Use the electricity rate from your own bill

Electricity prices vary by plan, location and tariff structure, so this calculator deliberately does not insert one fixed “Australian average” rate. Enter the variable usage or consumption charge shown in cents per kilowatt-hour (c/kWh) on your electricity bill. The daily supply charge is excluded because it is a fixed household charge rather than a cost caused by one appliance.

If you are on a time-of-use plan, the most useful estimate may be to run separate scenarios using the peak, shoulder or off-peak rate that applies when the appliance is normally used. This is more transparent than pretending one blended tariff applies to every household and every hour.

When watts × hours is useful — and when it is not

The simple power method works well when the electrical input power is reasonably representative while the appliance is operating. It can be useful for devices such as portable heaters, fans, lamps, cooking appliances, pumps and many electronics when you know the input watts and a realistic operating time.

However, rated or maximum watts are not always the same as average power over time. Fridges cycle on and off. Washing machines and dishwashers move through different stages. Televisions can change power with settings and content. Some devices use standby power. Where operation varies substantially, a measured energy figure or the annual kWh value on an Energy Rating Label can give a more practical starting point.

Using an Energy Rating Label annual kWh figure

For regulated appliances, the Energy Rating Label shows estimated energy consumption in kilowatt-hours based on standardised testing. The official running-cost relationship is:

For example, the Australian Government Energy Rating guidance gives a fridge example using 458 kWh per year and a tariff of $0.307 per kWh, producing an estimated annual running cost of $140.61. Your own result can differ because the label is based on standardised assumptions and your real usage, settings and tariff may be different.

What the estimate includes

• Electricity consumed by the appliance under the inputs you enter.
• Your variable electricity usage rate in c/kWh.
• Hourly, daily, weekly, monthly-average and yearly estimates for the power method.
• Daily, weekly, monthly and annual averages when using annual Energy Rating Label kWh.

What the estimate does not include

• Daily electricity supply charges.
• Future tariff changes.
• Solar self-consumption, feed-in tariffs or battery behaviour.
• Changes in appliance power caused by thermostats, cycling, standby, different programs or operating conditions unless those effects are already reflected in the kWh figure you enter.

A quick worked example

Suppose an appliance draws 1,500 W (1.5 kW), runs for three hours on each active day, is used five days a week, and your electricity usage rate is 30 c/kWh. The estimate is 4.5 kWh per active day, 22.5 kWh per week and 1,170 kWh per year if that weekly pattern repeats for 52 weeks. At 30 c/kWh, that is $1.35 per active day, $6.75 per week and about $351 per year.

Frequently asked questions

How do I calculate appliance electricity cost from watts?

Divide watts by 1,000 to get kilowatts, multiply by hours of use to get kWh, then multiply by your electricity rate in dollars per kWh. The calculator performs those steps automatically.

Should I use the supply charge from my electricity bill?

No. For an appliance running-cost estimate, use the variable usage or consumption rate. The supply charge is a fixed household connection charge and is not normally attributable to one appliance.

Is the Energy Rating Label kWh figure my exact future energy use?

No. It is an estimate from standardised testing and usage assumptions. Your actual electricity use can be higher or lower depending on how the appliance is used, its settings and operating conditions.

Why does HomeBillLab not use one national electricity rate?

Australian household tariffs vary by plan and location, and some customers have time-of-use pricing. Your own bill is therefore a more useful input than a hidden national-average assumption.

Sources and methodology

This calculator follows Australian Government household energy guidance and Energy Rating Label methodology. See energy.gov.au energy ratings guidance and the Energy Rating Label guidance. For HomeBillLab’s calculation standards, see our Methodology and Sources.

Related: Appliance Running Cost Guide Australia · Electricity Costs & Tariffs Guide Australia · Australian Home Energy Calculators.

Reviewed: 21 August 2026. This calculator provides estimates for information and comparison; it is not an electricity retailer quote or a guarantee of future bills.