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Energy/Electricity Cost Calculator

Hours per Day:
Price per kWh ($):
Cost per Year: $0.00
Cost per Day: $0.00

Replacement unit payback period
Cost ($):
Savings per Year: $0.00
Payback in months: 0


Petrol Cost Calculator
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  • Updated to Dodo rate 32.824 c/kWh from 1 October 2017. Includes GST. Does not include 30% pay on time discount.
  • Updated Red Energy rate to 26.235 c/kWh from January 2014. view
  • Updated Red Energy rate to 25.74 c/kWh from 10th January 2013. view
  • Updated Red Energy rate to 24.750 c/kWh from 1st July 2012. view
  • New Red Energy rate used in calculator. Large increase in Service to property. view
  • Solar feed-in tariff rate cut from 60 cents per kilowatt hour to 25 cents. view
  • Monthly and Annual peak sun hours for locations around Australia. view
  • Why installing solar panels may not be a good investment. view
  • Solar installations giving home owners a disappointing average saving of $200 a year on electricity bills. view
  • Cost to make a cuppa. Kettle vs microwave. view
  • How to work out the payback for installing solar panels. view
  • 35% reduction in electricity usage. view
  • Why I created the Electricity Cost Calculator. view

Money saving devices 

Below are the devices I used to significantly reduce our electriticy bills. We went from 12-14kWh per day to around 6.5kWh per day, saving nearly 50% off our electricity usage cost.

Indoor/Outdoor Weather Station
I noticed that often a cool change had come but we didn't know. By having an indoor/outdoor weather station as soon as the temperature drops outside we open up the house and let nature cool the house down instead of an expensive air-conditioner. Now we only use the air-conditioner on the hotest days. Our sample test revealed that 30% of people continue to use an air-conditioner after the cool change arrives.
Price: Around $40
Foot Switch Operated Mains Outlet
The foot switch is my favourite money saving device. The foot switch is is a mechanical switch and except for a indicator to let you know it is on, uses very little power. Place the foot switch in a convenient location and power off the TV, DVD, Games units all with a single press of your foot. Use it to turn of your computer, monitor and printer. The savings in standby power should pay for this unit in around 6-12 months.
Price: Under $30
Watts Clever Mains power meter
They say knowledge is power, but in this case knowledge is less power. An easy to read screen means you can work out how many watts a device is using and then with the Energy Calculator you can work out which devices are costing you the most. I replaced my kettle so I could boil just the water I needed and that alone will pay for this unit every year. Once you know what a device is costing you, you can make better decisions.
Price: Under $30
Mains power meter
This is a lower cost power meter. The smaller display is harder to read, but since you'll only want a meter to measure devices once, this unit will pay for itself many times over.
Price: $20-$30


Watts: Enter the watt rating for the appliance. For a light this is found on the light. For more complex items such as the standby power used by a television, you will need a device to measure the power.

Hours: Enter the number of hours you use the appliance for per day. If you use the appliance for less than an hour enter the time as a decimal. That is half an hour is 0.5. If you use the item once a week, or once a month, first divide the time by the number of days. E.g. Iron once a week for 2 hours. Divide 2 by 7 which gives 0.28 hours per day.

Price/kWh: This is the price the energy company sells electricity to you including GST. The default price is for Red Energy which is 21.45 cents as at 1 January 2011. This is not an endorsement for Red Energy, just a base rate to work with. Check your rate from your latest electricity bill. The price you enter will stay until you close the page.

Cost/Year: This figure is the cost per year of using the appliance.

Cost/Day: This figure is the cost per day of using the appliance.

Replacement unit payback period

Cost: This is the cost of the new appliance that you are thinking of buying to replace the existing appliance.

Watts: This is the watts used by the new appliance.

Savings per year: This is the savings made by using a lower energy unit. A negative value means it is costing more.

Payback period in months: This is how long it will take to pay off the new appliance based on the energy saved.

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