Electricity Cost Calculator
This power cost calculator estimates the energy usage and annual running cost of any appliance. All you need to enter is:
2) Your electricity tariff in cents per kWh. You can find this on your electricity bill. Enter 25 if you don't have a bill handy.
3) An estimate of how often the appliance is used.
Appliance Electricity Cost Calculator:
Tips When Calculating Appliance Running Costs
Some appliances can be switched on 24/7 but only draw power for some of this time. For example, a refrigerator's compressor may only draw power for 8 to 12 hours per day. For these appliances you can either make an estimate based on your observations, or use a power meter.
For other appliances, the power usage can vary a lot. For example, a dishwasher may use 2400W when heating, 50W when pumping water, and 5W in standby. Estimating an 'average power' for these appliances can be tricky. Any appliance which goes through a 'cycle' like this is best measured with a power meter.
Strictly speaking, there are 52 weeks and 1 day in a non-leap year. For simplicity, our calculator ignores this and bases a year on 52 weeks (364 days) only. We think it's easier to calculate energy usage in terms of 'days per week' and 'weeks per year' rather than say 'days per year' or 'hours or year'. For example: many devices operate for 5 days per week, and many people take a holiday for 2 weeks per year.
Example Energy Cost Calculations
Here are some example calculations for common appliances. Enter them above and change the inputs to see the impact. These examples assume an electricity tariff of 25 cents per kWh.
|Pool Pump (1200W)||8h/day||$873.60|
|Fridge / Freezer (140W)||10h/day||$127.40|
|TV (100W on)||5h/day||$45.50|
|TV (5W in standby)||19h/day||$8.65|
|Ducted AC (4500W)||6h/day, 24wk/yr||$1,134|
|Clothes Dryer (2400W)||6h/wk, 50wk/yr||$180|
How to Calculate Electricity Usage Costs
The above power calculator uses a simple formula to calculate annual energy usage and costs. Here's how it works:
Electricity Usage Per Year = (Watts / 1000) * Hours/Day * Days/Week * Weeks/Year = kWh/year
Electricity Cost Per Year = kWh/year * (cents/kWh / 100) = $/year