Strictly speaking, there are 52 weeks and one day in a non-leap year. 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'. Any device that goes through a 'cycle' is best measured with a power meter. Estimating an 'average power' for these appliances can be tricky. For example, a dishwasher may use 2400W when heating, 50W when pumping water, and 5W on standby. You can either estimate based on your observations or use a plug-in power meter.įor other appliances, the power usage can vary a lot. For example, a refrigerator's compressor may only draw power for 8 to 12 hours per day. Some appliances can be switched on 24/7 but only draw power for a portion of this time. Examples include LED light bulbs, heaters, pumps, motors, and portable fans. The electricity cost calculator on this page is ideal for appliances with a reasonably constant power draw. They monitor your entire household's energy usage from one device! Tips When Calculating Appliance Running Costs Our range of Wireless Energy Monitors takes things a step further. It calculates instantaneous power usage (Watts), energy usage (kWh over time), cost, and much more. The Reduction Revolution Power Meter is one of our most popular products. As the saying goes: garbage in, garbage out - so please be careful when entering your data!įor this reason, we sell several devices to help you calculate the cost of running your appliances with much greater ease and accuracy. But it also has low accuracy (as it is based solely on estimates), and it cannot log actual energy usage over time. The above electricity usage calculator is quick, free, and easy to use. Here's how it works:Įlectricity Usage Per Year = (Watts / 1000) * Hours/Day * Days/Week * Weeks/Year = kWh/yearĮlectricity Cost Per Year = kWh/year * (cents/kWh / 100) = $/year Two Other Ways To Calculate Your Electricity Costs Our power calculator uses a simple formula to calculate annual energy usage and costs. A loss that goes down to just 1 or 2W when you switch to an LED MR16 light bulb. *A 50W halogen light bulb loses an extra 15W in the transformer. These examples assume an electricity tariff of 25 cents per kWh. Enter them in our calculator above, change the inputs, and see the impact. Here are some example calculations for everyday appliances. Note: our affordable power meters do some of these calculations for you.
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