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Running cost of an appliance from wattage and usage.
Free to use, no sign-up required. Electricity Cost is one of 198 tools built into Xenition, alongside a chat that can use them for you.
Estimates what an appliance costs to run per day, month and year from its power rating, how long it is on, and what you pay per kilowatt-hour.
Energy per day in kWh = watts ÷ 1,000 × hours. Cost per day = kWh × price. A month is counted as 30 days and a year as 365. The wattage is treated as a constant draw, so appliances that cycle on and off will cost less than shown.
A 150 W appliance on for 8 hours a day uses 0.15 × 8 = 1.2 kWh. At 0.15 per kWh that is 0.18 a day, 5.40 a month and 65.70 a year.
Fridges, heaters and air conditioners cycle their compressors or elements, so they draw full power only part of the time. Enter the hours it actually runs, or use the yearly kWh from its energy label divided by 365.
Watts measure power at a moment. Kilowatt-hours measure energy used over time: 1,000 watts running for one hour is 1 kWh, and that is what your bill charges for.
You do not have to open Electricity Cost to use it. Ask Xenition in plain language and it runs the right tool, then carries the answer into whatever you are working on — a document, a spreadsheet, a deck.