Always-on device and smart plug running cost
Work out how much a device costs when it stays plugged in, whether it is a charger, a box, a speaker or a smart plug of its own. Enter its power, the hours per day it draws that power and the price you pay per kWh.
Enter your values, then calculate.
Method and limitations
Energy per year in kWh = power in watts × hours per day × 365 ÷ 1000. Cost per year = energy per year × price per kWh. Cost per month = cost per year ÷ 12. Energy is shown to one decimal place and costs to two. Every value comes from you: the tool assumes no power, no hours and no price.
Sources
No external reference is documented for this calculation; its method and limitations are described above.
