Determine the wattage of the device then perform this simple calculation:
Step 1:
- # of watts
- x # of hours used
- x .001
- = kWh used
Step 2:
- kWh used
- x .086 (cost per kWh)
- = Cost
Remember, electronic devices equipped with transformers (ie cell phone chargers, printers, cable tv boxes, dvr’s etc.) and other "plugload" devices draw phantom loads even when the device is off.