Electricity Cost Calculator
What any appliance costs to run, per day, month and year.
The math
Watts × hours ÷ 1000 = kilowatt-hours, and kWh × your tariff = cost. A 150 W device running 8 hours a day uses 1.2 kWh daily, which at $0.15/kWh is about $66 a year.
Nameplate watts vs. actual watts
The label shows maximum draw, not typical draw. A '700 W' fridge cycles on and off and might average 100 W; a gaming PC idles far below its power supply rating. A $15 plug-in energy meter gives you the real number. Heaters, kettles and dryers are the honest ones: they really do pull their rated watts the whole time they run, which is why heating anything is what actually moves your bill.