Energy Consumption Calculator
Calculate how much electricity a device consumes and what it costs: enter power or current+voltage, hours of use per day and the price per kWh.
Power draw
100 W
Consumption
24.0 kWh
0.80 kWh per day
Estimated cost
144.00
Frequently asked questions
How is consumption calculated?
Power (W) × hours per day ÷ 1000 = kWh per day, multiplied by the number of days and the price per kWh.
How do I find the power of a device?
Look at the label (W), or calculate from current and voltage: P = U × I. A phone charger might show 5V 2A, which is 10 W.
What tariff should I enter?
Check your electricity bill for the price per kWh — it varies by region, provider and time of day.