How Much Electricity Does My Laptop Use. As battery life is always a concern with a laptop I was particularly curious to see which parts of the laptop draw the most power. For an accurate calculation and product recommendation please input components for an entire system.

Our energy calculator allows you to calculate the running cost of any electrical items using a range of electricity tariffs. Even if I assume my laptop wattage to be 100 watt and use it for 24 hours in a day throughout the month I can expect monthly power consumption of my laptop to be just 72 kWh. Hence the question how much power is my PC using is often asked.
So I ran a few tests with my trusty kill-a.
A desktop uses an average of 200 Whour when it is being used loudspeakers and printer included. Simply enter the amount of electricity the appliance uses in Watts or KiloWatts and the length of time it is used in Hours or Minutes then instantly see the cost. If your electricity costs 15p per unit then multiply 12kWh by 15p and you get a grand total of 180p or 180. As others have noted your units are nonsense.
