This calculator uses the average watt rating (100 Watts) for a Laptop Charger. You can input your Laptop Charger’s details to calculate the exact usage and cost of your device.
Enter how many hours per day you estimate you run your Laptop Charger. If it is less than one hour use a decimal. For example, 30 minutes would be .5 and 15 minutes would be .25.
Input the wattage of your Laptop Charger. If you are unsure enter the average wattage for a Laptop Charger: 0.
Enter the price per kilowatt-hour (kWh) you pay for electricity. If you are unsure you can use the average rate per kWh in the US (10 cents) or find the the kWh rate in your area here.