Enter your kilo-Watt value in the first text box.

Enter your Hours value in the second text box.

Click the Calculate button for the final result.

You can use the Reset button to clear old values.

**Total Cost:** 0.0 $

To calculate the energy E in kiloWatt-hours (kWh), multiply the power P in kiloWatts (kW) by the time period t in hours (h).

To calculate how much energy you use in your home, you need to know the power rating of your appliances in kilowatts (kW) and how long you use them for in hours (h). For example, if you have a 1 kW toaster and you use it for 30 minutes (0.5 hours), the energy used is:

E = P x t = 1 kW x 0.5 h = 0.5 kWh

So, using the toaster for 30 minutes uses 0.5 kiloWatt-hours of energy.