Apr 122012
Online Power Usage Calculator – Consumers Power
http://www.consumerspower.org/home_energy/billestimator.php
To calculate an estimated monthly electrical bill for your home, please select a QUANTITY in the applicable Electrically Powered Items field. Once you’ve filled out the fields that are relevant to your home, click the “Calculate” button at the bottom of this form.
Or search for “domestic power usage calculator”