Energy Calculating System For Home Electrical Appliances (ECaS) is developed to support, monitor, measure and display instantaneous electricity energy consumption for an individual usage. Large energy consumers wants better data monitoring system to make energy management decisions and utilities need more data to improve their services. Therefore, ECaSwith value-added services such as automatic electricity energy usage reading system and monthly electric tariff billing system for an individual usage is an ideal system to support all the above requirements.