Understanding electricity costs helps households and businesses budget for utility bills and evaluate the cost-effectiveness of appliances, especially those that run for extended periods. This electricity cost calculator computes the running cost of an appliance or device based on its power consumption (in watts), how many hours it operates, and your electricity rate (cost per kilowatt-hour). It's useful for comparing the running costs of different appliances, understanding which devices contribute most to your electricity bill, or evaluating whether upgrading to a more energy-efficient model would pay for itself through savings. Simply enter the appliance's wattage, usage hours, and your electricity rate to see the cost per day, month, or year.