Solar Calculator is an application that calculates the 24 hour energy requirement of a household and based upon that calculates the number of solar panels and batteries required by the solar system. It also calculates the rating of the charge controller and inverter required by the solar system. These are essential components of a solar system. The appliances are grouped together in to five categories namely entertainment, kitchen, air-conditioning, cleaning and lighting. Energy requirement of each category is calculated separately and displayed. The application contains the default wattage of every appliance but the user can also enter a custom value.