All Purpose Softwares Watt-U-Use is a financial utility software that allows you to calculate cost per hour and cost per day for each and every appliance of your home. Using this home energy calculator you can create estimations for the energy bills with specified time frames such as monthly, quarterly and yearly and also enables you to estimate for the next utility bill. This financial tool is capable of providing admin with comparative results focusing on the least and most expensive appliance of their daily usage. Key features includes built-in web form, options to have kilowatt hourly charge rates, calculations based on any two variables of watts, ampere and voltage, etc.