This simple calculator allows, in addition to the basic mathematical operations, calculations to VAT, VAT included and VAT excluded for various countries of the world. With its three screens allows the values ​​and calculations made in one of them to automatically be reflected in the others. All European Union countries as well as many others are included, with their respective VAT/GST/HST/PST/Consumption Tax rates. (More countries to come) It also allows the creation of custom rates for the