Lexoffice VAT Calculator - Fast, online and completely free of value added tax (VAT). The calculator is specifically designed for the German market. With this practical VAT Calculator you can calculate the VAT included in the sale price. You can also calculate the VAT on the basis of a net price. All this is done by the calculator for you without that you have to manually figure out something. The Lexoffice VAT Calculator is a tool from the Lexoffice Rechnungsprogramm.