The PreTaxPrice app is a free online application that calculates the actual price prior to taxes on any total including tax. This reverse tax calculator works in your browser to keep all of your transactional information private. It supports batch functionality to process entire months of transactions in one go. Accountants can use it for accounting purposes, freelancers for expense tracking purposes, and consumers for taxation purposes. No registration is needed. More than 517,000 calculations take place each week using the service.