UK VAT Calculator is a free online tool designed to quickly add or remove VAT at standard (20%), reduced (5%), or zero (0%) rates. It allows users to calculate VAT-inclusive and VAT-exclusive prices with ease, making it useful for businesses, freelancers, and individuals managing invoices or pricing. The tool also includes a flat rate comparison feature, helping users assess VAT obligations under different schemes. It provides fast and accurate results without requiring registration.