About UK VAT Calculator

UK VAT Calculator is a free, focused tool for adding or removing UK VAT from a single amount. It is aimed particularly at freelancers, sole traders, contractors and small businesses that need a quick answer without opening accounting software.

A free tool from Klamic

The calculator is made by Klamic, a UK invoicing service built around a simple idea: “I don’t need accounting software. I just need to send an invoice.” The Klamic link is a natural next step for users who have calculated VAT and are ready to invoice.

Our approach

We keep the calculator narrow, show the net, VAT and gross figures clearly, explain the maths, and link to current official guidance where VAT rules matter. We do not try to turn this page into a VAT-return, Flat Rate Scheme, margin-scheme or reverse-charge calculator.

Independence

This is an independent calculator. It is not an HMRC or GOV.UK service and is not approved, endorsed or affiliated with HMRC.