About Calcsmith

Calcsmith is built to be the fastest, cleanest set of UK finance calculators on the web. We focus on three things: accuracy, speed, and respect for your time.

Every calculator is privacy-first — calculations run entirely in your browser. Nothing you type is sent to a server, stored, or shared. There are no accounts, no email capture, and no nudges to upgrade.

We update the rates, allowances, and bands every UK tax year. The site currently reflects the 2026/27 rules from HMRC and HM Land Registry.

Read more about our methodology or browse the UK calculators.