About CalcTool

CalcTool is a free collection of 60 calculators and tools for everyday life in the UK: take-home pay, tax, mortgages, stamp duty, health, dates, maths, text and more. There's nothing to sign up for and nothing to install.

Private by design

Every calculation runs in your own browser. The numbers you type aren't sent to us or stored anywhere. The only exception is the currency converter, which downloads the day's exchange rates from a public source.

Accurate and up to date

UK tax figures are for the 2026/27 tax year (6 April 2026 to 5 April 2027) and are checked against gov.uk. Every calculation is tested against worked examples. Results are estimates for information only, so read our disclaimer before relying on them for a big decision.

Who we are

CalcTool is built and run by Fynlo Digital, a small UK software business. Spotted a mistake or want a new tool? Get in touch.

How the site is funded

CalcTool is free to use. It may show adverts and, on some pages, links to products we think are relevant. If you sign up through one of those links we may earn a commission, at no extra cost to you. This never changes the results a calculator gives you.