About CalcMondo

CalcMondo provides free personal finance calculators and plain-English guides for people in the UK. Our aim is simple: help you make better money decisions with tools that show their workings and cite official sources.

What we offer

• Calculators for take-home pay, Income Tax, National Insurance, student loans, VAT, mortgages, loans, savings, pensions and State Pension age.
• Guides that explain the rules behind the numbers – pensions, tax changes, mortgages, savings and budgeting.
• Downloadable PDF summaries of every calculation, so you can keep a record or share it with an adviser.

How we work

• Every calculator runs on a versioned rule file for each tax year (currently 2026/27).
• Rates and thresholds are checked against GOV.UK and HMRC publications, and the sources are listed on each calculator page.
• Calculations run in your browser – we do not ask for your name, and inputs are not stored.
• We write original content and do not publish unverified statistics.

Who we are

calcmondo.com is operated by SMARTICPRO LTD, a company registered in the United Kingdom (Company No. 14905166), 71-75 Shelton Street, Covent Garden, London, WC2H 9JQ. Content is researched, written and reviewed by the Calcmondo Editorial Team. Read our editorial policy to see how we check facts and handle corrections.

Important

Our tools give estimates for general information only and are not financial, tax or legal advice. See our terms of use.

Get in touch

Questions, corrections or ideas for new calculators: contact us.