About Calclens
Calclens is an independent UK project building calculators that go one step further than the rest of the web — every result comes with a plain-English explanation, generated on demand by an AI model.
Why Calclens exists
Most calculators online give you a number and stop. You type in a house price, get a monthly payment, and that’s it. Whether that number is high, low, normal for your situation, or worth acting on — you have to figure out yourself.
Calclens was built because the numbers that matter most in your life — mortgage payments, tax bills, salary take-home, retirement projections — deserve more than a four-digit answer and a hyperlink to refresh the page. The calculation is the start of the conversation, not the end.
What we do differently
Every calculator uses current HMRC, FCA and Bank of England data. SDLT for England, LTT for Wales, LBTT for Scotland. Scottish income tax bands where relevant. Class 2 plus Class 4 NI for self-employed. No generic global maths.
After every calculation, you can ask for a plain-English explanation of what the number means in UK context, plus what would change if you adjusted one input. Powered by Claude, an AI model from Anthropic.
No sign-up, no accounts, no display ads, no affiliate links to lenders, brokers or accountants. Your numbers stay in your browser unless you ask for an AI explanation.
Formulas come from authoritative UK sources — HMRC, gov.uk, the Bank of England, MoneyHelper, FCA — and are documented openly on our methodology page.
How we make money
We don’t, yet. Calclens is currently a self-funded project — the calculators are free to use, with no ads or affiliate links of any kind. Over time we may add an optional paid feature for in-depth personalised reports, but the core calculators will always be free and ad-free.
Who’s behind it
Calclens is a small UK-based independent project. We’re not a regulated financial firm, an accountancy, a comparison site, or a price-aggregator. We don’t sell mortgages, savings products, pensions, or insurance — and we never will. We’re builders who think UK money calculators should be honest, accurate and useful in a way the current generation isn’t.