Built for people who just want a straight answer
Calculatorz is a free UK calculator site covering personal finance, tax, mortgages, health, everyday maths and more. No accounts. No upsells. No fluff — just the numbers you need.
Why we built Calculatorz
Too many financial tools online are either locked behind an account wall, buried under adverts trying to sell you a product, or built for a US audience with no relevance to UK tax rates, thresholds or legislation.
We built Calculatorz to be the opposite: fast, free and honest. Every calculator runs entirely in your browser — nothing you type is sent anywhere. There are no cookies beyond basic analytics (which you can turn off in Cookie Settings), and there's no financial product attached to any result we show you.
The goal is simple: give you a clear, useful number in under 30 seconds, every time.
Built for the UK
Every calculator uses current UK tax rates, HMRC thresholds, National Insurance bands and legislation — not generic formulas that don't apply here.
No account needed
Open a calculator, enter your numbers, get your answer. Nothing to sign up for, no email address required, ever.
Your data stays with you
All calculations happen in your browser. We never see, store or log anything you type into our tools.
Estimates, clearly labelled
We're always upfront: our results are estimates to help you think, not regulated advice. We tell you what assumptions we've made so you can judge for yourself.
What we cover
Calculatorz is organised into topic hubs so you can find what you need quickly. Here's where to start:
How we keep tools accurate
We update our calculators when UK tax rates and thresholds change — typically after each Autumn Budget and Spring Statement. Each tool includes the tax year or data source it's based on so you always know how current the figures are.
If you spot an error or think something is out of date, please let us know — we take accuracy seriously and act on every report we receive.
A note on advice
Calculatorz is not a regulated financial adviser and nothing on this site constitutes financial, tax or legal advice. Our tools produce estimates to help you understand your situation — before making any significant financial decision, we always recommend speaking with a qualified professional.
We don't earn referral fees, we don't recommend specific products, and we're not trying to sell you anything. The site is funded through display advertising, which means our incentive is simply to build tools people find genuinely useful.
Find the right calculator
Over 100 free UK calculators — search by topic or browse all tools.
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Found a bug? Want to suggest a calculator? Have a question about how a result is calculated? We read everything and aim to reply within 2 working days.