UK calculators that get straight to the answer
Mortgage, stamp duty, take-home pay, road tax, BMI and more — free, fast, and built specifically around UK rules. No sign-up required.
Browse by category
Ten categories, one home for every UK calculation you need.
Featured calculators
The tools people reach for most.
Why Calculio
We built the calculator hub we wished existed — quick, honest, and made for people living in the UK.
Built for the UK
Every calculator uses UK-specific rules — HMRC tax bands, DVLA road tax, NHS BMI categories — not generic US maths.
Fast by design
Every page is pre-built and served instantly. No spinners, no waiting — just answers.
No sign-up, no tracking forms
Use any calculator instantly. We don't ask for your email or personal details to see a result.
Clear, honest numbers
We show our working — formulas and worked examples, not just a black-box result.
About Calculio
Calculio is a free calculator hub built for people living in the UK. Every tool on the site uses UK rules from the ground up, including HMRC income tax bands, DVLA vehicle tax rates and NHS health guidance, rather than a generic calculator with the currency symbol changed. There is no sign-up wall and no paywall. Type in your numbers and get an answer straight away.
We cover ten categories, from tax and mortgages to motoring, health, business and pets. Alongside each calculator, you will find a plain English explanation of the formula, a worked example using real UK numbers, and answers to the questions people ask most. Where a topic goes deeper than one calculator can cover, our blog looks at UK money and property questions in more detail.
Every calculator and guide on Calculio is written for general information only, not personal financial, tax, medical or legal advice. For any decision with real consequences, we always recommend speaking to a suitably qualified professional, such as an FCA-regulated adviser, an accountant, a solicitor or your GP. Read more about how we work on our About page.
From the blog
In-depth UK money and property guides to go with the numbers.