Built for the UK · Updated for 2026/27
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
Six 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.
What people say
“Worked out our stamp duty in under a minute before we made an offer. Simple and clear.”
“Finally a take-home pay calculator that accounts for my student loan plan properly.”
“Clean, quick, and it doesn't try to sell me a mortgage broker every five seconds.”