Free Online Calculators for the UK
Specialist calculators for every need — from mortgages to BMI, built for the UK market. 100% free, with instant, accurate results.
Fun & Quirky Calculators
Because not everything needs to be serious.
Meal Prep vs Eating Out Savings
See how much you could save each year by meal prepping instead of eating out.
Sunday Roast to Burpees Converter
Find out how many burpees it takes to burn off a Sunday roast.
Height in Double-Decker Buses
Convert your height into double-decker buses stacked on top of each other.
Time Left With Parents Calculator
A thought-provoking estimate of how much time you may have left with your parents.
Greggs Sausage Roll Inflation Tracker
Track how sausage roll prices have crept up over the years.
Beatles Discography Duration
Find out how long it takes to listen to the entire Beatles discography.
Harry Potter Reading Time Estimator
Estimate how long it takes to read the whole Harry Potter series.
Royal Family Wealth Comparison
Compare your savings to the wealth of the Royal Family, just for fun.
Wedding Cost vs House Deposit
Compare the average UK wedding cost to a house deposit.
Netflix Binge Time Calculator
Work out how long it would take to binge your favourite show.
Popular calculators
The tools UK users reach for most.
Mortgage Repayment Calculator
Work out your monthly mortgage payments and total interest over your term.
UK Salary Take-Home Calculator
Estimate your take-home pay after Income Tax and National Insurance.
BMI Calculator
Calculate your Body Mass Index using metric or imperial units.
VAT Calculator
Add or remove UK VAT from any price in seconds.
Percentage Calculator
Find a percentage of a number, work out percentage change and more.
Loan Repayment Calculator
Calculate monthly repayments and total interest on any personal loan.
Compound Interest Calculator
See how your savings or investments grow over time with compounding.
Concrete Mix Calculator
Work out cement, sand, aggregate and bag quantities for a pour.
Browse by category
Find the right calculator faster with our nine core categories.
Education
7 calculatorsSchool years, grades & costs
- UK School Year Checker
- University Degree Classification
- Childcare Cost
- Term-Time Only Salary
- UCAS Tariff Points
Browse by topic
What's new
Recently added calculators, updated regularly.
Free online calculators built for the UK
Pro Calculator UK is a free collection of over 80 online calculators built specifically around UK units, rates and conventions. Most calculator sites are written for a US audience, so they default to pounds-only body weight, US gallons, US tax rules and dollar amounts — which quietly produces the wrong answer if you are in Britain. Every tool here starts from the UK convention instead.
That means weight conversions handle stone and pounds the way people in the UK actually say them, volume tools use the imperial pint (568ml) rather than the smaller US pint (473ml), fuel economy uses UK gallons, and the finance calculators work in pounds sterling against current UK bands and thresholds.
Every calculator runs entirely in your browser. Nothing is uploaded, nothing is stored, and no sign-up is required — so you can check a figure and close the tab without leaving anything behind. The tools are grouped into finance, health and fitness, construction, automotive, education, maths, science and time, and you can search the full library by keyword at any time.
Frequently asked questions
Are these UK calculators free to use?
Yes. Every calculator on Pro Calculator UK is completely free, with no usage limits. There is no sign-up, no account, and no paywall on any tool.
Do I need to download or install anything?
No. Every calculator runs directly in your browser, so there is nothing to install. The calculations happen on your own device, which means your figures are never sent to a server.
What makes these calculators UK-specific?
They use UK units, UK rates and UK conventions by default — stone and pounds for body weight, miles for distance, imperial pints and gallons, pounds sterling for money, and UK tax bands and thresholds where relevant. Most general calculator sites default to US settings, which quietly gives the wrong answer for UK users.
How many calculators are there?
There are over 80 calculators across finance, health and fitness, construction, automotive, education, maths, science and time. New tools are added every month.
How accurate are the results?
Unit conversions use exact, internationally defined factors, so those results are precise rather than estimates. Cost and tax calculators use published UK figures and are intended as guidance — always confirm important financial decisions with a qualified professional.
Do the calculators work on mobile?
Yes. Every calculator is built to work on phones, tablets and desktop, and the layout adapts to whatever screen you are using.
Can't find the calculator you need?
Browse the full library or search by keyword — new tools are added every month.
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